Get quick answers to your questions about the article from our AI researcher chatbot
{'id': 'https://openalex.org/W2594568668', 'doi': 'https://doi.org/10.1051/0004-6361/200911710', 'title': 'Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b)', 'display_name': 'Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b)', 'publication_year': 2009, 'publication_date': '2009-03-11', 'ids': {'openalex': 'https://openalex.org/W2594568668', 'doi': 'https://doi.org/10.1051/0004-6361/200911710', 'mag': '2594568668'}, 'language': 'en', 'primary_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1051/0004-6361/200911710', 'pdf_url': 'https://www.aanda.org/articles/aa/pdf/2009/13/aa11710-09.pdf', 'source': {'id': 'https://openalex.org/S205231332', 'display_name': 'Astronomy and Astrophysics', 'issn_l': '0004-6361', 'issn': ['0004-6361', '1432-0746'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310319748', 'host_organization_name': 'EDP Sciences', 'host_organization_lineage': ['https://openalex.org/P4310319748'], 'host_organization_lineage_names': ['EDP Sciences'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'type': 'article', 'type_crossref': 'journal-article', 'indexed_in': ['crossref', 'datacite'], 'open_access': {'is_oa': True, 'oa_status': 'bronze', 'oa_url': 'https://www.aanda.org/articles/aa/pdf/2009/13/aa11710-09.pdf', 'any_repository_has_fulltext': True}, 'authorships': [{'author_position': 'first', 'author': {'id': 'https://openalex.org/A5063761763', 'display_name': 'A. Ibarra', 'orcid': 'https://orcid.org/0000-0003-0970-4947'}, 'institutions': [{'id': 'https://openalex.org/I2801994115', 'display_name': 'European Space Agency', 'ror': 'https://ror.org/03wd9za21', 'country_code': 'FR', 'type': 'nonprofit', 'lineage': ['https://openalex.org/I2801994115']}], 'countries': ['FR'], 'is_corresponding': False, 'raw_author_name': 'A. Ibarra', 'raw_affiliation_strings': ['ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)'], 'affiliations': [{'raw_affiliation_string': 'ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)', 'institution_ids': ['https://openalex.org/I2801994115']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5023584585', 'display_name': 'E. Kuulkers', 'orcid': 'https://orcid.org/0000-0002-5790-7290'}, 'institutions': [{'id': 'https://openalex.org/I4210093174', 'display_name': 'European Space Astronomy Centre', 'ror': 'https://ror.org/00kw1sm04', 'country_code': 'ES', 'type': 'government', 'lineage': ['https://openalex.org/I2801994115', 'https://openalex.org/I4210093174']}], 'countries': ['ES'], 'is_corresponding': False, 'raw_author_name': 'E. Kuulkers', 'raw_affiliation_strings': ['ESAC - European Space Astronomy Centre (Camino bajo del Castillo, s/n, Urbanización Villafranca del Castillo,, Villanueva de la Cañada, E-28692 Madrid\r\n - Spain)'], 'affiliations': [{'raw_affiliation_string': 'ESAC - European Space Astronomy Centre (Camino bajo del Castillo, s/n, Urbanización Villafranca del Castillo,, Villanueva de la Cañada, E-28692 Madrid\r\n - Spain)', 'institution_ids': ['https://openalex.org/I4210093174']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5054584804', 'display_name': 'J. P. Osborne', 'orcid': 'https://orcid.org/0000-0002-1041-7542'}, 'institutions': [{'id': 'https://openalex.org/I153648349', 'display_name': 'University of Leicester', 'ror': 'https://ror.org/04h699437', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I153648349']}], 'countries': ['GB'], 'is_corresponding': False, 'raw_author_name': 'J. P. Osborne', 'raw_affiliation_strings': ['Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)'], 'affiliations': [{'raw_affiliation_string': 'Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)', 