Abstract
We have studied the photospheric abundances and circumstellar lines of a sample of Vega-like stars in an effort to improve the information available on this class of star.
King (1994) recently drew attention to the possible link between Vega-like stars and the photospheric metal-depleted class of A-stars, the λ Bootis stars. In the 6 Vega-like stars studied here for depletions, none showed the pattern of underabundance observed in λ Bootis stars. However, depletions of silicon and magnesium found in two of the sample could be linked to the presence of silicate dust grains in the circumstellar environment of those stars.
Circumstellar gas absorption lines have been positively identified in three stars from our sample. Individual cases show evidence either of high-velocity outflowing gas, variability in the circumstellar lines observed or evidence of circumstellar gas in excited lines of Fe II. No previous identification of circumstellar material has been made for two of the stars in question.
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© 1997 Springer Science+Business Media Dordrecht
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Dunkin, S.K., Barlow, M.J., Ryan, S.G. (1997). High Resolution Spectroscopy of Vega-Like Stars. In: Eiroa, C., Alberdi, A., Thronson, H., De Graauw, T., Schalinski, C.J. (eds) Infrared Space Interferometry: Astrophysics & the Study of Earth-Like Planets. Astrophysics and Space Science Library, vol 215. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5468-0_2
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DOI: https://doi.org/10.1007/978-94-011-5468-0_2
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