XMM-Newton Proposal 02056301

Details XMM-Newton Proposal 02056301 XMM-Newton Proposal 02056301

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..294g&link_type=abstract

XMM-Newton Proposal ID #02056301

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Wr 21A, Xmm-Newton Proposal 02056301

Scientific paper

We propose to observe WR21a (O3If*/WN6). This star has an O3If* spectrum exhibiting a few Wolf-Rayet features. It could be single star, thus very extreme, or a binary system with a WN6 companion or with another O star. Its X-ray brightness is comparable to the one of WR140(a WR+O colliding wind binary) and of WR25 (a suspected one). A hard component is present in the X-ray spectrum but its origin is not established yet. It could well be either a non-thermal component or a colliding wind interaction. The choice between the two possibilities can be made on the basis of XMM spectroscopy (RGS). Therefore, we propose to study the X-ray emission of this rare and extreme object in order to determine its nature.

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