Reference : An XMM-Newton look at the Wolf-Rayet star WR 40 - The star itself, its nebula and its ne...
Scientific journals : Letter to the editor
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/5961
An XMM-Newton look at the Wolf-Rayet star WR 40 - The star itself, its nebula and its neighbours
English
Gosset, Eric 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) >]
Claeskens, Jean-François [> > > >]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Vreux, Jean-Marie mailto [Université de Liège - ULg > Département d'astrophysique]
Sana, H. [> > > >]
Jan-2005
Astronomy and Astrophysics
E D P Sciences
429
2
685-704
Yes (verified by ORBi)
International
0004-6361
Les Ulis Cedex A
[en] stars : individual : WR 40 ; stars : early-type ; stars : Wolf-Rayet ; X-rays : stars ; ISM : individual objects : RCW58 ; ISM : bubbles
[en] We present the results of an XMM-Newton observation of the field of the Wolf-Rayet star WR 40. Despite a nominal exposure of 20 ks and the high sensitivity of the satellite, the star itself is not detected: we thus derive an upper limit on its X-ray flux and luminosity. Joining this result to recent reports of a non-detection of some WC stars, we suggest that the X-ray emission from single normal Wolf-Rayet stars could often be insignificant despite remarkable instabilities in the wind. On the basis of a simple modelling of the opacity of the Wolf-Rayet wind of WR 40, we show that any X-ray emission generated in the particular zone where the shocks are supposed to be numerous will indeed have little chance to emerge from the dense wind of the Wolf-Rayet star. We also report the non-detection of the ejecta nebula RCW 58 surrounding WR 40. Concerning the field around these objects, we detected 33 X-ray sources, most of them previously unknown: we establish a catalog of these sources and cross-correlate it with catalogs of optical/infrared sources.
Researchers ; Professionals
http://hdl.handle.net/2268/5961
10.1051/0004-6361:20040286
http://adsabs.harvard.edu/abs/2005A%26A...429..685G

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