Carina OB Stars: X-ray Signatures of Wind Shocks and Magnetic Fields

open clusters and associations: individual: Cl Bochum 10 Cl Bochum 11 Cl Collinder 228 Cl Trumpler 14 Cl Trumpler 15 Cl Trumpler 16; stars: early-type; stars: individual: HD 93250 HD 93129A HD 93403 HD 93205 HD 93343 QZ Car SS73 24 FO 15 Cl Trumpler 16 22 CPD-59 2610 HD 93501; X-rays: stars

Abstract :

[en] The Chandra Carina Complex contains 200 known O- and B-type stars. The Chandra survey detected 68 of the 70 O stars and 61 of 127 known B0-B3 stars. We have assembled a publicly available optical/X-ray database to identify OB stars that depart from the canonical L [SUB]X[/SUB]/L [SUB]bol[/SUB] relation or whose average X-ray temperatures exceed 1 keV. Among the single O stars with high kT we identify two candidate magnetically confined wind shock sources: Tr16-22, O8.5 V, and LS 1865, O8.5 V((f)). The O4 III(fc) star HD 93250 exhibits strong, hard, variable X-rays, suggesting that it may be a massive binary with a period of >30 days. The visual O2 If* binary HD 93129A shows soft 0.6 keV and hard 1.9 keV emission components, suggesting embedded wind shocks close to the O2 If* Aa primary and colliding wind shocks between Aa and Ab. Of the 11 known O-type spectroscopic binaries, the long orbital-period systems HD 93343, HD 93403, and QZ Car have higher shock temperatures than short-period systems such as HD 93205 and FO 15. Although the X-rays from most B stars may be produced in the coronae of unseen, low-mass pre-main-sequence companions, a dozen B stars with high L [SUB]X[/SUB] cannot be explained by a distribution of unseen companions. One of these, SS73 24 in the Treasure Chest cluster, is a new candidate Herbig Be star.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Gagné, Marc; Department of Geology and Astronomy, West Chester University, West Chester, PA 19383, USA

Fehon, Garrett; Department of Geology and Astronomy, West Chester University, West Chester, PA 19383, USA

Savoy, Michael R; Department of Geology and Astronomy, West Chester University, West Chester, PA 19383, USA

Cohen, David H; Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081, USA

Townsley, Leisa K; Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA

Broos, Patrick S; Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA

Povich, Matthew S; Department of Astronomy & Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802, USA ; NSF Astronomy and Astrophysics Postdoctoral Fellow.

Corcoran, Michael F; CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA

Walborn, Nolan R; Space Telescope Science Institute, Baltimore, MD 21218, USA

Remage Evans, Nancy; Smithsonian Astrophysical Observatory, MS 4, 60 Garden St., Cambridge, MA 02138, USA

More authors (3 more)

Language :

English

Title :

Carina OB Stars: X-ray Signatures of Wind Shocks and Magnetic Fields

Publication date :

01 May 2011

Journal title :

Astrophysical Journal Supplement Series

ISSN :

0067-0049

eISSN :

1538-4365

Publisher :

Univ Chicago Press, Chicago, United States - Illinois

Volume :

194

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://cdsads.u-strasbg.fr/abs/2011ApJS..194....5G

Commentary :

http://de.arxiv.org/abs/1103.1149

Available on ORBi :

since 22 September 2011

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