2005A&A...440..743B


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.19CET12:14:13

2005A&A...440..743B - Astronomy and Astrophysics, volume 440, 743-750 (2005/9-3)

Multiwavelength studies of WR 21a and its surroundings.

BENAGLIA P., ROMERO G.E., KORIBALSKI B. and POLLOCK A.M.T.

Abstract (from CDS):

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 8.64GHz. We detected the system at 4.8GHz (6cm) with a flux density of 0.25±0.06mJy and set an upper limit of 0.3mJy at 8.64GHz (3cm). The derived spectral index of α<0.3 (Sν∝να) 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=(10h25m56.49s, -57°48'34.4"), with flux densities of 0.36 and 0.55mJy at 4.8 and 8.64GHz, respectively, resulting in α=0.72. HI observations in the area are dominated by absorption against the prominent HII 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.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: individual: WR 21a - stars: winds, outflows - radio continuum: stars - ISM: bubbles - gamma-rays: observations

CDS comments: Paragraph 3.1 phase calibrator 1039-47 = IERS B1039-474. Paragraph 4.1 source S2 = EQ J102556-574834 in SIMBAD.

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 4004 WR* 00 43 28.3971235391 +64 45 35.383738645 10.28 10.718 10.138     WN4-s 176 0
2 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 732 0
3 NAME Car Arm PoG 10 00 -60.0           ~ 369 1
4 SNR G284.3-01.8 Rad 10 18.3 -59 00           ~ 100 2
5 V* V712 Car bL* 10 23 58.002 -57 45 48.99 15.452 15.461 13.5 12.6   O3If*/WN6+O3If*/WN6 146 1
6 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 266 0
7 2E 1022.1-5730 X 10 24 01.6 -57 45 21           ~ 4 1
8 GUM 29 HII 10 24 14.6 -57 46 58           ~ 190 0
9 WR 20b WR* 10 24 18.3972653285 -57 48 29.778301585     13.7 12.0   WN6ha 46 0
10 EQ J102556-574834 Rad 10 25 56.49 -57 48 34.4           ~ 1 0
11 WR 21a WR* 10 25 56.5023591737 -57 48 43.517827393     12.67     O2If*/WN5 80 0
12 ICRF J104142.9-474006 QSO 10 41 42.93640 -47 40 06.4954   18.25       ~ 28 1
13 HD 165688 WR* 18 07 56.9612003141 -19 23 56.866361615 10.46 10.31 9.87 9.85   WN5-6b 141 0
14 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 929 1
15 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 642 1
16 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC5-6e+O8 138 1
17 EM* AS 431 WR* 20 36 43.6 +40 21 08   17.04 14.89     WN8(h)+B0.5V 202 2

    Equat.    Gal    SGal    Ecl

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2020.01.19-12:14:13

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