Spectral Classification of Massive Stars in M31 and M33

Details Spectral Classification of Massive Stars in M31 and M33 Spectral Classification of Massive Stars in M31 and M33

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915217s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #152.17

Astronomy and Astrophysics

Astronomy

Scientific paper

M31 and M33 are important galaxies to study when trying to understand stellar evolution. We observed 1,717 objects at the 6.5-m MMT using the 300-fiber fed spectrometer, Hectospec, in order to find massive stars in M31 and M33, of which 904 were from sources in M31 and M33. Of these sources, 129 O-type, 601 B-type supergiant, 81 A-type supergiant, 26 G-type supergiant, 20 F-type supergiant, 22 LBV candidates, and 25 Wolf-Rayet stars were classified. By finding the relative number of different massive stars in M31 and M33, the data can help refine stellar evolution models of massive stars by putting constraints on such models. In addition, these classifications were added to the photometry taken in the Local Group Galaxy Survey (Massy 2006) to make a more thorough catalog of sources in the direction of M31 and M33. This project was made possible by support from the National Science Foundation, through grants AST-1004107 and AST-1005313.

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