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Open Access item 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
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
E-ISSNmetadata.dc.identifier.doi = DOI:0004-6337
Appears in Collections:(ICE) Artículos

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