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Optical photometric variability of 2S 0114+65In this paper we present Johnson V photometry of the Be/x-ray binary star system 2S 0114+65. Although this star exhibits periodic variations in x-rays, optical studies have failed to reveal fluctuations greater than 5 millimag. The data presented in this paper provide the first evidence for periodic optical variability in 2S 0114+65. On each of four nights in October 1993, we find low amplitude variations with a period of 2.77 +/- 0.48 h and with a semiamplitude of 4 millimag. This period is in good agreement with results of a comprehensive study of the x-ray data. We explore the possibility that this period represents the pulsational period of the B-star primary and the possibility that it is the rotational period of the neutron star. If the latter is the correct interpretation, we calculate a spin-up time scale of 5 x 10(exp 5) yr.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Taylor, M. (Loras College, Dubuque, IA United States)
Finley, J. P. (Perdue University West Lafayette, IN, United States)
Kurt, C. (Perdue University West Lafayette, IN, United States)
Koenigsberger, G. (Universidad National Autonoma de Mexico D.F., Mexico)
Date Acquired
August 16, 2013
Publication Date
January 1, 1995
Publication Information
Publication: The Astronomical Journal
Volume: 109
Issue: 1669
ISSN: 0004-6256
Subject Category
Distribution Limits