Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.2801p&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #28.01D; Bulletin of the American Astronomical Society, Vol. 24, p.1163
Other
Scientific paper
The star formation history of a region in the Perseus spiral arm of our Galaxy has been explored using CCD photometry, in the UBV system, of 23 open clusters. Magnitudes and colors of 35,788 stars were measured, making this the most comprehensive, homogeneous, single study of open cluster properties in one part of the Galaxy. The improved knowledge of the spatial distribution and formation sequence of the clusters, coupled with other studies of radial velocities, proper motions, and gas distribution in the region, strongly suggests that the majority of these clusters were formed during the impact of a high velocity cloud (HVC) with the Galactic disk. HVCs have been detected in this region and predictions of a recently published theoretical model of an HVC impact with the disk agree with the observational data extremely well. While it has been suggested that HVC impacts can trigger star formation, this is the first time that star formation can be directly connected to such an event. Mass functions for 8 of the clusters were calculated for stars more massive than the Sun, covering a region of the initial mass function (IMF) inaccessible through studies of field stars. These data indicate that, to about one solar mass, the mass functions of clusters, on average, are the same as the so-called `Salpeter field star IMF'. Deviations do occur, however, with at least two clusters showing significantly different slopes, suggesting that the IMF on a local level is not universal. Evidence for structure in the IMF, at various levels of significance, is also discussed. Variations in binary content were seen, although no obvious correlation with cluster age, mass, or size is found. Implications for the Cepheid star period-luminosity relation are discussed, since previous studies have associated Cepheids with 3 of the clusters in this survey.
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