'institution_ids': ['https://openalex.org/I153648349']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5060680432', 'display_name': 'K. L. Page', 'orcid': 'https://orcid.org/0000-0001-5624-2613'}, 'institutions': [{'id': 'https://openalex.org/I153648349', 'display_name': 'University of Leicester', 'ror': 'https://ror.org/04h699437', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I153648349']}], 'countries': ['GB'], 'is_corresponding': False, 'raw_author_name': 'K. Page', 'raw_affiliation_strings': ['Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)'], 'affiliations': [{'raw_affiliation_string': 'Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)', 'institution_ids': ['https://openalex.org/I153648349']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5045660438', 'display_name': 'J. U. Ness', 'orcid': 'https://orcid.org/0000-0003-0440-7193'}, 'institutions': [{'id': 'https://openalex.org/I2801994115', 'display_name': 'European Space Agency', 'ror': 'https://ror.org/03wd9za21', 'country_code': 'FR', 'type': 'nonprofit', 'lineage': ['https://openalex.org/I2801994115']}], 'countries': ['FR'], 'is_corresponding': False, 'raw_author_name': 'J. U. Ness', 'raw_affiliation_strings': ['ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)'], 'affiliations': [{'raw_affiliation_string': 'ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)', 'institution_ids': ['https://openalex.org/I2801994115']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5068534221', 'display_name': 'R. D. Saxton', 'orcid': 'https://orcid.org/0000-0002-4912-2477'}, 'institutions': [{'id': 'https://openalex.org/I2801994115', 'display_name': 'European Space Agency', 'ror': 'https://ror.org/03wd9za21', 'country_code': 'FR', 'type': 'nonprofit', 'lineage': ['https://openalex.org/I2801994115']}], 'countries': ['FR'], 'is_corresponding': False, 'raw_author_name': 'R. D. Saxton', 'raw_affiliation_strings': ['ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)'], 'affiliations': [{'raw_affiliation_string': 'ESA - Agence Spatiale Européenne = European Space Agency (Agence spatiale européenne (ESA) 8-10, rue Mario Nikis F-75015 Paris - France)', 'institution_ids': ['https://openalex.org/I2801994115']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5031941627', 'display_name': 'W. H. Baumgartner', 'orcid': 'https://orcid.org/0000-0002-5106-0463'}, 'institutions': [{'id': 'https://openalex.org/I1306266525', 'display_name': 'Goddard Space Flight Center', 'ror': 'https://ror.org/0171mag52', 'country_code': 'US', 'type': 'facility', 'lineage': ['https://openalex.org/I1306266525', 'https://openalex.org/I4210124779']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'W. Baumgartner', 'raw_affiliation_strings': ['GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)'], 'affiliations': [{'raw_affiliation_string': 'GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)', 'institution_ids': ['https://openalex.org/I1306266525']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5062033341', 'display_name': 'V. Beckmann', 'orcid': 'https://orcid.org/0000-0002-2778-8569'}, 'institutions': [{'id': 'https://openalex.org/I2802090066', 'display_name': 'Laboratoire AstroParticule et Cosmologie', 'ror': 'https://ror.org/03tnjrr49', 'country_code': 'FR', 'type': 'facility', 'lineage': ['https://openalex.org/I1294671590', 'https://openalex.org/I204730241', 'https://openalex.org/I2738703131', 'https://openalex.org/I2799535048', 'https://openalex.org/I2800004676', 'https://openalex.org/I2802090066', 'https://openalex.org/I4210133362']}, {'id': 'https://openalex.org/I114457229', 'display_name': 'University of Geneva', 'ror': 'https://ror.org/01swzsf04', 