Unusually Increased Activity of GZ Cnc

Details Unusually Increased Activity of GZ Cnc Unusually Increased Activity of GZ Cnc

2002-07-23

arxiv.org/abs/astro-ph/0207484v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, submitted to Inf. Bull. Var. Stars

Scientific paper

GZ Cnc was discovered as a variable star by Takamizawa (Tmz V34), which turned out to a cataclysmic variable (CV). Past studies have shown that this object is a good candidate for a rarely outbursting, long-period dwarf nova. Only three outbursts were recorded between 1999 and 2001. In 2002 March-May, the object suddenly showed a dramatic increase of the outburst frequency. The shortest observed interval was only 11 d. We suggest that the present behavior may be interpreted as a clustering of short outbursts occasionally seen in intermediate polars (magnetic CVs). The present activity can also be comparable to V426 Oph, another dwarf nova which is known to show occasionally increased activities. The resemblances in the X-ray properties and the outburst behavior suggests that GZ Cnc and V426 Oph may comprise a new class of (weakly magnetic) cataclysmic variables.

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