* Astronomy

Title: KBS 13 -- a Rare Reflection Effect sdB Binary with an M Dwarf Secondary
Authors: B.Q. For, H. Edelmann, E. M. Green, H. Drechsel, S. Nesslinger, G. Fontaine

We report preliminary VRI differential photometric and spectroscopic results for KBS 13, a recently discovered non-eclipsing sdB+dM system. Radial velocity measurements indicate an orbital period of 0.2923 ± 0.0004 days with a semi-amplitude velocity of 22.82 ± 0.23 km s-1. This suggests the smallest secondary minimum mass yet found. We discuss the distribution of orbital periods and secondary minimum masses for other similar systems.

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