Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..269b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 269-271.
Astronomy and Astrophysics
Astrophysics
9
Andromeda Galaxy, B Stars, Early Stars, O Stars, Open Clusters, Star Clusters, Star Formation, Massive Stars, Spatial Distribution, Stellar Spectra, Supergiant Stars
Scientific paper
The problem of the real spatial distribution of OB stars in M 31, with particular attention on whether these stars follow a hierarchical distribution in agreement with the scenario of star formation proposed by Elmegreen & Elmegreen (1983), is addressed. The first step in this direction would be to provide an objective identification of the OB associations in M 31 and then to study their spatial distribution. Unfortunately, this task is made difficult by the fact that the catalogs of OB stars in M 31 available in the literature are mainly limited to supergiant stars. The recent PLC identification technique for OB associations (Battinelli, 1991) is therefore applied in four stellar fields of M 31 for which high-resolution photometric data ensure that almost all of the OB stars have been identified. Results are in agreement with other works in the literature and show that the sizes of the OB associations in these fields of M 31 are similar to the sizes of their counterparts in the Milky Way and in the Magellanic Clouds.
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