Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..111w&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 1, Aug. 1982, p. 111-115. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
56
Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Stellar Spectra, Variable Stars, High Resolution, Line Spectra, Spectrum Analysis, Stellar Luminosity
Scientific paper
High dispersion spectroscopy of the luminous variable star AG Car was carried out during maximum phase. The spectrum shows A-type star characteristics although all the lines exhibit P Cygni-type profiles with an intense emission, indicating that AG Car is surrounded by a dense expanding envelope during the maximum phase. The mean expansion velocity of the envelope is about -95 km/s and the estimated mass-loss rate is about 0.00003 solar mass/yr. A comparison with S Dor shows that the maximum spectra of both stars are very much alike. It is confirmed that AG Car belongs to the class of S Dor variables. AG Car and S Dor very likely represent similar short-lived post main sequence evolutionary stages of massive stars characterized by enhanced mass-loss. The most significant difference between both objects seems to be the luminosity. AG Car appears to be about five times less luminous and two times less massive than S Dor.
Stahl Otmar
Wolf Bernd
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