Swift Observations of the Ultra-compact Binary 4U 1850-087

Details Swift Observations of the Ultra-compact Binary 4U 1850-087 Swift Observations of the Ultra-compact Binary 4U 1850-087

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atel.1551....1p&link_type=abstract

The Astronomer's Telegram, #1551

Astronomy and Astrophysics

Astronomy

X-Ray, Binaries, Neutron Stars, Transients

Scientific paper

We report on six observations of the ultra-compact X-ray binary 4U 1850-087 (P_orb = 21 min) in a rare high flux state, taken by Swift. Observations were made on 12, 14, 15, 16, 18, and 20 May 2008. Fits to the XRT spectra were made over the 0.5-10 keV band, assuming a column density of 2.4 E +21. The distance was assumed to be 6.8 kpc (Sidoli et al. 2004). The photon index ranged from 2.09 to 2.30, the unabsorbed flux ranged from 2.55 E-10 to 6.0 E-10 cgs, and the luminosity ranged from 1.1 E+36 to 3.4 E+36 erg/s.

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