Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi
Context. Runaway massive stars are O-and B-type stars with high spatial velocities with respect to the interstellar medium. These stars can produce bowshocks in the surrounding gas. Bowshocks develop as arc-shaped structures, with bows pointing to the same direction as the stellar velocity, while th...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2012
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84645 |
| Aporte de: |
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I19-R120-10915-84645 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Gamma rays: general ISM: jets and outflows Radiation mechanisms: non-thermal Stars: early-type Stars: individual:ζOphiuchi |
| spellingShingle |
Ciencias Astronómicas Gamma rays: general ISM: jets and outflows Radiation mechanisms: non-thermal Stars: early-type Stars: individual:ζOphiuchi Valle, María Elena del Romero, Gustavo Esteban Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| topic_facet |
Ciencias Astronómicas Gamma rays: general ISM: jets and outflows Radiation mechanisms: non-thermal Stars: early-type Stars: individual:ζOphiuchi |
| description |
Context. Runaway massive stars are O-and B-type stars with high spatial velocities with respect to the interstellar medium. These stars can produce bowshocks in the surrounding gas. Bowshocks develop as arc-shaped structures, with bows pointing to the same direction as the stellar velocity, while the star moves supersonically through the interstellar gas. The piled-up shocked matter emits thermal radiation and a population of locally accelerated relativistic particles is expected to produce non-thermal emission over a wide range of energies. Aims. We aim to model the non-thermal radiation produced in these sources. Methods. Under some assumptions, we computed the non-thermal emission produced by the relativistic particles and the thermal radiation caused by free-free interactions, for O4I and O9I stars. We applied our model to ζ Oph (HD 149757), an intensively studied massive star seen from the northern hemisphere. This star has spectral type O9.5V and is a well-known runaway. Results. Spectral energy distributions of massive runaways are predicted for the whole electromagnetic spectrum. Conclusions. We conclude that the non-thermal radiation might be detectable at various energy bands for relatively nearby runaway stars, especially at high-energy gamma rays. Inverse Compton scattering with photons from the heated dust gives the most important contribution to the high-energy spectrum. This emission approaches Fermi sensitivities in the case of ζ Oph. |
| format |
Articulo Articulo |
| author |
Valle, María Elena del Romero, Gustavo Esteban |
| author_facet |
Valle, María Elena del Romero, Gustavo Esteban |
| author_sort |
Valle, María Elena del |
| title |
Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| title_short |
Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| title_full |
Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| title_fullStr |
Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| title_full_unstemmed |
Non-thermal processes in bowshocks of runaway stars: Application to ζ Ophiuchi |
| title_sort |
non-thermal processes in bowshocks of runaway stars: application to ζ ophiuchi |
| publishDate |
2012 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84645 |
| work_keys_str_mv |
AT vallemariaelenadel nonthermalprocessesinbowshocksofrunawaystarsapplicationtozophiuchi AT romerogustavoesteban nonthermalprocessesinbowshocksofrunawaystarsapplicationtozophiuchi |
| bdutipo_str |
Repositorios |
| _version_ |
1764820489057861633 |