The true nature of HD 110432: the most extreme gamma Cas analog

Details The true nature of HD 110432: the most extreme gamma Cas analog The true nature of HD 110432: the most extreme gamma Cas analog

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2545t&link_type=abstract

Chandra proposal ID #10200757

Computer Science

Scientific paper

We propose to use the high resolution capabilities of Chandra gratings to study the nature of the Be/X-ray source 1H1249-637=HD 110432, the most extreme of the known gamma Cas analogs. Two hypotheses have been put forward to explain the origin of the X-ray emission in these objects: a) accretion onto a compact object and b) emission from the star+disk interaction through stellar magnetic fields. Both of these challenge profoundly our current understanding of the structure of massive stars and/or how binary systems evolve. HD110432 displays extreme conditions within its class: the hottest plasma (> 20 keV), the hardest spectrum, an enormous circumstellar disk and a close to edge-on inclination.

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