A 2.09-h Photometric Periodicity in GW Librae

Abstract

We have found a 2.09 h modulation in brightness of the dwarf nova GW Lib. This bears no special relationship to the 1.28 h spectroscopic period that is believed to be the orbital period. It was present in May 2001, but not in observations made in 1997 and 1998 and is of unknown origin. Similar unexplained periodicities are present in FS Aur and V2051 Oph.

7 pages, 3 figures (requires kluwer.cls). Accepted for publication in Astrophysics and Space Science

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