Circumstellar CO in FG Sagittae

Details Circumstellar CO in FG Sagittae Circumstellar CO in FG Sagittae

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..808h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 2, p. 808-811

Astronomy and Astrophysics

Astronomy

9

Carbon Monoxide, Infrared Astronomy, Infrared Spectra, Line Spectra, R Coronae Borealis Stars, Stellar Envelopes, Astronomical Spectroscopy, Excitation, Sagittarius Constellation, Stellar Evolution, Temperature, Velocity

Scientific paper

High resolution spectroscopy at 2.3 micrometers of the remarkable variable FG Sge, taken in 1992 shortly before a sudden 3 mag visual extinction event, reveals CO lines originating in two circumstellar shells. One shell is at approximately the stellar velocity and has an excitation temperature of approximately 1800 K. The second is expanding at 21 km/s with an excitation temperature of approximately 900 K. The shells are at 2 and 11 R*, respectively. This renewed Asymptotic Giant Branch (AGB)-type mass loss appears to be part of the transformation of FG Sge into a R CrB star.

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