The Physical Parameters of the Hottest, Most Luminous Stars as a Function of Metallicity

Details The Physical Parameters of the Hottest, Most Luminous Stars as a Function of Metallicity The Physical Parameters of the Hottest, Most Luminous Stars as a Function of Metallicity

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8633m&link_type=abstract

HST Proposal ID #8633

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #8633 Hot Stars

Scientific paper

We have obtained excellent, new ground-based blue optical and HAlpha spectra of a sample of very early-type stars in the Magellanic Clouds in order to measure their physical properties, and compare these to the extensive data that exists for higher metallicity Galactic stars. What we lack is knowledge of the stellar wind terminal velocities for our stars, necessary to constrain the stellar models. These can only be measured with STIS/FUV on HST. In addition, we will obtain higher spatial resolution data on the HAlpha line for six of our stars for which nebular contamination is significant even with long-slit subtraction in our ground- based data. These new HST data will allow us to understand how the spectral type to effective temperatures depend upon metallicity {necessary in determining IMFs}, as well as allow us to explore the astrophysically interesting regime of stars of extreme temperatures, masses and luminosities. Together with the optical data, they will also provide important information about the strengths of stellar winds at extreme luminosities and the calibration of the Wind Momentum - Luminosity Relationship at lower metallicities.

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