Abstract
We have obtained photoelectric UBV photometry for 100 stars, uvbyβ 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 uvbyβ 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 −1≤M V ≤3 we find a minimum binary frequency of 40% and discuss the possibility that the results may imply a binary frequency closer to 80%. The cluster age is found to be ∼2×10 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
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