Title: Circumstellar shells of luminous supergiants. I - Carbon monoxide in Rho Cassiopeiae and HR 8752
Abstract: view Abstract Citations (59) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Circumstellar shells of luminous supergiants. I. Carbon monoxide in rho CAS and HR 8752. Lambert, D. L. ; Hinkle, K. H. ; Hall, D. N. B. Abstract High resolution spectra are presented for the 2.3 micron, CO Delta-v = 2 region in the two F Ia supergiants HR 8752 and Rho Cas, which have extensive circumstellar shells without infrared excesses that indicate circumstellar gas with little dust. The new spectra show strong CO Delta-v = 2 lines of circumstellar origin at kinetic temperatures near 2000 K. The CO line profile in Rho Cas resembles that of the circumstellar component of atomic lines at shorter wavelengths, and a standard model with spherical symmetry and acceleration to the escape velocity gives a lower limit to the rate of mass loss of 0.01 solar masses/year. Infrared CO and visual circumstellar lines in HR 8752 show a progression of line profiles with time over the five-year interval 1975-1979, with the C-12/C-13 ratio being 15 and a photosphere pulsation period of nearly three years. Publication: The Astrophysical Journal Pub Date: September 1981 DOI: 10.1086/159189 Bibcode: 1981ApJ...248..638L Keywords: Carbon Monoxide; Infrared Stars; Stellar Envelopes; Stellar Mass Ejection; Stellar Spectra; Supergiant Stars; Atomic Spectra; F Stars; Infrared Astronomy; Line Spectra; Radial Velocity; Stellar Luminosity; Astrophysics full text sources ADS | data products SIMBAD (9)