The Nature of the Supersoft X-Ray Source RXJ0439.8-6809

Details The Nature of the Supersoft X-Ray Source RXJ0439.8-6809 The Nature of the Supersoft X-Ray Source RXJ0439.8-6809

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop....4v&link_type=abstract

Chandra Proposal ID #01300181

Physics

Chandra Proposal Id #01300181

Scientific paper

The supersoft X-ray source RXJ0439.8-6809 is either the hottest known pre-white dwarf or an accreting double-degenerate white-dwarf binary. In the first case, RXJ0439.8-6809 puts strong constraints on the evolution of post-AGB stars; in the second case, it may have the shortest orbital period among all known accreting binaries. We propose to obtain a 40 ksec HRC-S+LETG observation, which will accurately determine the nature of the X-ray spectrum and the corresponding physical parameters, provide an accurate Rayleigh-Jeans extrapolation necessary to interprete the scheduled HST observations, possibly prove the white-dwarf nature of the X-ray source by detecting NeVIII absorption edges, and at best detect the predicted orbital period of a few minutes.

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