Other
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..744h&link_type=abstract
Astronomical Journal, vol. 84, June 1979, p. 744-751. Research sponsored by the National Geographic Society
Other
56
Andromeda Galaxy, Astronomical Maps, Galactic Structure, Open Clusters, Hydrogen Clouds, Pleiades Cluster, Star Distribution, Stellar Evolution, Stellar Magnitude
Scientific paper
This paper examines the properties of the 403 open star clusters in M31, most of which are small young objects similar to the Pleiades and h and Chi Persei. Their mean diameter is 20 pc. A crude age function for the younger stars is derived from the brightest stars; it differs from that of the LMC in the sense of a relative paucity of the very youngest clusters. The distribution of the young open clusters within M31 closely resembles the distribution of H I; there is a strong concentration of clusters to intermediate distances. An interesting difference in the distribution of young clusters and young stars, on the one hand, and the general intensity in the disk, on the other, is pointed out and briefly discussed. A comparison of the open clusters' positions with various spiral-arm patterns favors a gravitationally distorted two-armed trailing model.
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