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On the stability of bow shocks generated by red supergiants: the case of IRC-10414статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 мая 2014 г.
- Авторы: M-A Meyer D., Gvaramadze V.V., Langer N., Mackey J., Boumis P., Mohamed S.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 439
- Номер: 1
- Год издания: 2014
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: L41
- Последняя страница: L45
- DOI: 10.1093/mnrasl/slt176
- Аннотация: In this Letter, we explore the hypothesis that the smooth appearance of bow shocks around some red supergiants (RSGs) might be caused by the ionization of their winds by external sources of radiation. Our numerical simulations of the bow shock generated by IRC-10414 (the first-ever RSG with an optically detected bow shock) show that the ionization of the wind results in its acceleration by a factor of two, which reduces the difference between the wind and space velocities of the star and makes the contact discontinuity of the bow shock stable for a range of stellar space velocities and mass-loss rates. Our best fit model reproduces the overall shape and surface brightness of the observed bow shock and suggests that the space velocity and mass-loss rate of IRC-10414 are \approx 50 km/s and \approx 10^{-6} Msun/yr, respectively, and that the number density of the local ISM is \approx 3 cm^{-3}. It also shows that the bow shock emission comes mainly from the shocked stellar wind. This naturally explains the enhanced nitrogen abundance in the line-emitting material, derived from the spectroscopy of the bow shock. We found that photoionized bow shocks are \approx 15-50 times brighter in optical line emission than their neutral counterparts, from which we conclude that the bow shock of IRC-10414 must be photoionized.
- Добавил в систему: Гварамадзе Василий Васильевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | MNRAS_18.pdf | 870,9 КБ | 4 марта 2014 [Gvaramadze] |