{
  "id": "0907.4982",
  "version": "v1",
  "published": "2009-07-28T20:00:05.000Z",
  "updated": "2009-07-28T20:00:05.000Z",
  "title": "Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II",
  "authors": [
    "Paolo Bonfini",
    "Despina Hatzidimitriou",
    "Wolfgang Pietsch",
    "P. Reig"
  ],
  "comment": "Accepted for publication by Astronomy & Astrophysics (7 pages, 8 figures, and 2 tables)",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-07-28T20:00:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray sources",
      "bright optical counterparts",
      "spectroscopy",
      "normal late type star",
      "local group spiral galaxy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/200912508",
      "journal": "Astronomy and Astrophysics",
      "year": 2009,
      "month": "Nov",
      "volume": 507,
      "number": 2,
      "pages": 705
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 827194,
      "adsabs": "2009A&A...507..705B"
    }
  }
}