Loading...
Please wait, while we are loading the content...
Similar Documents
X-ray spectral diagnostics of activity in massive stars
| Content Provider | Scilit |
|---|---|
| Author | Cohen, David H. Wollman, Emma E. Leutenegger, Maurice A. |
| Copyright Year | 2010 |
| Description | X-rays give direct evidence of instabilities, time-variable structure, and shock heating in the winds of O stars. The observed broad X-ray emission lines provide information about the kinematics of shock-heated wind plasma, enabling us to test wind-shock models. And their shapes provide information about wind absorption, and thus about the wind mass-loss rates. Mass-loss rates determined from X-ray line profiles are not sensitive to density-squared clumping effects, and indicate mass-loss rate reductions of factors of 3 to 6 over traditional diagnostics that suffer from density-squared effects. Broad-band X-ray spectral energy distributions also provide mass-loss rate information via soft X-ray absorption signatures. In some cases, the degree of wind absorption is so high, that the hardening of the X-ray SED can be quite significant. We discuss these results as applied to the early O stars ζ Pup (O4 If), 9 Sgr (O4 V((f))), and HD 93129A (O2 If*). |
| Related Links | http://arxiv.org/abs/1009.5669 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/B7B2CCF3CE8F599D516DD33E6831152F/S1743921311010763a.pdf/div-class-title-x-ray-spectral-diagnostics-of-activity-in-massive-stars-div.pdf |
| Ending Page | 353 |
| Page Count | 6 |
| Starting Page | 348 |
| ISSN | 17439213 |
| e-ISSN | 17439221 |
| DOI | 10.1017/s1743921311010763 |
| Journal | Proceedings of the International Astronomical Union |
| Issue Number | S272 |
| Volume Number | 6 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2010-07-01 |
| Access Restriction | Open |
| Subject Keyword | Proceedings of the International Astronomical Union Astronomy and Astrophysics Formation Shock Waves Winds rays |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
