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| Titel |
Effects of stellar evolution and ionizing radiation on the environments of massive stars |
| VerfasserIn |
J. Mackey, N. Langer, S. Mohamed, V. V. Gvaramadze, H. R. Neilson, D. M.-A. Meyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2199-3955
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| Digitales Dokument |
URL |
| Erschienen |
In: ASTRA Proceedings ; 1, no. 1 ; Nr. 1, no. 1 (2014-09-11), S.61-63 |
| Datensatznummer |
250115112
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| Publikation (Nr.) |
 copernicus.org/ap-1-61-2014.pdf |
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| Zusammenfassung |
| We discuss two important effects for the astrospheres of runaway stars: the
propagation of ionizing photons far beyond the astropause, and the rapid
evolution of massive stars (and their winds) near the end of their lives. Hot
stars emit ionizing photons with associated photoheating that has a
significant dynamical effect on their surroundings. 3-D simulations show that
H ii regions around runaway O stars drive expanding conical shells
and leave underdense wakes in the medium they pass through. For late O stars
this feedback to the interstellar medium is more important than that from
stellar winds. Late in life, O stars evolve to cool red supergiants more
rapidly than their environment can react, producing transient circumstellar
structures such as double bow shocks. This provides an explanation for the
bow shock and linear bar-shaped structure observed around Betelgeuse. |
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