Pulsating Hot Subdwarfs in Omega Centauri
link https://repositorio.uc.cl/handle/11534/81272account_box Randall, S. K.account_box Calamida, A.account_box Fontaine, G.account_box Monelli, M.account_box Bono, G.account_box Alonso, M. L.account_box Van Grootel, V.account_box Brassard, P.account_box Chayer, P.account_box Catelan , Marcioaccount_box Littlefair, S.account_box Dhillon, V. S.account_box Marsh, T. R.
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We recently discovered the first globular cluster hot subdwarf pulsators in Omega Centauri (ω Cen). These stars were initially thought to belong to the class of rapidly pulsating subdwarf B stars, which are well established among the field star population and have become showcases for asteroseismology. However, our spectroscopic analysis revealed the ω Cen variables to be significantly hotter than expected, indicating that they form a new class of subdwarf O pulsators clustered around 50 000 K, not known among the field star population. Non-adiabatic pulsation modelling suggests that the driver for the pulsations occurs via the same iron opacity mechanism that is at work in the rapidly pulsating subdwarf B stars....
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| Autor | Randall, S. K. Calamida, A. Fontaine, G. Monelli, M. Bono, G. Alonso, M. L. Van Grootel, V. Brassard, P. Chayer, P. Catelan , Marcio Littlefair, S. Dhillon, V. S. Marsh, T. R. |
| Título | Pulsating Hot Subdwarfs in Omega Centauri |
| Fecha de publicación | 2016 |
| Resumen | We recently discovered the first globular cluster hot subdwarf pulsators in Omega Centauri (ω Cen). These stars were initially thought to belong to the class of rapidly pulsating subdwarf B stars, which are well established among the field star population and have become showcases for asteroseismology. However, our spectroscopic analysis revealed the ω Cen variables to be significantly hotter than expected, indicating that they form a new class of subdwarf O pulsators clustered around 50 000 K, not known among the field star population. Non-adiabatic pulsation modelling suggests that the driver for the pulsations occurs via the same iron opacity mechanism that is at work in the rapidly pulsating subdwarf B stars.... |
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