XMM-Newton Proposal 02072301

Details XMM-Newton Proposal 02072301 XMM-Newton Proposal 02072301

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..367a&link_type=abstract

XMM-Newton Proposal ID #02072301

Computer Science

Hd49798, Xmm-Newton Proposal 02072301

Scientific paper

RXJ0648.0-4418 is a pulsating soft X-ray source in a binary containing a hydrogen depleted subdwarf O6 star, HD49798. It is currently unclear whether this compact X-ray source is a NS or a white WD. In either case it corresponds to a previously unobserved evolutionary stage of a massive binary system, after common envelope and spiral-in. This source was already observed in 2 short observations as part of the EPIC GT and gave interesting results on the (pulse and orbital phase resolved) spectral analysis. We propose a 100ks observation to follow the system for a large fraction (75%) of its orbital period. This observation will yield the first measurement of M_c/M_x and will give a deeper insight into the spectral variability of this unique binary system.

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