EDP Sciences
Free access
Volume 381, Number 3, January III 2002
Page(s) 894 - 904
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011244

A&A 381, 894-904 (2002)
DOI: 10.1051/0004-6361:20011244

RX J1643.7+3402: A new bright cataclysmic variable

A. M. Mickaelian1, S. K. Balayan1, S. A. Ilovaisky2, C. Chevalier2, M.-P. Véron-Cetty2 and P. Véron2

1  Byurakan Astrophysical Observatory and Isaac Newton Institute of Chile, Armenian branch, Byurakan 378433, Armenia
    e-mail: aregmick, sbalayan@bao.sci.am
2  Observatoire de Haute-Provence, CNRS, 04870 Saint-Michel l'Observatoire, France
    e-mail: chevalier, mira, veron@obs-hp.fr

(Received 17 July 2001 / Accepted 30 August 2001)

We report the discovery of a new bright ( $V\sim12.6$) cataclysmic variable star identified with the ROSAT X-ray source RX J1643.7+3402. Spectroscopic and photometric observations show it to be a novalike variable sharing some of the characteristics of the SW Sex sub-class of novalike CVs. The spectroscopic period may be either 2 $\fh$575 or 2 $\fh$885, within the period "gap". A photometric modulation with a probable period of 2 $\fh$595 and an amplitude of ~0.1 mag in V is present on most nights and could be either a "positive" or a "negative" superhump modulation (depending on the exact spectroscopic period), indicating the presence of a precessing accretion disk in this system. Rapid variations of 0.1 to 0.2 mag amplitude in V repeat with a time scale of ~15 min.

Key words: accretion, accretion disks -- stars: novae, cataclysmic variables -- stars: binaries: close

Offprint request: S. A. Ilovaisky, ilovaisky@obs-hp.fr

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© ESO 2002