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 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9412m&link_type=abstract

HST Proposal ID #9412

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #9412

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, for comparison with the extensive data that exists for higher-metallicity Galactic stars. Our aim is to understand how effective temperatures depend upon metallicity {necessary in determining IMFs}, and to explore the astrophysically interesting regime of stars of extreme temperatures, masses, and luminosities. In order to do this, we need to measure 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 stars for which nebular contamination is significant in our ground-based data. We also include several R136 stars with excellent STIS/CCD data but which lack UV line measures. These new HST data will provide important information about the strengths of stellar winds at extreme luminosities and the calibration of the Wind Momentum- Luminosity Relationship at lower metallicities. This proposal was highly rated in Cycle 9, but only 4 snapshots were obtained. We have completed the analysis of these plus additional data from the archives, but need spectra of the remaining objects if we are to answer the questions we pose.

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