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W92: A POSSIBLE GRAVITATIONALLY CONTRACTING BINARY SYSTEM IN NGC 2264

MERLE F. WALKER
Publications of the Astronomical Society of the Pacific
Vol. 89, No. 532 (December 1977), pp. 874-881
Stable URL: http://www.jstor.org/stable/40677176
Page Count: 8
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W92: A POSSIBLE GRAVITATIONALLY CONTRACTING BINARY SYSTEM IN NGC 2264
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Abstract

Periodic light variations have been detected in the star W92 in NGC 2264. The elements of the variation are: Minimum light = JD⊙2443128.963 + 0ḍ.74479E. The form of the light curve is unusual, being asymmetric with a slow rise from minimum to a maximum at 0.7P, followed by a rapid decline to the succeeding minimum. The amplitude of the variation ranges from 0ṃ04 to 0ṃ10 with little or no change in color from yellow to ultraviolet. While present data are inadequate to determine whether W92 is a member of NGC 2264, they suggest that the system could be an extremely young, gravitationally contracting binary. However, additional observations are needed to confirm this interpretation.

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