Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9097m&link_type=abstract
HST Proposal ID #9097
Physics
Hst Proposal Id #9097 Hot Stars
Scientific paper
The mass-luminosity relation is well determined for intermediate-mass stars, and on-going HST observations are extending the relationship to stars of very low mass. Here we propose to obtain similar, fundamental data on the highest mass stars, where physical complications {mass-loss, mixing} make such studies a necessary check on the stellar models. Empirical checks are particularly important given the factor- of-two ``mass discrepancy" that exists in the masses inferred from stellar atmospheres, and those computed from stellar interiors. We have selected 7 nearby, early-type stars with established velocity variations characteristic of long-period binaries. We will attempt to resolve these systems using the FGS. The separations, combined with double-lined spectroscopic orbit solutions, will provide unambiguous mass determinations. Success for even one system will allow us to anchor the high- luminosity end of the mass-luminosity relationship, and resolve the mass discrepancy.
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