Star complexes and associations in the Andromeda galaxy

Details Star complexes and associations in the Andromeda galaxy Star complexes and associations in the Andromeda galaxy

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.135..119e&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 135, no. 1, July 1987, p. 119-130.

Astronomy and Astrophysics

Astrophysics

62

Andromeda Galaxy, B Stars, O Stars, Star Clusters, Star Distribution, Stellar Spectrophotometry, Diameters, Open Clusters, Spectral Resolution, Stellar Evolution

Scientific paper

Large-scale U and B plates obtained with the 2-m Ritchey-Chretien telescope of the Rozhen Observatory (Bulgaria) were searched for new resolved star groups and for independent delineation of the boundaries of the known ones in M31. Two hundred and ten groups were detected as real O-associations the mean diameter of which is 80 pc. Many of Hodge's open clusters are also reclassified as O-associations. The majority of van den Bergh's OB-associations were recognized as star complexes; their mean diameter is 650 pc. Almost all O-associations are located inside the star complexes. A dozen of new star complexes (mainly around the dark lanes between OB78 and OB22) and numerous groups presumably not containing O-stars were found. Young star groups closer than 3 kpc to the center of M31 were not identified.

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