'country_code': 'CH', 'type': 'education', 'lineage': ['https://openalex.org/I114457229']}, {'id': 'https://openalex.org/I204730241', 'display_name': 'Université Paris Cité', 'ror': 'https://ror.org/05f82e368', 'country_code': 'FR', 'type': 'education', 'lineage': ['https://openalex.org/I204730241']}], 'countries': ['CH', 'FR'], 'is_corresponding': False, 'raw_author_name': 'V. Beckmann', 'raw_affiliation_strings': ['APC (UMR_7164) - AstroParticule et Cosmologie (APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13 - France)', 'UNIGE - Université de Genève = University of Geneva (24 rue du Général-Dufour CH - 1211 Genève 4\r\nSuisse - Switzerland)'], 'affiliations': [{'raw_affiliation_string': 'APC (UMR_7164) - AstroParticule et Cosmologie (APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13 - France)', 'institution_ids': ['https://openalex.org/I2802090066', 'https://openalex.org/I204730241']}, {'raw_affiliation_string': 'UNIGE - Université de Genève = University of Geneva (24 rue du Général-Dufour CH - 1211 Genève 4\r\nSuisse - Switzerland)', 'institution_ids': ['https://openalex.org/I114457229']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5101467964', 'display_name': 'M. F. Bode', 'orcid': 'https://orcid.org/0000-0003-4557-4780'}, 'institutions': [], 'countries': ['GB'], 'is_corresponding': False, 'raw_author_name': 'M. F. Bode', 'raw_affiliation_strings': ['ARI - Astrophysics Research Institute [Liverpool] (146 Brownlow Hill, Liverpool L3 5RF\r\n - United Kingdom)'], 'affiliations': [{'raw_affiliation_string': 'ARI - Astrophysics Research Institute [Liverpool] (146 Brownlow Hill, Liverpool L3 5RF\r\n - United Kingdom)', 'institution_ids': []}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5052773461', 'display_name': 'M. Hernanz', 'orcid': 'https://orcid.org/0000-0002-8651-7910'}, 'institutions': [{'id': 'https://openalex.org/I1306266525', 'display_name': 'Goddard Space Flight Center', 'ror': 'https://ror.org/0171mag52', 'country_code': 'US', 'type': 'facility', 'lineage': ['https://openalex.org/I1306266525', 'https://openalex.org/I4210124779']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'M. Hernanz', 'raw_affiliation_strings': ['GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)'], 'affiliations': [{'raw_affiliation_string': 'GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)', 'institution_ids': ['https://openalex.org/I1306266525']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5020193574', 'display_name': 'K. Mukai', 'orcid': 'https://orcid.org/0000-0002-8286-8094'}, 'institutions': [{'id': 'https://openalex.org/I1306266525', 'display_name': 'Goddard Space Flight Center', 'ror': 'https://ror.org/0171mag52', 'country_code': 'US', 'type': 'facility', 'lineage': ['https://openalex.org/I1306266525', 'https://openalex.org/I4210124779']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'K. Mukai', 'raw_affiliation_strings': ['GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)'], 'affiliations': [{'raw_affiliation_string': 'GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)', 'institution_ids': ['https://openalex.org/I1306266525']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5042089480', 'display_name': 'Marina Orio', 'orcid': 'https://orcid.org/0000-0003-1563-9803'}, 'institutions': [{'id': 'https://openalex.org/I4210159647', 'display_name': 'Osservatorio Astronomico di Padova', 'ror': 'https://ror.org/04z3y3f62', 'country_code': 'IT', 'type': 'facility', 'lineage': ['https://openalex.org/I4210159647', 'https://openalex.org/I875825670']}, {'id': 'https://openalex.org/I135310074', 'display_name': 'University of Wisconsin–Madison', 'ror': 