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Preprint 08c/95

The New Non-synchronous AM Her System RX J1940.1-1025

Rüdiger Staubert, Susanne Friedrich, Ralf Geckeler, Georg Lamer and Michael König

Institut für Astronomie und Astrophysik, Abt. Astronomie, Universität Tübingen, D-72076 Tübingen, Germany

Poster presented at the Conference Röntgenstrahlung from the Universe, Würzburg, Germany, September 25-29, 1995
to be published in the Proceedings of this Conference

Abstract. The ROSAT X-ray source RX J1940.1-1025 has recently been shown to be a new member of the rare class of asynchronous AM Her binaries. Of the three known AM Her objects of this kind with orbital periods near 3.4 h (the two others being V1500 Cyg and BY Cam) this object has the smallest separation (0.28%) between the orbital period (12116.26 +/- 0.01 s) and the spin period of the WD (12150.7 +/- 0.5 s). Contrary to the two others - in this object the orbital period is the shorter one, which places an interesting theoretical problem.

Paper (39k gzip'ed Postscript including figures)

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