RX J1313.2-3259, a long-period Polar discovered with ROSAT
Abstract
We report observations of a new AM Herculis binary identified as the optical counterpart of the X-ray source RX J1313.2-3259, detected during the ROSAT All-Sky Survey (RASS). It has an orbital period of 251 min and is strongly modulated at optical wavelengths. The long-term behavior is characterized by a pronounced variation in X-rays between the RASS and two subsequent pointings (decrease by a factor 40 in count rate) and by moderate changes in the optical brightness (up to a factor 5). The X-ray spectrum is dominated by a soft quasi-blackbody component, with a smaller contribution from thermal bremsstrahlung. Measurements of high circular polarization confirm its classification as a Polar with a magnetic field strength of 56 MG. The average visual magnitude of RX J1313.2-3259 is V = 16 mag, for its distance we get 200 pc.
Cite
@article{arxiv.astro-ph/9911200,
title = {RX J1313.2-3259, a long-period Polar discovered with ROSAT},
author = {H. -C. Thomas and K. Beuermann and V. Burwitz and K. Reinsch and A. D. Schwope},
journal= {arXiv preprint arXiv:astro-ph/9911200},
year = {2007}
}
Comments
10 pages, 10 figures, to be published in Astronomy and Astrophysics