Oscillatory secular modes: The thermal micropulses
Aims. Stars in the narrow mass range of about 2.5 and 3.5 M ⊙ can develop a thermally unstable He-burning shell during its ignition phase. We study, from the point of view secular stability theory, these so-called thermal micropulses and investigate their properties; the thermal pulses constitute a...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2007
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83151 |
| Aporte de: |
| id |
I19-R120-10915-83151 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Stars: AGB and post-AGB Stars: interiors Stars: oscillations |
| spellingShingle |
Ciencias Astronómicas Stars: AGB and post-AGB Stars: interiors Stars: oscillations Gautschy, A. Althaus, Leandro Gabriel Oscillatory secular modes: The thermal micropulses |
| topic_facet |
Ciencias Astronómicas Stars: AGB and post-AGB Stars: interiors Stars: oscillations |
| description |
Aims. Stars in the narrow mass range of about 2.5 and 3.5 M ⊙ can develop a thermally unstable He-burning shell during its ignition phase. We study, from the point of view secular stability theory, these so-called thermal micropulses and investigate their properties; the thermal pulses constitute a convenient conceptual laboratory to look thoroughly into the physical properties of a helium-burning shell during the whole thermally pulsing episode. Methods. Linear stability analyses were performed on a large number of 3 M⊙ star models toward the end of their core helium-burning and the beginning of the double shell burning phase. The stellar models were not assumed to be in thermal equilibrium. Results. The thermal mircopulses - and we conjecture all other thermal pulse episodes encountered by shell burning stars - can be understood as the nonlinear finite-amplitude realization of an oscillatory secular instability that prevails during the whole thermal pulsing episode. Hence, the cyclic nature of the thermal pulses can be traced back to a linear instability concept. |
| format |
Articulo Articulo |
| author |
Gautschy, A. Althaus, Leandro Gabriel |
| author_facet |
Gautschy, A. Althaus, Leandro Gabriel |
| author_sort |
Gautschy, A. |
| title |
Oscillatory secular modes: The thermal micropulses |
| title_short |
Oscillatory secular modes: The thermal micropulses |
| title_full |
Oscillatory secular modes: The thermal micropulses |
| title_fullStr |
Oscillatory secular modes: The thermal micropulses |
| title_full_unstemmed |
Oscillatory secular modes: The thermal micropulses |
| title_sort |
oscillatory secular modes: the thermal micropulses |
| publishDate |
2007 |
| url |
http://sedici.unlp.edu.ar/handle/10915/83151 |
| work_keys_str_mv |
AT gautschya oscillatorysecularmodesthethermalmicropulses AT althausleandrogabriel oscillatorysecularmodesthethermalmicropulses |
| bdutipo_str |
Repositorios |
| _version_ |
1764820488339587074 |