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Title:
ASCA Observation of MS 1603.6+2600 (=UW Coronae Borealis): A Dipping Low-Mass X-Ray Binary in the Outer Halo?
Authors:
Mukai, Koji; Smale, Alan P.; Stahle, Caroline K.; Schlegel, Eric M.; Wijnands, Rudy
Affiliation:
AA(NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771; Also Universities Space Research Association.), AB(NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771; Also Universities Space Research Association.), AC(NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771), AD(Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AE(Center for Space Research, Massachusetts Institute for Technology, 77 Massachusetts Avenue, Cambridge, MA 02139)
Publication:
The Astrophysical Journal, Volume 561, Issue 2, pp. 938-942. (ApJ Homepage)
Publication Date:
11/2001
Origin:
UCP
ApJ Keywords:
stars: individual (MS 1603.6+2600), X-Rays: Stars
DOI:
10.1086/323383
Bibliographic Code:
2001ApJ...561..938M

Abstract

MS 1603.6+2600 is a high-latitude X-ray binary with a 111 minute orbital period, thought to be either an unusual cataclysmic variable or an unusual low-mass X-ray binary. In an ASCA observation in 1997 August, we find a burst, whose light curve suggests a type I (thermonuclear flash) origin. We also find an orbital X-ray modulation in MS 1603.6+2600, which is likely to be periodic dips, presumably due to azimuthal structure in the accretion disk. Both are consistent with this system being a normal low-mass X-ray binary harboring a neutron star, but at a great distance. We tentatively suggest that MS 1603.6+2600 is located in the outer halo of the Milky Way, perhaps associated with the globular cluster Palomar 14, 11° away from MS 1603.6+2600 on the sky at an estimated distance of 73.8 kpc.
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