Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...412..219m&link_type=abstract
Astronomy and Astrophysics, v.412, p.219-228 (2003)
Astronomy and Astrophysics
Astrophysics
4
Techniques: Spectroscopic, Techniques: Photometric, Stars: Circumstellar Matter, Stars: Individual: Hd 19993, Hd 29035
Scientific paper
We present the results of photometric and spectroscopic observations of two A-type stars (HD 19993 and HD 29035), optical counterparts of the IRAS sources (F03108+3729 and 04331+5211, respectively). Hα line emission is found in the optical spectra of both objects for the first time. Our analysis of the spectral line profiles and the photometric information shows that HD 19993 is an A7/8 II star (Teff ~7500+/-200 K, log g =2.7+/-0.2, v sin i =35+/-2 km s-1, M=4.8+/- 0.8 Msun ) with a mild metal deficit ([Fe/H] ~ -0.3+/-0.1), while HD 29035 is a B9/A0 V star (Teff ~10 000 K, log g ~ 4, vsin i ~ 150 km s-1). The presence of an IR excess and the Hα emission in combination with a very different location in the Hertzsprung-Russell diagram suggest the different nature and evolutionary stages of the objects. We conclude that HD 29035 is a candidate Herbig Ae type star, a possible member of a group of similar objects. HD 19993 seems to be a post-main-sequence object.
Bjorkman Karen S.
Drake Natalia A.
Kusakin Anatolij V.
Lynch David K.
Mazuk Stephan
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