U 2129+47: from Adios to Adaf or Isolated Neutron Star?

Details U 2129+47: from Adios to Adaf or Isolated Neutron Star? U 2129+47: from Adios to Adaf or Isolated Neutron Star?

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..585n&link_type=abstract

Chandra Proposal ID #02400631

Physics

Chandra Proposal Id #02400631

Scientific paper

4U2129+47 is one of the three original `Accretion Disk Corona' sources. The partial X-ray eclipses in these near edge-on systems imply that the X-ray emission must extend over radii a substantial fraction of the binary separation, possibly related to an outflow, as in models of `Adiabatic Inflow/Outflow' accretion. Since 1983 4U2129+47 has been in a protracted quiescent state. Two models exist for this state: `Advection Dominated Accretion' or thermal emission from the cooling surface of the neutron star. The latter would imply a sharp, total eclipse in the lightcurve. We propose a 38 ksec (two binary orbits) Chandra observation of 4U2129+47 which will test thermal emission models of the quiescent spectrum and determine whether any eclipse in the observed lightcurve is total or partial.

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