Volume 412, Number 1, December II 2003
|Page(s)||219 - 228|
|Section||Stellar structure and evolution|
|Published online||25 November 2003|
HD 19993 and HD 29035: New bright A-type emission-line stars
Ritter Observatory, Dept. of Physics & Astronomy, The University of Toledo, Toledo, OH 43606–3390, USA
2 Pulkovo Observatory, Saint-Petersburg, 196140, Russia
3 Sternberg Astronomical Institute, Universitetskij pr. 13, Moscow, 119899, Russia
4 Fesenkov Astrophysical Institute, Almaty, 480068, Kazakhstan
5 Observatório Nacional/MCT, Rua General José Cristino 77, São Cristovão, Rio de Janeiro, 20921-400, Brazil
6 Sobolev Astronomical Institute, St. Petersburg University, Universitetsky Pr. 28, Petrodvorets, St. Petersburg, 198504, Russia
7 The Aerospace Corp. M2/266, PO Box 92957, Los Angeles, CA 90009, USA
8 Center for Astrophysics and Space Science, University of California, San Diego, C–0111, La Jolla, CA 92093, USA
9 Earth and Space Science Support Office, M/S 160, NASA Langley Research Center, Hampton, VA 23681, USA
Corresponding author: A. S. Miroshnichenko, firstname.lastname@example.org
Accepted: 25 August 2003
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 ( K, , km s-1, ) with a mild metal deficit ([Fe/H] ), while HD 29035 is a B9/A0 v star ( K, , 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.
Key words: techniques: spectroscopic / techniques: photometric / stars: circumstellar matter / stars: individual: HD 19993, HD 29035
© ESO, 2003
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