Article (Scientific journals)
Quasi-simultaneous XMM-Newton and VLA observation of the non-thermal radio emitter HD 168112 (O5.5III(f+))
De Becker, Michaël; Rauw, Grégor; Blomme, Ronny et al.
2004In Astronomy and Astrophysics, 420, p. 1061-1077
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Keywords :
radiation mechanisms: non-thermal; stars: early-type,; X-rays: stars; radio continuum: stars; stars: individual: HD 168112
Abstract :
[en] We report the results of a multiwavelength study of the non-thermal radio emitter HD 168112 (O5.5III(f+)). The detailed analysis of two quasi-simultaneous XMM-Newton and VLA observations reveals strong variability of this star both in the X-ray and radio ranges. The X-ray observations separated by five months reveal a decrease of the X-ray flux of ˜30%. The radio emission on the other hand increases by a factor 5-7 between the two observations obtained roughly simultaneously with the XMM-Newton pointings. The X-ray data reveal a hard emission that is most likely produced by a thermal plasma at kT ˜ 2-3 keV while the VLA data confirm the non-thermal status of this star in the radio waveband. Comparison with archive X-ray and radio data confirms the variability of this source in both wavelength ranges over a yet ill defined time scale. The properties of HD 168112 in the X-ray and radio domain point towards a binary system with a significant eccentricity and an orbital period of a few years. However, our optical spectra reveal no significant changes of the star's radial velocity suggesting that if HD 168112 is indeed a binary, it must be seen under a fairly low inclination.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Blomme, Ronny;  Royal Observatory of Belgium
Waldron, Wayne;  L-3 Communications Government Services
Sana, Hugues;  European Southern Observatory
Pittard, Julian;  University of Leeds > Department of Physics and Astronomy
Eenens, Philippe;  Universidad de Guanajuato > Departamento de Astronomia
Stevens, Ian Robert;  University of Birmingham
Runacres, Mark;  Vrije Universiteit Brussel - VUB
Van Loo, Sven;  University of Leeds > Department of Physics and Astronomy
Pollock, Andy;  ESA/Vilspa
Language :
English
Title :
Quasi-simultaneous XMM-Newton and VLA observation of the non-thermal radio emitter HD 168112 (O5.5III(f+))
Publication date :
June 2004
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
420
Pages :
1061-1077
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 December 2008

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