Colliding stellar winds structure and X-ray emission
| Autor: | Julian M. Pittard, B. Dawson |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Shock wave
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics 01 natural sciences Luminosity law.invention Momentum Primary (astronomy) law 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Physics::Atmospheric and Oceanic Physics Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics 010308 nuclear & particles physics X-ray Astronomy and Astrophysics Stellar wind Discontinuity (linguistics) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Physics::Space Physics Astrophysics - High Energy Astrophysical Phenomena Flare |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 477:5640-5645 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We investigate the structure and X-ray emission from the colliding stellar winds in massive star binaries. We find that the opening angle of the contact discontinuity (CD) is overestimated by several formulae in the literature at very small values of the wind momentum ratio. We find also that the shocks in the primary (dominant) and secondary winds flare by approx 20 degrees compared to the CD, and that the entire secondary wind is shocked when the wind momentum ratio < 0.02. Analytical expressions for the opening angles of the shocks, and the fraction of each wind that is shocked, are provided. We find that the X-ray luminosity scales with the wind momentum ratio, and that the spectrum softens slightly as the wind momentum ratio decreases. 6 pages, 3 figures, accepted by MNRAS |
| Databáze: | OpenAIRE |
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