Cepheids, gas, and star complexes in the Andromeda Nebula

Details Cepheids, gas, and star complexes in the Andromeda Nebula Cepheids, gas, and star complexes in the Andromeda Nebula

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..333e&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 6, June 1980, p. 333-339.) Soviet Astronomy Letters, vol. 6, May-June 1980, p. 184-188.

Astronomy and Astrophysics

Astronomy

4

Andromeda Galaxy, Cepheid Variables, Galactic Structure, Interstellar Gas, Star Clusters, B Stars, H Ii Regions, Hydrogen Atoms, O Stars, Spatial Distribution, Stellar Evolution

Scientific paper

Together with blue stars and H II regions, the Cepheid variables in Baade's fields I and II of M81 tend to form groupings roughly 0.2-1.0 kpc in diameter, analogous to the star complexes observed in the Galaxy. In the spiral arms these groupings overlap one another. Many of van den Berg's OB associations consist of several complexes. The mean period and hence mean mass of the Cepheids increases with the H I volume density. The observed lengthening of Cepheid periods toward the centers of M81 and of the Galaxy is attributable to enhanced star-formation activity in broad annular zones of peak hydrogen density and, in part, to observational selection.

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