Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..488p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 488-513.
Astronomy and Astrophysics
Astronomy
117
Galactic Evolution, Open Clusters, Stellar Mass, Astronomical Photometry, Color-Magnitude Diagram, Emission Spectra, H Alpha Line, Spatial Distribution
Scientific paper
The results of a combined astrometric, photometric, and spectroscopic search for low-mass members in the intermediate-age open cluster Alpha Persei are presented. Over 130 low-mass new members have been identified to M(v) about 12.5, almost doubling the previous number of known members. The new membership information suggests a slight upward revision of Alpha Per's age to about 8 x 10 exp 7 yr. Alpha Per is noticeably spatially elongated in a direction parallel to the Galactic plane, most likely due to tidal deformation. Analysis of the distribution of relative H-alpha emission strengths among Alpha Per members confirms the view that the mean H-alpha strength decreases in increasingly older systems. Allowing for survey incompleteness, one cannot reject the idea that the luminosity function is consistent with the field luminosity function to M(v) about 9 or 10.
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