Spectroscopy of luminous blue stars in M31 and M33

Details Spectroscopy of luminous blue stars in M31 and M33 Spectroscopy of luminous blue stars in M31 and M33

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99...84h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 84-96.

Astronomy and Astrophysics

Astronomy

44

Andromeda Galaxy, Blue Stars, Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Astronomical Photometry, Charge Coupled Devices, Early Stars, Interstellar Extinction

Scientific paper

Spectra have been obtained for classification of 42 candidate supergiants and 12 probable OB stars in M31 and eight early-type stars in M33. Twenty-six of those in M31 and six in M33 are confirmed as apparent single members with spectral types ranging from O8 to F8. Their interstellar extinction and luminosities are derived from published photographic and CCD photometry for all of the confirmed members. The preliminary and still incomplete HR diagram obtained for M31 shows an apparent lack of the most massive stars, stars with initial masses greater than 60 solar masses. The effects of incompleteness and observational selection on the interpretation of this HR diagram are discussed.

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