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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/37963
Title: Recent discoveries of supersoft X-ray sources in M 31
Authors: Henze, Martin; Pietsch, Wolfgang; Haberl, Frank; Sala, Gloria; Hernanz, Margarita ; Hatzidimitriou, Despina; Rau, Arne; Hartmann, Dieter H.; Greiner, Jochen; Orio, Marina; Stiele, Holger; Freyberg, Michael J.
Keywords: Galaxies: individual: (M 31)
Novae, cataclysmic variables
Stars: individual: (M31N 2007-06b, M31N 2007-1 1a, M31N 2006-04a)
X-rays: binaries
Issue Date: Feb-2010
Publisher: Wiley-VCH
Citation: Astronomische Nachrichten 331 (2) : 193-196 (2010)
Abstract: Classical novae (CNe) have recently been reported to represent the major class of supersoft X-ray sources (SSSs) in the central area of our neighbouring galaxy M 31. This paper presents a review of results from recent X-ray observations of M 31 with XMM-Newton and Chandra. We carried out a dedicated optical and X-ray monitoring program of CNe and SSSs in the central area ofM 31. We discovered the first SSSs in M 31 globular clusters (GCs) and their connection to the very first discovered CN in a M 31 GC. This result may have an impact on the CN rate in GCs. Furthermore, in our optical and X-ray monitoring data we discovered the CN M3 1N 2007-11a, which shows a very short SSS phase of 29–52 days. Short SSS states (durations ≤ 100 days) of CNe indicate massive white dwarfs (WDs) that are candidate progenitors of supernovae type Ia. In the case of M31N 2007-11a, the optical and X-ray light curves suggest a binary containing a WD with MWD > 1.0 M⊙. Finally, we present the discovery of the SSS counterpart of the CN M31N 2006-04a. The X-ray light curve of M31N 2006-04a shows short-time variability, which might indicate an orbital period of about 2 hours.
Description: Publicado en línea el 9 de febrero de 2010.
Publisher version (URL): http://dx.doi.org/10.1002/asna.200911325
URI: http://hdl.handle.net/10261/37963
DOI: 10.1002/asna.200911325
ISSN: 1521-3994
E-ISSN: 0004-6337
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