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....
| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2005
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83278 |
| Aporte de: |
| id |
I19-R120-10915-83278 |
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| 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 |
| _version_ |
1764820488459124739 |