EDP Sciences
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Volume 412, Number 1, December II 2003
Page(s) 219 - 228
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031416

A&A 412, 219-228 (2003)
DOI: 10.1051/0004-6361:20031416

HD 19993 and HD 29035: New bright A-type emission-line stars

A. S. Miroshnichenko1, 2, A. V. Kusakin3, 4, K. S. Bjorkman1, N. A. Drake5, 6, R. J. Rudy7, D. K. Lynch7, S. Mazuk7, C. C. Venturini7, R. C. Puetter8 and R. B. Perry9

1  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

(Received 10 June 2003 / 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). 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 ( $T_{\rm eff} \sim 7500\pm200$ K, $\log g =2.7\pm0.2$, $v\,\sin i =35\pm2$ km s -1, $M=4.8\pm 0.8~M_{\odot}$) with a mild metal deficit ([Fe/H] $\sim -0.3\pm0.1$), while HD 29035 is a B9/A0 V star ( $T_{\rm eff} \sim10\,000$ K, $\log g \sim4$, $v\sin i \sim150$ 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.

Key words: techniques: spectroscopic -- techniques: photometric -- stars: circumstellar matter -- stars: individual: HD 19993, HD 29035

Offprint request: A. S. Miroshnichenko, anatoly@physics.utoledo.edu

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