Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines

We compute non-LTE Mg II line profiles for Be stars by considering 12 energy-level atoms and supposing that the circumstellar medium can be described by an expanding, spherically symmetric flow in which we assume the presence of a chromosphere. The line radiative transfer equation was solved rigorou...

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Detalles Bibliográficos
Autor principal: Cidale, Lydia Sonia
Formato: Articulo
Lenguaje:Inglés
Publicado: 1998
Materias:
Ciencias Astronómicas
estrellas
circumstellar matter; radiative transfer; emission line; Be stars; mass loss
astrofísica
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/2087
http://iopscience.iop.org/article/10.1086/305918
Aporte de:
Aportado por : SEDICI (UNLP) de Universidad Nacional de La Plata .
id I19-R120-10915-2087
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spelling I19-R120-10915-20872021-04-24T04:05:09Z http://sedici.unlp.edu.ar/handle/10915/2087 http://iopscience.iop.org/article/10.1086/305918 issn:0004-637X Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines Cidale, Lydia Sonia 1998 2010-10-04T03:00:00Z en Ciencias Astronómicas estrellas circumstellar matter; radiative transfer; emission line; Be stars; mass loss astrofísica We compute non-LTE Mg II line profiles for Be stars by considering 12 energy-level atoms and supposing that the circumstellar medium can be described by an expanding, spherically symmetric flow in which we assume the presence of a chromosphere. The line radiative transfer equation was solved rigorously in spherical coordinates and in the comoving frame. The Mg II line profiles predicted by this model coincide with those observed in some Be stars. The calculation was performed for a range of effective temperatures representative of the B spectral type. We have also analyzed the influence on the line profiles of different temperature and velocity distributions in the circumstellar material. The line spectrum variability of a Be star is interpreted as the result of a variable outward mass flux. Facultad de Ciencias Astronómicas y Geofísicas Articulo Articulo http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf 824-832
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
estrellas
circumstellar matter; radiative transfer; emission line; Be stars; mass loss
astrofísica
spellingShingle Ciencias Astronómicas
estrellas
circumstellar matter; radiative transfer; emission line; Be stars; mass loss
astrofísica
Cidale, Lydia Sonia
Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
topic_facet Ciencias Astronómicas
estrellas
circumstellar matter; radiative transfer; emission line; Be stars; mass loss
astrofísica
description We compute non-LTE Mg II line profiles for Be stars by considering 12 energy-level atoms and supposing that the circumstellar medium can be described by an expanding, spherically symmetric flow in which we assume the presence of a chromosphere. The line radiative transfer equation was solved rigorously in spherical coordinates and in the comoving frame. The Mg II line profiles predicted by this model coincide with those observed in some Be stars. The calculation was performed for a range of effective temperatures representative of the B spectral type. We have also analyzed the influence on the line profiles of different temperature and velocity distributions in the circumstellar material. The line spectrum variability of a Be star is interpreted as the result of a variable outward mass flux.
format Articulo
Articulo
author Cidale, Lydia Sonia
author_facet Cidale, Lydia Sonia
author_sort Cidale, Lydia Sonia
title Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
title_short Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
title_full Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
title_fullStr Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
title_full_unstemmed Diagnosis of stellar winds and temperature structures in Be stars through the analysis of Mg II lines
title_sort diagnosis of stellar winds and temperature structures in be stars through the analysis of mg ii lines
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/2087
http://iopscience.iop.org/article/10.1086/305918
work_keys_str_mv AT cidalelydiasonia diagnosisofstellarwindsandtemperaturestructuresinbestarsthroughtheanalysisofmgiilines
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