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Title:
Studies of luminous stars in nearby galaxies. IV - Baade's field IV in M31
Authors:
Humphreys, R. M.
Publication:
Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 854-860. (ApJ Homepage)
Publication Date:
12/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ANDROMEDA GALAXY, STAR DISTRIBUTION, STELLAR EVOLUTION, STELLAR LUMINOSITY, STELLAR SPECTROPHOTOMETRY, SUPERGIANT STARS, HERTZSPRUNG-RUSSELL DIAGRAM, INTERSTELLAR EXTINCTION, MILKY WAY GALAXY, RADIAL VELOCITY, UBV SPECTRA, VISUAL PHOTOMETRY
Comment:
A&AA ID. AAA026.158.196
DOI:
10.1086/157566
Bibliographic Code:
1979ApJ...234..854H

Abstract

The spectra and luminosities of the brightest stars, the color-magnitude diagrams, the ages and dimensions of the associations, and even the ratio of blue to red supergiants in Baade's Field IV in the outer parts of M 31 are all very similar to those observed in the spiral features in our region of the Milky Way. These observations suggest that the stellar evolution of the Population I members of M 31 is very similar to that of the spiral arm population in the Galaxy, although the results apply to only one small region in one spiral feature. Further studies of the stellar content of other M 31 regions may reveal differences.

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