Bibcode
Garcia, M.; Callanan, P.
Bibliographical reference
American Astronomical Society, 187th AAS Meeting, #26.04; Bulletin of the American Astronomical Society, Vol. 27, p.1323
Advertised on:
12
1995
Citations
1
Refereed citations
1
Description
We report on the x-ray spectrum and lightcurve of the eclipsing Low-Mass
X-ray Binary (LMXB) 4U2129+47 as observed with the ROSAT PSPC during its
current quiescent state. Contrary to earlier indications with the ROSAT
HRI, the eclipse seen during the high state is still present. The
eclipse duration, amplitude, and the fraction of residual flux present
during the eclipse are all consistent with on-state (ie, Einstein IPC)
observations, but the statistics in the low-state data are poor. The low
state luminosity of ~ 5 x 10(33) ergs/sec and spectrum with kT ~ 0.3 keV
are consistent with that seen in other quiescent LMXB. The presence of
residual flux during the eclipse indicates that the x-ray source is
still extended in the quiescent state, as first discovered during high
state observations. If the high state model of an extended accretion
disk corona is applied to the quiescent state, then the mechanism which
creates the corona must be insensitive to the level of x-ray irradiation
from the central source.