NGC 2287: an important intermediate-age open cluster

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 poin...

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Bibliographic Details
Published in:The Astronomical journal 1993-10, Vol.106 (4), p.1533-1546
Main Authors: HARRIS, G. L. H, VATTER FITZGERALD, M. P, MEHTA, S, REED, B. C
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Open clusters in the milky way
Stars
Stellar characteristics and properties
Stellar clusters and associations
Stellar structure, interiors, evolution, nucleosynthesis, ages
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary: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.
ISSN:0004-6256
1538-3881
DOI:10.1086/116745