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The X-ray properties of magnetic massive stars

Published online by Cambridge University Press:  23 January 2015

Yaël Nazé ,
Véronique Petit ,
Melanie Rinbrand ,
David Cohen ,
Stan Owocki ,
Asif ud-Doula  and
Gregg Wade
Yaël Nazé
Affiliation:
FNRS/ULg, Dept AGO, Allée du 6 Août 17, B5C, 4000-Liège, Belgium email: naze@astro.ulg.ac.be
Véronique Petit
Affiliation:
Dept of Physics & Astronomy, Univ. of Delaware, Bartol Res. Inst., Newark, DE 19716, USA
Melanie Rinbrand
Affiliation:
Dept of Physics & Astronomy, Univ. of Delaware, Bartol Res. Inst., Newark, DE 19716, USA
David Cohen
Affiliation:
Dept of Physics & Astronomy, Swarthmore College, Swarthmore, PA 19081, USA
Stan Owocki
Affiliation:
Dept of Physics & Astronomy, Univ. of Delaware, Bartol Res. Inst., Newark, DE 19716, USA
Asif ud-Doula
Affiliation:
Penn State Worthington Scranton, Dunmore, PA 18512, USA
Gregg Wade
Affiliation:
Dept of Physics, RMC, PO Box 17000, Station Forces, Kingston, ON K7K 4B4, Canada
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Abstract

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Early-type stars are well-known to be sources of soft X-rays. However, this high-energy emission can be supplemented by bright and hard X-rays when magnetically confined winds are present. In an attempt to clarify the systematics of the observed X-ray properties of this phenomenon, a large series of Chandra and XMM observations was analyzed, over 100 exposures of 60% of the known magnetic massive stars listed recently by Petit et al. (2013). It is found that the X-ray luminosity is strongly correlated with mass-loss rate, in agreement with predictions of magnetically confined wind models, though the predictions of higher temperature are not always verified. We also investigated the behaviour of other X-ray properties (absorption, variability), yielding additional constraints on models. This work not only advances our knowledge of the X-ray emission of massive stars, but also suggests new observational and theoretical avenues to further explore magnetically confined winds.

Keywords

stars: early-typestars: magnetic fieldsX-rays: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 437 - 442
Copyright
Copyright © International Astronomical Union 2015 

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