An exceptional X-ray view of the young open cluster NGC 6231: what XMM-Newton has taught us

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dc.creatorSana, H.
dc.creatorGosset, E.
dc.creatorRauw, G.
dc.creatorVreux, J. -M.
dc.date2005-11-24
dc.date.accessioned2026-07-07T06:45:20Z
dc.date.available2026-07-07T06:45:20Z
dc.descriptionConsidered as the core of the Sco OB1 association, the young open cluster NGC 6231 harbours a rich O-type star population. In 2001, the XMM-Newton satellite targeted the cluster for a nominal duration of about 180 ks. Thanks to the detector sensitivity, the EPIC cameras provided an unprecedented X-ray view of NGC 6231, revealing about 600 point-like sources. In this contribution, we review the main results that have been obtained thanks to this unprecedented data set. Concerning the O-type stars, we present the latest developments related to the so-called 'canonical' Lx-Lbol relation. The dispersion around this relation might actually be much smaller than previously thought. In our data set, the sole mechanism that yields a significant deviation from this scheme is wind interaction. It is also the sole mechanism that induces a significant variation of the early-type star X-ray flux. In a second part of this contribution, we probe the properties of the optically faint X-ray sources. Most of them are believed to be low mass pre-main sequence stars. Their analysis provides direct insight into the star formation history of the cluster.
dc.description6 pages, 5 figures, to appear in "The X-Ray Universe 2005", ESA Symposium held at El Escorial, Madrid (Spain), 26-30 Sep 2005
dc.identifierhttps://arxiv.org/abs/astro-ph/0511700
dc.identifierhttp://arxiv.org/abs/astro-ph/0511700
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/103018
dc.subjectAstrophysics
dc.titleAn exceptional X-ray view of the young open cluster NGC 6231: what XMM-Newton has taught us
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