'https://ror.org/01y2jtd41', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I135310074']}], 'countries': ['IT', 'US'], 'is_corresponding': False, 'raw_author_name': 'M. Orio', 'raw_affiliation_strings': ['Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison WI 53706, USA', 'INAF – Osservatorio Astronomico di Padova, vicolo Osservatorio 5, 35122 Padova, Italy'], 'affiliations': [{'raw_affiliation_string': 'INAF – Osservatorio Astronomico di Padova, vicolo Osservatorio 5, 35122 Padova, Italy', 'institution_ids': ['https://openalex.org/I4210159647']}, {'raw_affiliation_string': 'Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison WI 53706, USA', 'institution_ids': ['https://openalex.org/I135310074']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5023061467', 'display_name': 'G. Sala', 'orcid': 'https://orcid.org/0000-0001-6211-8299'}, 'institutions': [{'id': 'https://openalex.org/I9617848', 'display_name': 'Universitat Politècnica de Catalunya', 'ror': 'https://ror.org/03mb6wj31', 'country_code': 'ES', 'type': 'education', 'lineage': ['https://openalex.org/I9617848']}], 'countries': ['ES'], 'is_corresponding': False, 'raw_author_name': 'G. Sala', 'raw_affiliation_strings': ['UPC - Universitat Politècnica de Catalunya = Université polytechnique de Catalogne [Barcelona] (C./Jordi Girona, 1-3, 08034 Barcelona - Spain)'], 'affiliations': [{'raw_affiliation_string': 'UPC - Universitat Politècnica de Catalunya = Université polytechnique de Catalogne [Barcelona] (C./Jordi Girona, 1-3, 08034 Barcelona - Spain)', 'institution_ids': ['https://openalex.org/I9617848']}]}, {'author_position': 'middle', 'author': {'id': 'https://openalex.org/A5059881794', 'display_name': 'S. Starrfield', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I138006243', 'display_name': 'University of Arizona', 'ror': 'https://ror.org/03m2x1q45', 'country_code': 'US', 'type': 'education', 'lineage': ['https://openalex.org/I138006243']}], 'countries': ['US'], 'is_corresponding': False, 'raw_author_name': 'S. Starrfield', 'raw_affiliation_strings': ['University of Arizona (Tucson AZ 85721 USA - United States)'], 'affiliations': [{'raw_affiliation_string': 'University of Arizona (Tucson AZ 85721 USA - United States)', 'institution_ids': ['https://openalex.org/I138006243']}]}, {'author_position': 'last', 'author': {'id': 'https://openalex.org/A5078305437', 'display_name': 'G. A. Wynn', 'orcid': None}, 'institutions': [{'id': 'https://openalex.org/I153648349', 'display_name': 'University of Leicester', 'ror': 'https://ror.org/04h699437', 'country_code': 'GB', 'type': 'education', 'lineage': ['https://openalex.org/I153648349']}], 'countries': ['GB'], 'is_corresponding': False, 'raw_author_name': 'G. A. Wynn', 'raw_affiliation_strings': ['Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)'], 'affiliations': [{'raw_affiliation_string': 'Department of Physics and Astronomy [Leicester] (University of Leicester, University Road, Leicester, LE1 7RH, - United Kingdom)', 'institution_ids': ['https://openalex.org/I153648349']}]}], 'institution_assertions': [], 'countries_distinct_count': 6, 'institutions_distinct_count': 11, 'corresponding_author_ids': [], 'corresponding_institution_ids': [], 'apc_list': None, 'apc_paid': None, 'fwci': 1.654, 'has_fulltext': False, 'cited_by_count': 21, 'citation_normalized_percentile': {'value': 0.753877, 'is_in_top_1_percent': False, 'is_in_top_10_percent': False}, 'cited_by_percentile_year': {'min': 89, 'max': 90}, 'biblio': {'volume': '497', 'issue': '1', 'first_page': 'L5', 'last_page': 'L8'}, 'is_retracted': False, 'is_paratext': False, 'primary_topic': {'id': 'https://openalex.org/T10744', 'display_name': 'Astrophysical Studies of