Radio observations of HD 93129A: The earliest O star with the highest mass loss?

We present the results of radio continuum observations towards the open cluster Tr 14, where our main targets are the early-type O stars HD 93129A/B and HD 93128. The observations were carried out at 3 cm (8.64 GHz) and 6 cm (4.80 GHz) with the Australia Telescope Compact Array. Only HD 93129A (type...

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Detalles Bibliográficos
Autores principales: Benaglia, Paula, Koribalski, B.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Astronómicas
Radio continuum: stars
Stars: individual: HD 93129A, HD 93129B, HD 93128
Stars: mass-loss
Stars: winds, outflows
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84417
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84417
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
Radio continuum: stars
Stars: individual: HD 93129A, HD 93129B, HD 93128
Stars: mass-loss
Stars: winds, outflows
spellingShingle Ciencias Astronómicas
Radio continuum: stars
Stars: individual: HD 93129A, HD 93129B, HD 93128
Stars: mass-loss
Stars: winds, outflows
Benaglia, Paula
Koribalski, B.
Radio observations of HD 93129A: The earliest O star with the highest mass loss?
topic_facet Ciencias Astronómicas
Radio continuum: stars
Stars: individual: HD 93129A, HD 93129B, HD 93128
Stars: mass-loss
Stars: winds, outflows
description We present the results of radio continuum observations towards the open cluster Tr 14, where our main targets are the early-type O stars HD 93129A/B and HD 93128. The observations were carried out at 3 cm (8.64 GHz) and 6 cm (4.80 GHz) with the Australia Telescope Compact Array. Only HD 93129A (type O2 If*) was detected; we measure flux densities of S<SUB>3cm</SUB> = 2.0 ± 0.2 mJy and S<SUB>6cm</SUB> = 4.1 ± 0.4 mJy. The resulting spectral index of α = -1.2 ± 0.3 (S<SUB>v</SUB> ∝ v<SUP>α</SUP>) indicates predominantly non-thermal emission, suggesting HD 93129A may be a binary system. We propose that the observed 3 cm radio emission is mostly coming from the non-thermal wind collision region of a binary, and, to a lesser extent, from the thermal winds of the primary and secondary stars in HD 93129A. At a stellar distance of 2.8 kpc, we derive a mass-loss rate M = 5.1 × 10<SUP>-5</SUP> M⊙ yr<SUP>-1</SUP>, assuming the thermal fraction of the 3 cm emission is ∼0.5.
format Articulo
Articulo
author Benaglia, Paula
Koribalski, B.
author_facet Benaglia, Paula
Koribalski, B.
author_sort Benaglia, Paula
title Radio observations of HD 93129A: The earliest O star with the highest mass loss?
title_short Radio observations of HD 93129A: The earliest O star with the highest mass loss?
title_full Radio observations of HD 93129A: The earliest O star with the highest mass loss?
title_fullStr Radio observations of HD 93129A: The earliest O star with the highest mass loss?
title_full_unstemmed Radio observations of HD 93129A: The earliest O star with the highest mass loss?
title_sort radio observations of hd 93129a: the earliest o star with the highest mass loss?
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/84417
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AT koribalskib radioobservationsofhd93129atheearliestostarwiththehighestmassloss
bdutipo_str Repositorios
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