Letter to the editor (Scientific journals)
An XMM-Newton look at the Wolf-Rayet star WR 40 - The star itself, its nebula and its neighbours
Gosset, Eric; Nazé, Yaël; Claeskens, Jean-François et al.
2005In Astronomy and Astrophysics, 429 (2), p. 685-704
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Keywords :
stars : individual : WR 40; stars : early-type; stars : Wolf-Rayet; X-rays : stars; ISM : individual objects : RCW58; ISM : bubbles
Abstract :
[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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Gosset, Eric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Claeskens, Jean-François 
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophysique
Sana, H.
Language :
English
Title :
An XMM-Newton look at the Wolf-Rayet star WR 40 - The star itself, its nebula and its neighbours
Publication date :
January 2005
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
E D P Sciences, Les Ulis Cedex A, France
Volume :
429
Issue :
2
Pages :
685-704
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 February 2009

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