Chandra Observations of the Low Mass X-ray Binary 4U 1556-60

Details Chandra Observations of the Low Mass X-ray Binary 4U 1556-60 Chandra Observations of the Low Mass X-ray Binary 4U 1556-60

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2714c&link_type=abstract

Chandra proposal ID #10400071

Computer Science

Scientific paper

4U 1556-60 is a LMXB in a 9.1 hour orbit, that has been identified (based upon its X-ray colors) as an atoll source, although no bursts have been identified to secure its classification as a neutron star. Spectrally, models that consist of an accretion disk plus a Compton corona, or models that consist of a black body (e.g., neutron star surface emission) plus a hard, but very exponentially cutoff tail, both seem to fit BeppoSAX data equally well. Here we propose to view this system, for nearly one full binary orbit, with the Chandra HETG. We hope to better gauge whether the bulk of the soft emission is coming from a neutron star surface, or the atmosphere of a Comptonized accretion disk.

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