Volume 526, February 2011
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||24 December 2010|
Virtual Observatory based identification of AX J194939+2631 as a new cataclysmic variable⋆
Observatoire de Paris-Meudon, LERMA, UMR 8112,
61 Av. de l’Observatoire,
2 Sternberg Astronomical Institute, Moscow State University, Universitetskij pr., 13, 119992 Moscow, Russia
3 Observatoire de Paris, VO-Paris Data Centre, 61 Av. de l’Observatoire, 75014 Paris, France
4 Observatoire astronomique de Strasbourg, UMR 7550, Université de Strasbourg/CNRS, 11 rue de l’Université, 67000 Strasbourg, France
Accepted: 11 October 2010
We report the discovery of a new cataclysmic variable (CV) among unidentified objects from the ASCA Galactic Plane Survey made using the Virtual Observatory data mining. First, we identified AX J194939+2631 with IPHAS J194938.39+263149.2, the only prominent Hα emitter among 400 sources in a 1 arcmin field of the IPHAS survey, then secured as a single faint X-ray source found in an archival Chandra dataset. Spectroscopic follow-up with the 3.5-m Calar Alto telescope confirmed its classification as a CV, possibly of magnetic nature. Our analysis suggests that AX J194939+2631 is a medium distance system (d ≈ 0.6 kpc) containing a late-K or early-M type dwarf as a secondary component and a partially disrupted accretion disc revealed by the double-peaked Hα line. However, additional deep observations are needed to confirm our tentative classification of this object as an intermediate polar.
Key words: novae, cataclysmic variables / X-rays: binaries / X-rays: individuals: AX J194939+2631 / stars: individual: IPHAS J194938.39+263149.2
© ESO, 2010
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