Metallicity effects in the spectral classification of O-type stars. Theoretical consideration

Details Metallicity effects in the spectral classification of O-type stars. Theoretical consideration Metallicity effects in the spectral classification of O-type stars. Theoretical consideration

2009-03-10

arxiv.org/abs/0903.1706v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Fourth Conference of the Bulgarian Astronomical Society, 23-24 February, 2009, Sofia The proceeding will be published in the B

Scientific paper

Based on an exteded grid of NLTE, line blanketed model atmospheres with stellar winds as calculated by means of FASTWIND, we have investigated the change in the strengths of strategic Helium transitions in the optical as caused by a 0.3 decrease in metallicity with respect to solar abundances. Our calculations predict that only part of the observed increase in Teff, of O-type dwarfs could be explained by metallicity effects on the spectral type indicators, while the rest must be attributed to other reasons (e.g., different stellar structures as a function of metallicity or differences between observed and theoretical wind parameters etc.). In addition, we found that using the He II 4686 line to classify stars in low metallicity environments (Z < 0.3 solar) might artificially increase the number of low luminosity (dwarfs and giants) O-stars, on the expense of the number of O-supergiants.

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