Title of article
HD 19993 and HD 29035: New bright A-type emission-line stars
Author/Authors
Bjorkman، K. S. نويسنده , , Mazuk، S. نويسنده , , Rudy، R. J. نويسنده , , Miroshnichenko، A. S. نويسنده , , Kusakin، A. V. نويسنده , , Drake، N. A. نويسنده , , D. K. Lynch، نويسنده , , C. C. Venturini، نويسنده , , R. C. Puetter، نويسنده , , R. B. Perry، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
-218
From page
219
To page
0
Abstract
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). H (alpha)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 ( … K, …, … km s -1, …) with a mild metal deficit ([Fe/H] ~ -0.3 +0.1), while HD 29035 is a B9/A0 V star ( … K, …, … km s -1). The presence of an IR excess and the H (alpha)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.
Keywords
techniques: spectroscopic , stars: circumstellar matter , stars: individual: HD 19993 , HD 29035 , techniques: photometric
Journal title
Astronomy and Astrophysics
Serial Year
2003
Journal title
Astronomy and Astrophysics
Record number
77297
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