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

А. С. Мирошниченко, Anatolij V. Kusakin, K. S. Bjorkman, Natalia A. Drake, Richard J. Rudy, David K. Lynch, Stephan M. Mazuk, C. C. Venturini, Richard C. Puetter, Raleigh B. Perry

Astronomy and Astrophysics, 2003

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DOI 10.1051/0004-6361:20031416

Data confidence 70 medium

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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). 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.