The brightest blue and red stars in the galaxy M 81

Details The brightest blue and red stars in the galaxy M 81 The brightest blue and red stars in the galaxy M 81

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...95..581g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 95, no. 3, p. 581-588.

Astronomy and Astrophysics

Astrophysics

8

Blue Stars, Red Giant Stars, Spiral Galaxies, Color-Magnitude Diagram, H Ii Regions, Interstellar Extinction, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

New BV photometric data, obtained from the plates of a 6-m and a 2-m telescopes, are presented for about 170 brightest blue and red supergiant candidates (BBSC and BRSC, respectively) in M 81. A few bright blue stars appear at about 18.2 mag. Some of them are starlike objects which coincide with compact HII region. It is estimated that, if they belong to M 81 and using the contemporary distance modulus of M 81 obtained by Freedman and Madore (1988), the absolute magnitudes of three BBSC and BRSC are -9.6 and -8.6 mag. Two of the bright red stars have B-V greater than 1.75.

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