ASCA Observations of Soft X-Ray Transients in Quiescence : X1608-52 and CEN X-4

Details ASCA Observations of Soft X-Ray Transients in Quiescence : X1608-52 and CEN X-4 ASCA Observations of Soft X-Ray Transients in Quiescence : X1608-52 and CEN X-4

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..257a&link_type=abstract

Publications of the Astronomical Society of Japan, v.48, p.257-263.

Astronomy and Astrophysics

Astronomy

68

Stars: Neutron, X-Rays: Binaries, X-Rays: Sources, X-Rays: Transients

Scientific paper

We observed soft X-ray transients, X1608-52 and Cen X-4, in quiescence with ASCA at X-ray luminosities on the order of 10(32{--}33) erg s(-1) \ . The energy spectra were rather soft for both sources. Blackbody fits to the data required characteristic temperatures of 0.2--0.3 keV and emission regions of ~ 10 km(2) . A conspicuous hard tail remained after fitting Cen X-4 with a blackbody curve. An extremely soft spectrum in quiescence seems to be a common property of soft X-ray transients.

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