Title: The Circumstellar Envelope of VX Sagittarii
Abstract: Radio maser emission from OH, H2O and SiO masers provides a means of studying the circumstellar envelopes of long period variable stars. The OH 1612 MHz maser emission arises in the cool outer layers of the envelopes at distances >101 6cm from the photosphere and is pumped by infrared photons (Elitzur 1982). The maser lines of the OH molecule at 1665/7 MHz and of H2O and SiO molecules are valuable probes of the warm inner regions of the envelopes. Only a few sources have been mapped in these lines and physical conditions in the inner regions of circumstellar envelopes are not well understood. For the luminous M-type supergiant star VX Sgr, we have made MERLIN observations of the OH maser emission at 1612 MHz (LHC) and 1665/7 MHz (RHC) and the H2O maser emission at 22 GHz (LHC). These have been combined with published data on the SiO masers (Lane 1984) to give a detailed description of the circumstellar envelope.
Publication Year: 1986
Publication Date: 1986-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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