Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II

Details Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II

2009-07-28

arxiv.org/abs/0907.4982v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted for publication by Astronomy & Astrophysics (7 pages, 8 figures, and 2 tables)

Scientific paper

A recent survey of the Local Group spiral galaxy M 31 with XMM-Newton yielded a large number of X-ray sources. This is the second in a series of papers with the aim of identifying the optical counterparts of these X-ray sources. We have obtained optical spectra for 21 bright optical counterparts of 20 X-ray sources in the direction of M 31, using the 1.3-m Skinakas telescope in Crete, Greece. For 17 of the 20 X-ray sources, we have identified the optical counterpart as a normal late type star (of type F or later) in the foreground (i.e. in the Milky Way). For two more sources there were two possible optical counterparts in each case, while two more objects have X-ray properties that are not compatible with the spectral characteristics of late type non-flaring stars.

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