We report the discovery of a new bright (V∼12.6) 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\fh575 or 2\fh885, within the period "gap." A photometric modulation with a probable period of 2\fh595 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.
@article{arxiv.astro-ph/0108377,
title = {RX J1643.7+3402 : a new bright cataclysmic variable},
author = {A. M. Mickaelian and S. K. Balayan and S. A. Ilovaisky and C. Chevalier and M. -P. Veron-Cetty and P. Veron},
journal= {arXiv preprint arXiv:astro-ph/0108377},
year = {2015}
}
Comments
11 pages, 12 figures, accepted in Astronomy & Astrophysics