Black Holes', 'score': 0.9995, 'subfield': {'id': 'https://openalex.org/subfields/3103', 'display_name': 'Astronomy and Astrophysics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, 'topics': [{'id': 'https://openalex.org/T10744', 'display_name': 'Astrophysical Studies of Black Holes', 'score': 0.9995, 'subfield': {'id': 'https://openalex.org/subfields/3103', 'display_name': 'Astronomy and Astrophysics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T10384', 'display_name': 'Laser-Plasma Interactions and Particle Acceleration', 'score': 0.9585, 'subfield': {'id': 'https://openalex.org/subfields/3106', 'display_name': 'Nuclear and High Energy Physics'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}, {'id': 'https://openalex.org/T11183', 'display_name': 'X-ray Imaging Techniques and Applications', 'score': 0.9444, 'subfield': {'id': 'https://openalex.org/subfields/3108', 'display_name': 'Radiation'}, 'field': {'id': 'https://openalex.org/fields/31', 'display_name': 'Physics and Astronomy'}, 'domain': {'id': 'https://openalex.org/domains/3', 'display_name': 'Physical Sciences'}}], 'keywords': [{'id': 'https://openalex.org/keywords/nova', 'display_name': 'Nova (rocket)', 'score': 0.9480262}, {'id': 'https://openalex.org/keywords/rosat', 'display_name': 'ROSAT', 'score': 0.8590753}, {'id': 'https://openalex.org/keywords/cataclysmic-variable-star', 'display_name': 'Cataclysmic variable star', 'score': 0.6175667}, {'id': 'https://openalex.org/keywords/dwarf-nova', 'display_name': 'Dwarf nova', 'score': 0.5432514}, {'id': 'https://openalex.org/keywords/soft-x-ray-microscopy', 'display_name': 'Soft X-ray Microscopy', 'score': 0.442645}], 'concepts': [{'id': 'https://openalex.org/C199364081', 'wikidata': 'https://www.wikidata.org/wiki/Q183158', 'display_name': 'Nova (rocket)', 'level': 2, 'score': 0.9480262}, {'id': 'https://openalex.org/C121332964', 'wikidata': 'https://www.wikidata.org/wiki/Q413', 'display_name': 'Physics', 'level': 0, 'score': 0.8920728}, {'id': 'https://openalex.org/C44870925', 'wikidata': 'https://www.wikidata.org/wiki/Q37547', 'display_name': 'Astrophysics', 'level': 1, 'score': 0.8879709}, {'id': 'https://openalex.org/C75776270', 'wikidata': 'https://www.wikidata.org/wiki/Q54284', 'display_name': 'ROSAT', 'level': 3, 'score': 0.8590753}, {'id': 'https://openalex.org/C197445014', 'wikidata': 'https://www.wikidata.org/wiki/Q5871', 'display_name': 'White dwarf', 'level': 3, 'score': 0.792273}, {'id': 'https://openalex.org/C196778148', 'wikidata': 'https://www.wikidata.org/wiki/Q1059564', 'display_name': 'Cataclysmic variable star', 'level': 4, 'score': 0.6175667}, {'id': 'https://openalex.org/C130726490', 'wikidata': 'https://www.wikidata.org/wiki/Q675076', 'display_name': 'Light curve', 'level': 2, 'score': 0.54772866}, {'id': 'https://openalex.org/C2775961173', 'wikidata': 'https://www.wikidata.org/wiki/Q244264', 'display_name': 'Dwarf nova', 'level': 4, 'score': 0.5432514}, {'id': 'https://openalex.org/C1276947', 'wikidata': 'https://www.wikidata.org/wiki/Q333', 'display_name': 'Astronomy', 'level': 1, 'score': 0.4607007}, {'id': 'https://openalex.org/C2779328170', 'wikidata': 'https://www.wikidata.org/wiki/Q34777', 'display_name': 'X-ray', 'level': 2, 'score': 0.4142781}, {'id': 'https://openalex.org/C150846664', 'wikidata': 'https://www.wikidata.org/wiki/Q7602306', 'display_name': 'Stars', 'level': 2, 'score': 0.20797747}, {'id': 'https://openalex.org/C98444146', 'wikidata': 'https://www.wikidata.org/wiki/Q318', 'display_name': 'Galaxy', 'level': 2, 'score': 0.103049695}, {'id': 'https://openalex.org/C120665830', 'wikidata': 'https://www.wikidata.org/wiki/Q14620', 'display_name': 'Optics', 'level': 