Orbital periods of the binary sdB stars PG0940+068 and PG1247+554
P. F. L. Maxted, C. K. J. Moran, T. R. Marsh, A. A. Gatti
Abstract
We have used the radial velocity variations of two sdB stars previously reported to be binaries to establish their orbital periods. They are PG0940+068, (P=8.33d) and PG1247+554 (P=0.599d). The minimum masses of the unseen companions, assuming a mass of 0.5 solar masses for the sdB stars, are 0.090 +/- 0.003 solar masses for PG1247+554 and 0.63 +/- 0.02 solar masses for PG0940+068. The nature of the companions is not constrained further by our data.
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