Multiwavelength studies of WR 21a and its surroundings

We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA**) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0....

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Detalles Bibliográficos
Autores principales:	Benaglia, Paula, Romero, Gustavo Esteban, Koribalski, B., Pollock, A. M.T.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2005
Materias:	Ciencias Astronómicas Gamma-rays: observations ISM: bubbles Radio continuum: stars Stars: early-type Stars: individual: WR 21a Stars: winds, outflows
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/83278
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-83278
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 Gamma-rays: observations ISM: bubbles Radio continuum: stars Stars: early-type Stars: individual: WR 21a Stars: winds, outflows
spellingShingle	Ciencias Astronómicas Gamma-rays: observations ISM: bubbles Radio continuum: stars Stars: early-type Stars: individual: WR 21a Stars: winds, outflows Benaglia, Paula Romero, Gustavo Esteban Koribalski, B. Pollock, A. M.T. Multiwavelength studies of WR 21a and its surroundings
topic_facet	Ciencias Astronómicas Gamma-rays: observations ISM: bubbles Radio continuum: stars Stars: early-type Stars: individual: WR 21a Stars: winds, outflows
description	We present results of high-resolution radio continuum observations towards the binary star WR 21a (Wack 2134) obtained with the Australia Telescope Compact Array (ATCA**) at 4.8 and 8.64 GHz. We detected the system at 4.8 GHz (6 cm) with a flux density of 0.25 ± 0.06 mJy and set an upper limit of 0.3 mJy at 8.64 GHz (3 cm). The derived spectral index of α < 0.3 (S v ∝ v α ) suggests the presence of non-thermal emission, probably originating in a colliding-wind region. A second, unrelated radio source was detected ∼10″ north of WR 21a at (RA, Dec) J2000 = (10 h 25 m 56 s .49, -57°48′34.4″), with flux densities of 0.36 and 0.55 mJy at 4.8 and 8.64 GHz, respectively, resulting in α = 0.72. H I observations in the area are dominated by absorption against the prominent H II region RCW 49. Analysis of a complete set of archived X-ray observations of WR 21a confirms its strong variability but throws into doubt previous suggestions by Reig (1999) of a period of years for the system. Finally, we comment on the association with the nearby EGRET source 3EG J1027-5817.
format	Articulo Articulo
author	Benaglia, Paula Romero, Gustavo Esteban Koribalski, B. Pollock, A. M.T.
author_facet	Benaglia, Paula Romero, Gustavo Esteban Koribalski, B. Pollock, A. M.T.
author_sort	Benaglia, Paula
title	Multiwavelength studies of WR 21a and its surroundings
title_short	Multiwavelength studies of WR 21a and its surroundings
title_full	Multiwavelength studies of WR 21a and its surroundings
title_fullStr	Multiwavelength studies of WR 21a and its surroundings
title_full_unstemmed	Multiwavelength studies of WR 21a and its surroundings
title_sort	multiwavelength studies of wr 21a and its surroundings
publishDate	2005
url	http://sedici.unlp.edu.ar/handle/10915/83278
work_keys_str_mv	AT benagliapaula multiwavelengthstudiesofwr21aanditssurroundings AT romerogustavoesteban multiwavelengthstudiesofwr21aanditssurroundings AT koribalskib multiwavelengthstudiesofwr21aanditssurroundings AT pollockamt multiwavelengthstudiesofwr21aanditssurroundings
bdutipo_str	Repositorios
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Multiwavelength studies of WR 21a and its surroundings

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