1, 'score': 0.055924654}, {'id': 'https://openalex.org/C178802073', 'wikidata': 'https://www.wikidata.org/wiki/Q8421', 'display_name': 'Aeronautics', 'level': 1, 'score': 0.0}, {'id': 'https://openalex.org/C127413603', 'wikidata': 'https://www.wikidata.org/wiki/Q11023', 'display_name': 'Engineering', 'level': 0, 'score': 0.0}], 'mesh': [], 'locations_count': 5, 'locations': [{'is_oa': True, 'landing_page_url': 'https://doi.org/10.1051/0004-6361/200911710', 'pdf_url': 'https://www.aanda.org/articles/aa/pdf/2009/13/aa11710-09.pdf', 'source': {'id': 'https://openalex.org/S205231332', 'display_name': 'Astronomy and Astrophysics', 'issn_l': '0004-6361', 'issn': ['0004-6361', '1432-0746'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310319748', 'host_organization_name': 'EDP Sciences', 'host_organization_lineage': ['https://openalex.org/P4310319748'], 'host_organization_lineage_names': ['EDP Sciences'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, {'is_oa': False, 'landing_page_url': 'https://hal.archives-ouvertes.fr/hal-00728355', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306402512', 'display_name': 'HAL (Le Centre pour la Communication Scientifique Directe)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1294671590', 'host_organization_name': 'Centre National de la Recherche Scientifique', 'host_organization_lineage': ['https://openalex.org/I1294671590'], 'host_organization_lineage_names': ['Centre National de la Recherche Scientifique'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, {'is_oa': False, 'landing_page_url': 'https://hal.science/hal-00728355', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4306402512', 'display_name': 'HAL (Le Centre pour la Communication Scientifique Directe)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I1294671590', 'host_organization_name': 'Centre National de la Recherche Scientifique', 'host_organization_lineage': ['https://openalex.org/I1294671590'], 'host_organization_lineage_names': ['Centre National de la Recherche Scientifique'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': None, 'is_accepted': False, 'is_published': False}, {'is_oa': True, 'landing_page_url': 'https://www.aanda.org/10.1051/0004-6361/200911710/pdf', 'pdf_url': 'https://www.aanda.org/10.1051/0004-6361/200911710/pdf', 'source': {'id': 'https://openalex.org/S4306400744', 'display_name': 'Springer Link (Chiba Institute of Technology)', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I8488066', 'host_organization_name': 'Chiba Institute of Technology', 'host_organization_lineage': ['https://openalex.org/I8488066'], 'host_organization_lineage_names': ['Chiba Institute of Technology'], 'type': 'repository'}, 'license': None, 'license_id': None, 'version': 'submittedVersion', 'is_accepted': False, 'is_published': False}, {'is_oa': False, 'landing_page_url': 'https://api.datacite.org/dois/10.48550/arxiv.0902.3943', 'pdf_url': None, 'source': {'id': 'https://openalex.org/S4393179698', 'display_name': 'DataCite API', 'issn_l': None, 'issn': None, 'is_oa': True, 'is_in_doaj': False, 'is_core': False, 'host_organization': 'https://openalex.org/I4210145204', 'host_organization_name': 'DataCite', 'host_organization_lineage': ['https://openalex.org/I4210145204'], 'host_organization_lineage_names': ['DataCite'], 'type': 'metadata'}, 'license': None, 'license_id': None, 'version': None}], 'best_oa_location': {'is_oa': True, 'landing_page_url': 'https://doi.org/10.1051/0004-6361/200911710', 'pdf_url': 'https://www.aanda.org/articles/aa/pdf/2009/13/aa11710-09.pdf', 'source': {'id': 'https://openalex.org/S205231332', 'display_name': 'Astronomy and Astrophysics', 'issn_l': '0004-6361', 