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Título : Recent discoveries of supersoft X-ray sources in M 31
Autor : 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.
Palabras clave : Galaxies: individual: (M 31)
Novae, cataclysmic variables
Stars: individual: (M31N 2007-06b, M31N 2007-1 1a, M31N 2006-04a)
X-rays: binaries
Fecha de publicación : Feb-2010
Editor: Wiley-VCH
Citación : Astronomische Nachrichten 331 (2) : 193-196 (2010)
Resumen: 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.
Descripción : Publicado en línea el 9 de febrero de 2010.
Versión del editor:
ISSN: 1521-3994
DOI: 10.1002/asna.200911325
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