Mass loss rate determinations of southern OB stars

A sample of OB stars (eleven Of, one O and one B supergiant) has been surveyed with the Australia Telescope Compact Array at 4.8 and 8.64 GHz with a resolution of ∼2"–4". Five stars were detected; three of them have negative spectral indices, consistent with non-thermal emission, and two h...

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Detalles Bibliográficos
Autores principales: Benaglia, Paula, Cappa, Cristina Elisabet, Koribalski, B. S.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
stars: early-type
stars: mass loss
stars: winds, outflows
radio continuum: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123953
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123953
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: early-type
stars: mass loss
stars: winds, outflows
radio continuum: stars
spellingShingle Ciencias Astronómicas
stars: early-type
stars: mass loss
stars: winds, outflows
radio continuum: stars
Benaglia, Paula
Cappa, Cristina Elisabet
Koribalski, B. S.
Mass loss rate determinations of southern OB stars
topic_facet Ciencias Astronómicas
stars: early-type
stars: mass loss
stars: winds, outflows
radio continuum: stars
description A sample of OB stars (eleven Of, one O and one B supergiant) has been surveyed with the Australia Telescope Compact Array at 4.8 and 8.64 GHz with a resolution of ∼2"–4". Five stars were detected; three of them have negative spectral indices, consistent with non-thermal emission, and two have positive indices. The thermal radiation from HD 150135 and HD 163181 can be explained as coming from an optically thick ionized stellar wind. The non-thermal radiation from CD–47◦ 4551, HD 124314 and HD 150136 possibly comes from strong shocks in the wind itself and/or in the wind colliding region if the stars have a massive early-type companion. The percentage of non-thermal emitters among detected O stars has increased up to ∼50%. The Of star HD 124314 clearly shows flux density variations. Mass loss rates (or upper limits) were derived for all the observed stars and the results compared with non-radio measurements and theoretical predictions.
format Articulo
Articulo
author Benaglia, Paula
Cappa, Cristina Elisabet
Koribalski, B. S.
author_facet Benaglia, Paula
Cappa, Cristina Elisabet
Koribalski, B. S.
author_sort Benaglia, Paula
title Mass loss rate determinations of southern OB stars
title_short Mass loss rate determinations of southern OB stars
title_full Mass loss rate determinations of southern OB stars
title_fullStr Mass loss rate determinations of southern OB stars
title_full_unstemmed Mass loss rate determinations of southern OB stars
title_sort mass loss rate determinations of southern ob stars
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/123953
work_keys_str_mv AT benagliapaula masslossratedeterminationsofsouthernobstars
AT cappacristinaelisabet masslossratedeterminationsofsouthernobstars
AT koribalskibs masslossratedeterminationsofsouthernobstars
bdutipo_str Repositorios
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