'issn': ['0004-6361', '1432-0746'], 'is_oa': False, 'is_in_doaj': False, 'is_core': True, 'host_organization': 'https://openalex.org/P4310319748', 'host_organization_name': 'EDP Sciences', 'host_organization_lineage': ['https://openalex.org/P4310319748'], 'host_organization_lineage_names': ['EDP Sciences'], 'type': 'journal'}, 'license': None, 'license_id': None, 'version': 'publishedVersion', 'is_accepted': True, 'is_published': True}, 'sustainable_development_goals': [], 'grants': [], 'datasets': [], 'versions': ['https://openalex.org/W2594568668', 'https://openalex.org/W3123320584'], 'referenced_works_count': 26, 'referenced_works': ['https://openalex.org/W1485073943', 'https://openalex.org/W1977694174', 'https://openalex.org/W2006278087', 'https://openalex.org/W2022862485', 'https://openalex.org/W2032862735', 'https://openalex.org/W2036006391', 'https://openalex.org/W2039147279', 'https://openalex.org/W2073869758', 'https://openalex.org/W2076263844', 'https://openalex.org/W2084918144', 'https://openalex.org/W2087108072', 'https://openalex.org/W2108091691', 'https://openalex.org/W2117735710', 'https://openalex.org/W2131101867', 'https://openalex.org/W2149024781', 'https://openalex.org/W2154078330', 'https://openalex.org/W2158231162', 'https://openalex.org/W2313192801', 'https://openalex.org/W2950307153', 'https://openalex.org/W3098536862', 'https://openalex.org/W3099689618', 'https://openalex.org/W3101540148', 'https://openalex.org/W3102033255', 'https://openalex.org/W3123440583', 'https://openalex.org/W4237805057', 'https://openalex.org/W622390247'], 'related_works': ['https://openalex.org/W834290642', 'https://openalex.org/W4282919116', 'https://openalex.org/W3144177538', 'https://openalex.org/W3101472282', 'https://openalex.org/W2153885564', 'https://openalex.org/W2092254545', 'https://openalex.org/W2077716185', 'https://openalex.org/W2075033996', 'https://openalex.org/W2002106244', 'https://openalex.org/W1488598255'], 'abstract_inverted_index': {'Classical': [0], 'novae': [1, 43], 'are': [2], 'phenomena': [3], 'caused': [4], 'by': [5], 'explosive': [6], 'hydrogen': [7], 'burning': [8], 'onto': [9], 'an': [10], 'accreting': [11], 'white': [12], 'dwarf.': [13], 'Only': [14], 'one': [15, 38, 92], 'classical': [16], 'nova': [17], 'had': [18], 'been': [19], 'identified': [20], 'in': [21, 91], 'X-rays': [22], 'before': [23, 68], 'the': [24, 40, 69, 74], 'actual': [25], 'optical': [26, 70], 'outburst': [27], 'occurred': [28], '(V2487': [29], 'Oph).': [30], 'The': [31, 82], 'recently': [32], 'discovered': [33], 'nova,': [34], 'V2491': [35, 57], 'Cyg,': [36], 'is': [37, 86], 'of': [39], 'fastest': [41], '(He/N)': [42], 'observed': [44], 'to': [45], 'date.': [46], 'Using': [47], 'archival': [48], '<i>ROSAT<i/>,': [49], '<i>XMM-Newton<i/>,': [50], 'and': [51, 78], '<i>Swift<i/>': [52], 'data,': [53], 'we': [54], 'show': [55], 'that': [56], 'Cyg': [58], 'was': [59], 'a': [60, 96], 'persistent': [61], 'X-ray': [62, 75, 80, 84, 98], 'source': [63], 'during': [64], 'its': [65], 'quiescent': [66], 'time': [67], 'outburst.': [71], 'We': [72], 'present': [73], 'spectral': [76], 'characteristics': [77], 'derive': [79], 'fluxes.': [81], 'pre-outburst': [83], 'emission': [85], 'variable,': [87], 'and,': [88], 'at': [89], 'least': [90], 'observation,': [93], 'it': [94], 'exhibits': [95], 'soft': [97], 'source.': [99]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2594568668', 'counts_by_year': [{'year': 2022, 'cited_by_count': 1}, {'year': 2020, 'cited_by_count': 2}, {'year': 2018, 'cited_by_count': 2}, {'year': 2017, 'cited_by_count': 2}, {'year': 2015, 'cited_by_count': 3}], 'updated_date': '2024-09-25T23:14:33.277244', 'created_date': '2017-03-16'}