Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sval....8..357e&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Nov. 1982, p. 663-670) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.
Astronomy and Astrophysics
Astronomy
15
B Stars, Cepheid Variables, O Stars, Spiral Galaxies, Star Clusters, Stellar Evolution, Astrometry, Milky Way Galaxy, Molecular Clouds, Star Distribution, Stellar Magnetic Fields, Stellar Mass
Scientific paper
The OB association in the Galaxy, the LMC, M31, and M33 are typically 200-300 pc in diameter; they often represent groupings of several components. Star complexes are twice the size of OB associations, on the average; the presence of Cepheids and O stars implies that the members of complexes may have an age dispersion of up to 6 x 10 to the 7th yr. Within complexes and large associations, denser regions approximately 100 pc across with approximately 1 x 10 to the 7th yr age dispersion may occur; their stars presumably originated from a common giant molecular cloud. Some complexes show evidence of a discrete age distribution, perhaps testimony to star formation through Parker instability.
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