Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes
We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equat...
| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2014
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/137673 |
| Aporte de: |
| id |
I19-R120-10915-137673 |
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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 Stars: magnetic field Stars: chemically peculiar Stars: early-type Stars: atmospheres Line: profiles |
| spellingShingle |
Astronomía Stars: magnetic field Stars: chemically peculiar Stars: early-type Stars: atmospheres Line: profiles Vallverdú, Rodolfo Enrique Cidale, Lydia Sonia Rohrmann, René D. Ringuelet, Adela Emilia Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| topic_facet |
Astronomía Stars: magnetic field Stars: chemically peculiar Stars: early-type Stars: atmospheres Line: profiles |
| description |
We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes.
We consider a photosphere in local thermodynamic and hydrostatic equilibrium. The hydrostatic equilibrium equation is modified to include the Lorentz force. Atomic occupational numbers are computed in LTE considering non-ideal effects in the gas equation of state.
We depict the influence of a magnetic field on local He I line profiles and discuss the effects of the helium abundance in magnetic B-type stars. The Lorentz force might explain local variations up to 7 % in the equivalent width of helium lines, while local enhancements of He chemical abundances would produce larger changes. To analyze the line variations in real stars we computed the net contribution of a bipolar magnetic field over the stellar disk. The resulting disk-averaged magnetic field predicts variations with the rotation phase up to 2–3 % in the line EWs for a dipolar magnetic field of 1000 G. |
| format |
Articulo Articulo |
| author |
Vallverdú, Rodolfo Enrique Cidale, Lydia Sonia Rohrmann, René D. Ringuelet, Adela Emilia |
| author_facet |
Vallverdú, Rodolfo Enrique Cidale, Lydia Sonia Rohrmann, René D. Ringuelet, Adela Emilia |
| author_sort |
Vallverdú, Rodolfo Enrique |
| title |
Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| title_short |
Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| title_full |
Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| title_fullStr |
Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| title_full_unstemmed |
Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes |
| title_sort |
atmospheric models of he-peculiar stars: synthetic he i line profiles and absolute visual magnitudes |
| publishDate |
2014 |
| url |
http://sedici.unlp.edu.ar/handle/10915/137673 |
| work_keys_str_mv |
AT vallverdurodolfoenrique atmosphericmodelsofhepeculiarstarssyntheticheilineprofilesandabsolutevisualmagnitudes AT cidalelydiasonia atmosphericmodelsofhepeculiarstarssyntheticheilineprofilesandabsolutevisualmagnitudes AT rohrmannrened atmosphericmodelsofhepeculiarstarssyntheticheilineprofilesandabsolutevisualmagnitudes AT ringueletadelaemilia atmosphericmodelsofhepeculiarstarssyntheticheilineprofilesandabsolutevisualmagnitudes |
| bdutipo_str |
Repositorios |
| _version_ |
1764820457306980352 |