X-Ray Observations of Bow Shocks around Runaway O Stars. The Case of ζ Oph and BD+43°3654

DOI: 
10.3847/0004-637X/821/2/79
Publication date: 
01/04/2016
Main author: 
Toalá, J. A.
IAA authors: 
Toalá, J. A.;Guerrero, M. A.
Authors: 
Toalá, J. A.;Oskinova, L. M.;González-Galán, A.;Guerrero, M. A.;Ignace, R.;Pohl, M.
Journal: 
The Astrophysical Journal
Publication type: 
Article
Volume: 
821
Pages: 
79
Abstract: 
Non-thermal radiation has been predicted within bow shocks around runaway stars by recent theoretical works. We present X-ray observations toward the runaway stars ζ Oph by Chandra and Suzaku and of BD+43°3654 by XMM-Newton to search for the presence of non-thermal X-ray emission. We found no evidence of non-thermal emission spatially coincident with the bow shocks; nonetheless, diffuse emission was detected in the vicinity of ζ Oph. After a careful analysis of its spectral characteristics, we conclude that this emission has a thermal nature with a plasma temperature of T ≈ 2 × 10<SUP>6</SUP> K. The cometary shape of this emission seems to be in line with recent predictions of radiation-hydrodynamic models of runaway stars. The case of BD+43°3654 is puzzling, as non-thermal emission has been reported in a previous work for this source.
Database: 
ADS
SCOPUS
SCOPUS
WOK
URL: 
https://ui.adsabs.harvard.edu/#abs/2016ApJ...821...79T/abstract
ADS Bibcode: 
2016ApJ...821...79T
Keywords: 
stars: individual: ζ Oph;BD+43°3654;stars: winds;outflows