Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1533h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1533-1546.
Astronomy and Astrophysics
Astronomy
17
Binary Stars, Color-Color Diagram, Star Clusters, Star Distribution, Stellar Spectra, Astronomical Photometry, Red Giant Stars, Sky Surveys (Astronomy), Ultraviolet Astronomy
Scientific paper
We have obtained photoelectric UBV photometry for 100 stars, uvby-beta photometry for 39 stars, and MK spectral types for 80 stars in the field of NGC 2287. After combination with data from other sources, several interesting cluster properties are apparent. Both the UBV and uvby-beta photometry point to a small but nonzero reddening, while our spectral types confirm previous results indicating a high binary frequency for the cluster. Based on our spectral and photometric data for the cluster members with M(V) of between -1 and 3, we find a minimum binary frequency of 40 percent and discuss the possibility that the results may imply a binary frequency closer to 80 percent. The cluster age is found to be about 2 x 10 exp 8 yr based on both the main-sequence turnoff and the red giant distribution; the width of the turnup region can probably be explained by a combination of duplicity and a range in stellar rotation.
Fitzgerald P. V. M.
Harris Gretchen L. H.
Mehta Sanju
Reed Cameron B.
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