Hutton, Kate and Henden, Arne and Terrell, Dirk (2009) BVRI Photometry of the CX Cephei System (WR 151). Publications of the Astronomical Society of the Pacific, 121 (881). pp. 708-715. ISSN 0004-6280 http://resolver.caltech.edu/CaltechAUTHORS:20090902-150624014
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We have obtained 699 new BVRI observations of the O5 + WN5 eclipsing binary system CX Cephei (WR 151), plus 126 more observations in V only. Our light curves are consistent with previous studies, showing a primary minimum (where the O5 star is eclipsed) of approximately 0.1 mag depth and a much smaller secondary minimum with an approximately 0.03 mag depth. Using the PHOEBE interface to the Wilson-Devinney computer code, we were able to obtain a reasonably satisfactory fit to these data, ignoring any possible contribution from atmospheric eclipse phenomena. The best-fit solution has i = 61.1° and results in masses of 36.8 M_☉ for the O5 star and 26.4 M_☉ for the Wolf-Rayet (WR) star. The binary system is detached. There is an asymmetry in the light curve, suggesting that the “leading side” of the O5 star (or the trailing side of the WR star) is brighter than vice versa. We also observed some features in the light curve that were persistent, but which we could not model.0 - C residuals relative to the PHOEBE fit reveal time variations with a total range of approximately 12% of the flux. Comparing our data with those of Lipunova & Cherpashchuk (1982), we find that the secondary minimum is less prominent today than it was in the 1980s. We were able to revise their period estimate to 2.12691 days.
|Additional Information:||© 2009. The Astronomical Society of the Pacific. Received 2009 April 11; accepted 2009 May 29; published 2009 June 26.|
|Official Citation:||BVRI Photometry of the CX Cephei System (WR 151) Kate Hutton, Arne Henden, and Dirk Terrell Publications of the Astronomical Society of the Pacific 2009 121:881, 708-715|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||15 Sep 2009 16:16|
|Last Modified:||26 Dec 2012 11:18|
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