MS 1603.6 + 2600, an unusual X-ray selected binary system at high Galactic latitude

Astronomy and Astrophysics – Astronomy

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Cataclysmic Variables, Eclipsing Binary Stars, Milky Way Galaxy, X Ray Binaries, Astronomical Photometry, Astronomical Spectroscopy, Polarimetry, X Ray Astronomy

Scientific paper

The discovery of an eclipsing binary system at Galactic latitude 47 deg, found as a serendipitous X-ray source in the Einstein Extended Medium Sensitivity Survey, is described. The object has X-ray flux 1.1 x 10 to the -12th ergs/sq cm s (0.3-3.5 keV) and mean magnitude R = 19.4. An orbital period of 111 minutes is found. The problem discussed is whether the system has a white dwarf or neutron star primary, in the end preferring the neutron star primary model. If the system has either optical or X-ray luminosities typical of low mass X-ray binaries (LMXB), it must be at a very large distance (30-80 kpc). Blueshifted He I absorption is seen, indicating cool outflowing material, similar to that seen in the LMXB AC 211 in the globular cluster M15.

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