RX J1643.7+3402: A new bright cataclysmic variable*
Byurakan Astrophysical Observatory and Isaac Newton Institute of Chile, Armenian branch, Byurakan 378433, Armenia e-mail: aregmick, firstname.lastname@example.org
2 Observatoire de Haute-Provence, CNRS, 04870 Saint-Michel l'Observatoire, France e-mail: chevalier, mira, email@example.com
Corresponding author: S. A. Ilovaisky, firstname.lastname@example.org
Accepted: 30 August 2001
We report the discovery of a new bright () 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 2575 or 2885, within the period “gap”. A photometric modulation with a probable period of 2595 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
© ESO, 2002