THE SPECTRUM OF FG SGE IN 1994

Citation
T. Kipper et al., THE SPECTRUM OF FG SGE IN 1994, Astronomy and astrophysics, 297(2), 1995, pp. 33-36
Citations number
19
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046361
Volume
297
Issue
2
Year of publication
1995
Pages
33 - 36
Database
ISI
SICI code
0004-6361(1995)297:2<33:TSOFSI>2.0.ZU;2-9
Abstract
We describe the high-resolution spectra of FG Sagittae obtained in 199 4 during the current episode of the star's activity. The abundances of iron-peak and s-process elements have not changed compared to those o f the previous decade. The presence of carbon molecular bands is confi rmed and the carbon to oxygen abundance ratio is estimated to be C/O = 4.5. It is the first time the spectrum of FG Sge shows P Cygni like p rofiles of sodium D lines. From absorption components of these lines w e estimate the mass loss rate, M = 3 . 10(-7)M. yr(-1). From fast chan ges of emission intensity we conclude that FG Sge ejected a shell in J uly, 1994. These findings support the R CrB type model of FG Sge.