Probing the high-energy properties of very early-type stars in the cluster HM1

Details Probing the high-energy properties of very early-type stars in the cluster HM1 Probing the high-energy properties of very early-type stars in the cluster HM1

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop....3n&link_type=abstract

XMM-Newton Proposal ID #06000801

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Stars, White Dwarfs, Solar System, Cl Hm 1

Scientific paper

So far, little information has been gathered on the X-ray emission of the earliest O-type stars. To probe their high-energy properties, we propose to observe the young cluster HM1 for the first time in the X-ray domain. Due to its high extinction, this object is notoriously difficult to observe at other wavelengths and it has thus been poorly studied up to now. However, observing HM1 provides access to 5 very early O stars, 2 WRs, and about 20 late O/early B objects. HM1 therefore allows a study of the L_X-L_{BOL} relation of the earliest spectral types and constitutes a unique probe into the X-ray emission of WN stars and early O stars. In addition, new magnetic or colliding wind objects will be detected, as well as part of the PMS population of HM1.

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