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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2004
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84417 |
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I19-R120-10915-84417 |
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institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
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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 |
work_keys_str_mv |
AT benagliapaula radioobservationsofhd93129atheearliestostarwiththehighestmassloss AT koribalskib radioobservationsofhd93129atheearliestostarwiththehighestmassloss |
bdutipo_str |
Repositorios |
_version_ |
1764820488703442944 |