Uv Observations of the Hubble-Sandage Variables in M33 - Cycle 4 Carryover

Details Uv Observations of the Hubble-Sandage Variables in M33 - Cycle 4 Carryover Uv Observations of the Hubble-Sandage Variables in M33 - Cycle 4 Carryover

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5688h&link_type=abstract

HST Proposal ID #5688

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #5688 Stellar Astrophysics Massive Stars

Scientific paper

The Hubble-Sandage variables in M33 are luminous blue variables (LBVs) -- very luminous, eruptively unstable stars in the same general class as S Dor, Eta Car, and P Cyg. UV observations of H-S variables will significantly enhance the limited information available to us concerning the evolution and structure of the most massive stars. ---- LBVs are important in several major astrophysical connections and are only beginning to be understood. Since the LBV stage of evolution is brief, only a few examples are available in our Galaxy and in the Magellanic Clouds, close enough for UV observations with IUE. Therefore our coverage of the wide parameter space embraced by LBVs has been so sparse that theoretical development has been hindered. ---- With the ST, we can significantly increase this coverage by adding the H-S variables in M33 to the set of "useful" LBVs. UV spectroscopy is needed to determine their temperatures, luminosities, and mass-loss rates. These parameters are required to clarify their relations to other LBVs and very massive stars in general, and to provide more information on evolutionary origin of LBVs, physical causes of the violent eruptions, and other problems.

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