An ultraviolet spectral library of metal-poor OB stars

Details An ultraviolet spectral library of metal-poor OB stars An ultraviolet spectral library of metal-poor OB stars

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..17e&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present new HST/STIS ultraviolet spectroscopy of 12 B-type stars in the Small Magellanic Cloud (SMC). From a morphological comparison with archival IUE data, the spectra are found to be distinctly different to Galactic analogues because of the SMC metal deficiency. The intensity of the P Cygni emission in the UV resonance lines is greater, and seen to later spectral types, in the Galactic spectra than in their SMC counterparts. We attribute these effects as arising from weaker stellar winds in the SMC targets. Combined with previous HST observations of O-type stars, we now have metal-poor ultraviolet templates for a large part of the upper Hertzsprung-Russell (H-R) diagram, of use in interpreting the stellar populations in starbursts and high-redshift systems.

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