The Properties and Evolution of Very Massive Stars

Details The Properties and Evolution of Very Massive Stars The Properties and Evolution of Very Massive Stars

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.2505h&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #25.05; Bulletin of the American Astronomical Society, Vol. 29, p.807

Astronomy and Astrophysics

Astronomy

Scientific paper

We present HST/FOS and GHRS spectra of 15 stars in the dense star cluster, R136a, in the Large Magellanic Cloud. These stars define an empirical isochrone for very massive stars (M > 40 Msun). We find that the cluster age is about 2.0 Myr, a time when the isochrone is very nearly vertical on the HR diagram. We have therefore used these stars: to refine the luminosity classification of early O-type stars to calibrate spectra of early O stars in terms of their fundamental parameters; to derive a new relation between the rate of mass-loss and the fundamental stellar parameters. The new mass-loss law is significantly different from previous prescriptions used by stellar evolutionary models. We therefore expect that it will have a significant impact on our knowledge of massive-star evolution.

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