Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars
Most radiation-driven winds of massive stars can be modelled with m-CAK theory, resulting in the so-called fast solution. However, the most rapidly rotating stars among them, especially when the rotational speed is higher than ∼75 per cent of the critical rotational speed, can adopt a different solu...
| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2018
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93912 https://academic.oup.com/mnras/article/477/1/755/4975263 https://ri.conicet.gov.ar/handle/11336/82696 |
| Aporte de: |
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I19-R120-10915-93912 |
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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 |
Astronomía hydrodynamics stars: early-type stars: rotation stars: winds, outflows |
| spellingShingle |
Astronomía hydrodynamics stars: early-type stars: rotation stars: winds, outflows Araya, I. Curé, Michel Doula, A. ud Santillán, A. Cidale, Lydia Sonia Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| topic_facet |
Astronomía hydrodynamics stars: early-type stars: rotation stars: winds, outflows |
| description |
Most radiation-driven winds of massive stars can be modelled with m-CAK theory, resulting in the so-called fast solution. However, the most rapidly rotating stars among them, especially when the rotational speed is higher than ∼75 per cent of the critical rotational speed, can adopt a different solution, the so-called Ω-slow solution, characterized by a dense and slow wind. Here, we study the transition region of the solutions where the fast solution changes to the Ω-slow solution. Using both time-steady and time-dependent numerical codes, we study this transition region for various equatorial models of B-type stars. In all cases, in a certain range of rotational speeds we find a region where the fast and the Ω-slow solution can coexist. We find that the type of solution obtained in this co-existence region depends stongly on the initial conditions of our models. We also test the stability of the solutions within the co-existence region by performing base-density perturbations in the wind. We find that under certain conditions, the fast solution can switch to the Ω-slow solution, or vice versa. Such solution-switching may be a possible contributor of material injected into the circumstellar environment of Be stars, without requiring rotational speeds near critical values. |
| format |
Articulo Articulo |
| author |
Araya, I. Curé, Michel Doula, A. ud Santillán, A. Cidale, Lydia Sonia |
| author_facet |
Araya, I. Curé, Michel Doula, A. ud Santillán, A. Cidale, Lydia Sonia |
| author_sort |
Araya, I. |
| title |
Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| title_short |
Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| title_full |
Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| title_fullStr |
Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| title_full_unstemmed |
Co-existence and switching between fast and Ω-slow wind solutions in rapidly rotating massive stars |
| title_sort |
co-existence and switching between fast and ω-slow wind solutions in rapidly rotating massive stars |
| publishDate |
2018 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93912 https://academic.oup.com/mnras/article/477/1/755/4975263 https://ri.conicet.gov.ar/handle/11336/82696 |
| work_keys_str_mv |
AT arayai coexistenceandswitchingbetweenfastandōslowwindsolutionsinrapidlyrotatingmassivestars AT curemichel coexistenceandswitchingbetweenfastandōslowwindsolutionsinrapidlyrotatingmassivestars AT doulaaud coexistenceandswitchingbetweenfastandōslowwindsolutionsinrapidlyrotatingmassivestars AT santillana coexistenceandswitchingbetweenfastandōslowwindsolutionsinrapidlyrotatingmassivestars AT cidalelydiasonia coexistenceandswitchingbetweenfastandōslowwindsolutionsinrapidlyrotatingmassivestars |
| bdutipo_str |
Repositorios |
| _version_ |
1764820491947737091 |