An XMM-Newton view of the young open cluster NGC 6231
نویسندگان
چکیده
منابع مشابه
An XMM–Newton view of the young open cluster NGC 6231 – II. The OB star population
In this second paper of the series, we pursue the analysis of the 180-ks XMM–Newton campaign towards the young open cluster NGC 6231 and we focus on its rich OB star population. We present a literature-based census of the OB stars in the field of view with more than one hundred objects, among which 30 per cent can be associated with an X-ray source. All the O-type stars are detected in the X-ra...
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This paper is the first of a series dedicated to the X-ray properties of the young open cluster NGC 6231. Our data set relies on an XMM-Newton campaign of a nominal duration of 180 ks and reveals that NGC 6231 is very rich in the X-ray domain too. Indeed, 610 X-ray sources are detected in the present field of view, centered on the cluster core. The limiting sensitivity of our survey is approxim...
متن کاملAn XMM-Newton view of the young open cluster NGC 6231⋆ III. Optically faint X-ray sources
We discuss the properties of the X-ray sources with faint optical counterparts in the very young open cluster NGC 6231. From their positions in the H-R diagram, we find that the bulk of these objects probably consists of low-mass pre-main sequence stars with masses in the range 0.3 to 3.0M⊙. The age distribution of these objects indicates that low-mass star formation in NGC6231 started more tha...
متن کاملAn Exceptional X-ray View of the Young Open Cluster Ngc 6231: What Xmm-newton Has Taught Us
Considered 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...
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We report on XMM–Newton observations of the young open cluster NGC 2547 which allow us to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission is seen from stars at all spectral types, peaking among G stars at luminosities (0.3–3 keV) of L x 1030.5 erg s−1 and declining to L x 1029.0 erg s−1 among M stars with masses 0.2 M . Coronal spe...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20053224