• 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