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MS 1603.6 + 2600, an unusual X-ray selected binary system at high Galactic latitudeThe 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.
Document ID
19910033880
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Morris, Simon L.
(Carnegie Institution of Washington Stanford, CA, United States)
Liebert, James
(Observatories of the Carnegie Institution Pasadena, CA, United States)
Stocke, John T.
(Colorado, University Boulder, United States)
Gioia, Isabella M.
(Carnegie Institution of Washington Stanford, CA, United States)
Schild, Rudy E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
December 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 365
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A18503
Funding Number(s)
CONTRACT_GRANT: NAG5-1224
CONTRACT_GRANT: NAS8-30751
CONTRACT_GRANT: NAS5-30101
CONTRACT_GRANT: NSF AST-87-15983
Distribution Limits
Public
Copyright
Other

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