Reference : An XMM-Newton observation of the Lagoon Nebula and the very young open cluster NGC 6530
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/2187
An XMM-Newton observation of the Lagoon Nebula and the very young open cluster NGC 6530
English
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Stevens, I. R. [> > > >]
Blomme, Ronny [Royal Observatory of Belgium]
Corcoran, M. F. [> > > >]
Pittard, J. M. [> > > >]
Runacres, M. C. [> > > >]
Nov-2002
Astronomy and Astrophysics
E D P Sciences
395
2
499-513
Yes (verified by ORBi)
International
0004-6361
Les Ulis Cedexa
[en] ISM : individual objects : M8 ; open clusters and associations : individual : NGC6530 ; stars : early-type ; stars : pre-main sequence ; X-rays : stars
[en] We report the results of an XMM-Newton observation of the Lagoon Nebula (M8). Our EPIC images of this region reveal a cluster of point sources, most of which have optical counterparts inside the very young open cluster NGC6530. The bulk of these X-ray sources are probably associated with low and intermediate mass pre-main sequence stars. One of the sources experienced a flare-like increase of its X-ray flux making it the second brightest source in M8 after the O4 star 9 Sgr. The X-ray spectra of most of the brightest sources can be fitted with thermal plasma models with temperatures of kT similar to a few keV. Only a few of the X-ray selected PMS candidates are known to display Halpha emission and were previously classified as classical T Tauri stars. This suggests that most of the X-ray emitting PMS stars in NGC6530 are weak-line T Tauri stars. In addition to 9 Sgr, our EPIC field of view contains also a few early-type stars. The X-ray emission from HD 164816 is found to be typical for an O9.5 III-IV star. At least one of the known Herbig Be stars in NGC6530 ( LkHalpha 115) exhibits a relatively strong X-ray emission, while most of the main sequence stars of spectral type B1 and later are not detected. We also detect ( probably) diffuse X-ray emission from the Hourglass Region that might reveal a hot bubble blown by the stellar wind of Herschel 36, the ionizing star of the Hourglass Region.
Researchers
http://hdl.handle.net/2268/2187
10.1051/0004-6361:20021230
http://wela.astro.ulg.ac.be/Preprints/P76/index.html

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