X-Ray Variability of MS 1603.6+2600

Details X-Ray Variability of MS 1603.6+2600 X-Ray Variability of MS 1603.6+2600

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...690.1145n&link_type=abstract

The Astrophysical Journal, Volume 690, Issue 2, pp. 1145-1147 (2009).

Astronomy and Astrophysics

Astronomy

Accretion, Accretion Disks, Stars: Neutron, X-Rays: Binaries, X-Rays: Individual: Ms 1603.6+2600, X-Rays: Stars

Scientific paper

We report on the archival analysis of low-mass X-ray binary MS 1603.6+2600 observed with the Rossi X-Ray Timing Explorer. The 2.5-20 keV X-ray light curve shows a broad modulation with a period of 110.1 ± 1.0 min. The X-ray period is consistent with the optical period. The spectrum during the low-intensity phase differs from the high-intensity spectrum by an energy-independent reduction in intensity, and not due to additional absorption. Our findings concur with an earlier suggestion by Hakala et al. that the orbital intensity modulation is caused by a partial covering of an extended emission region by a thick absorber. We also estimate the distance to MS 1603.6+2600 to be <24 kpc if the X-ray-emitting region is optically thin.

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