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2002•Astronomy and AstrophysicsOpen access

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

A. M. Mickaelian, S. K. Balayan, S.A. Ilovaisky, C. Chevalier, M. P. Véron-Cetty, P. Véron

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Abstract

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.

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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.

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Available abstract

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 concepts: Cataclysmic variable star, ROSAT, Astrophysics, Physics, Amplitude, Accretion disc, Period (music), Modulation (music)

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