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ASCA Observation of MS 1603.6+2600 (=UW Coronae Borealis): A Dipping Low-Mass X-ray Binary in the Outer Halo?MS 1603.6+2600 is a high-latitude X-ray binary with a 111 min 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 1 (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 deg away from MS 1603.6+2600 on the sky at an estimated distance of 73.8 kpc.
Document ID
Document Type
Preprint (Draft being sent to journal)
Mukai, Koji (NASA Goddard Space Flight Center Greenbelt, MD United States)
Smale, Alan (NASA Goddard Space Flight Center Greenbelt, MD United States)
Stahle, Caroline K. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Schlegel, Eric M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Wijnands, Rudy (Massachusetts Inst. of Tech. Cambridge, MA United States)
White, Nicholas E.
Date Acquired
September 7, 2013
Publication Date
January 1, 2001
Subject Category
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.

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