Open AccessOutburst Photometry of the Eclipsing Dwarf Nova GY Cancri
Author(s) -
Taichi Kato,
Ryoko Ishioka,
Makoto Uemura
Publication year - 2002
Publication title -
publications of the astronomical society of japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.99
H-Index - 110
eISSN - 2053-051X
pISSN - 0004-6264
DOI - 10.1093/pasj/54.6.1023
Subject(s) - physics , dwarf nova , astrophysics , orbital period , eclipse , photometry (optics) , cataclysmic variable star , light curve , astronomy , rosat , orbital inclination , white dwarf , stars , galaxy , binary number , mathematics , arithmetic
We observed the ROSAT-selected eclipsing dwarf nova GY Cnc (=RX J0909.8+1849)during the 2001 November outburst. We refined the orbital period to be0.17544251(5) d. The fading portion of the outburst was indistinguishable fromthose of typical dwarf novae with similar orbital periods. However, thesignature of orbital humps (or a hot spot) was far less prominently observed inthe orbital light curves and eclipse profiles than in usual dwarf novae withsimilar orbital periods. The combination of low frequency of outbursts and theapparent lack of slowly rising, long outbursts in GY Cnc is difficult toreconcile within the standard framework of dwarf novae. We suspect that GY Cncmay be the first above-the-gap counterpart of unusual eclipsing dwarf novae HTCas and IR Com.Comment: 6 pages, 7 figures, to appear in Publ. Astron. Soc. Japa
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