Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6040b&link_type=abstract
HST Proposal ID #6040
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6040 Hot Stars
Scientific paper
The upper mass limit for individual stars remains an open question of great importance in astronomy. Theory is not currently capable of placing a firm upper mass limit and, therefore, the problem is an observational one. O3 stars in giant HII regions are the hottest and presumably the most massive Population I stars. Of the 70 definite and possible members of this class, 59 are in the Magellanic Clouds (Walborn 1994). The Carina Nebula has the highest concentration of these stars in the Milky Way and hence provides the most accessible laboratory for the investigation of the most massive stars. The LMC has the most extreme examples; i.e., those objects which are candidates for the most massive star. We propose to use the Fine Guidance Sensor (FGS) in its interferometric mode to investigate a complete sample of six O3 stars in Carina and three extreme objects in the LMC in order to establish if these stars are massive single stars or if, like R136a in the LMC, they are multiple star systems.
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