XMM-Newton observation of MACHO 104.20906.960: a dwarf nova candidate with a 2 h period

Abstract

The binaries known as cataclysmic variables are particular binary systems in which the primary star (a white dwarf) accretes material from a secondary via Roche-lobe mechanism. Usually, these objects have orbital period of a few hours so that a detailed temporal analysis can be performed. Here, we present Chandra $XMM$-Newton observations of a dwarf nova candidate identified in the past by optical observations towards the galactic Bulge and labeled as MACHO 104.20906.960. After a spectral analysis, we used the Lomb-Scargle technique for the period search and evaluated the confidence level using Monte-Carlo simulations. In this case, we found that the $X$-ray source shows a period of $2.03_{-0.07}^{+0.09}$ hours (3$\sigma$ error) so that it is most likely a system of interacting objects. The modulation of the signal was found with a confidence level of $>$99%. The spectrum can be described by a two thermal plasma components with X-ray flux in the 0.3--10 keV energy band of $1.77_{-0.19}^{+0.16}\times 10^{-13}$ erg s${}^{-1}$ cm${}^{-2}$. We find that the distance of the source is approximately 1 kpc thus corresponding to a luminosity $L_X\simeq 2\times 10^{31}$ erg s${}^{-1}$.

2008, in press on New Astronomy, (http://www.elsevier.com/wps/find/journaldescription.cws_home/601274/description#description); XMM-Newton observation of MACHO 104.20906.960: a dwarf nova candidate with a 2 h period

References in corpus (2)

• A 33 hour period for the Wolf-Rayet/black hole X-ray binary candidate NGC 300 X-1
• XMM observation of 1RXS J180431.1-273932: a new M-type X-ray binary with a 494 s-pulse period neutron star?

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