STIS spectroscopy of newborn massive stars in SMC N81

Details STIS spectroscopy of newborn massive stars in SMC N81 STIS spectroscopy of newborn massive stars in SMC N81

2001-10-26

arxiv.org/abs/astro-ph/0110576v1

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures

Scientific paper

10.1051/0004-6361:20011574

Using Hubble Space Telescope observations with STIS, we study the main exciting stars of N81, a high excitation compact Hii region in the Small Magellanic Cloud (SMC). These far UV observations are the first spectroscopic measurements of stars in such a region and reveal features characteristic of an O6-O8 stellar type. The astonishing weakness of their wind profiles and their sub-luminosity (up to ~ 2 mag fainter in Mv than the corresponding dwarfs) make these stars a unique stellar population in the Magellanic Clouds. Our analysis suggests that they are probably in the Hertzsprung-Russell diagram locus of a particularly young class of massive stars, the so-called Vz luminosity class, as they are arriving on the zero age main sequence.

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