X-RAY OBSERVATIONS OF BOW SHOCKS AROUND RUNAWAY O STARS. THE CASE OF zeta OPH AND BD+43 degrees 3654
- 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 zeta Oph by Chandra and Suzaku and of BD+43 degrees 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 zeta Oph. After a careful analysis of its spectral characteristics, we conclude that this emission has a thermal nature with a plasma temperature of T approximate to 2 x 10(6) 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 degrees 3654 is puzzling, as non-thermal emission has been reported in a previous work for this source.
Author details: | Jesús Alberto ToalaORCiD, Lidia M. OskinovaORCiDGND, Ana Gonzalez-Galan, Martín A. GuerreroORCiD, R. Ignace, Martin PohlORCiDGND |
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DOI: | https://doi.org/10.3847/0004-637X/821/2/79 |
ISSN: | 0004-637X |
ISSN: | 1538-4357 |
Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
Publisher: | IOP Publ. Ltd. |
Place of publishing: | Bristol |
Publication type: | Article |
Language: | English |
Year of first publication: | 2016 |
Publication year: | 2016 |
Release date: | 2020/03/22 |
Tag: | stars: individual (zeta Oph, BD+43 degrees 3654); stars: winds, outflows |
Volume: | 821 |
Number of pages: | 9 |
Funding institution: | Spanish MICINN (Ministerio de Ciencia e Innnovacion) [AYA 2014-57280-P]; ISM-SPP DFG Priority Program [1573]; National Aeronautics and Space Administration through Chandra Award [G03-14008X]; National Aeronautics Space Administration [NAS8-03060] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer review: | Referiert |