2018MNRAS.477L..55A

Query : 2018MNRAS.477L..55A

2018MNRAS.477L..55A - Mon. Not. R. Astron. Soc., 477, L55-L59 (2018/June-2)

Asymmetric ejecta of cool supergiants and hypergiants in the massive cluster Westerlund 1.

ANDREWS H., FENECH D., PRINJA R.K., CLARK J.S. and HINDSON L.

Abstract (from CDS):

We report new 5.5 GHz radio observations of the massive star cluster Westerlund 1, taken by the Australia Telescope Compact Array, detecting nine of the ten yellow hypergiants (YHGs) and red supergiants (RSGs) within the cluster. Eight of nine sources are spatially resolved. The nebulae associated with the YHGs Wd1-4a, -12a, and -265 demonstrate a cometary morphology - the first time this phenomenon has been observed for such stars. This structure is also echoed in the ejecta of the RSGs Wd1-20 and -26; in each case the cometary tails are directed away from the cluster core. The nebular emission around the RSG Wd1-237 is less collimated than these systems but once again appears more prominent in the hemisphere facing the cluster. Considered as a whole, the nebular morphologies provide compelling evidence for sculpting via a physical agent associated with Westerlund 1, such as a cluster wind.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: evolution - stars: massive - supergiants - stars: winds, outflows

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1671 0
2 ICRF J082526.8-501038 QSO 08 25 26.8673494560 -50 10 38.484054768   20.94       ~ 133 1
3 PMN J1603-4904 BLL 16 03 50.68456556 -49 04 05.5056817   20.67       ~ 81 0
4 PMN J1636-4101 Rad 16 36 55.37549626 -41 02 00.5090706           ~ 21 1
5 Cl* Westerlund 1 BKS H s*y 16 47 01.4269856784 -45 50 37.248841536   18.781 14.47 11.80 9.15 F3Ia+ 29 0
6 Cl* Westerlund 1 W 12 s*y 16 47 02.2214295629 -45 50 58.987616665   22.0 17.575 13.611 10.42 A5Ia+ 27 0
7 Cl Westerlund 1 Cl* 16 47 02.4 -45 51 07           ~ 569 0
8 Cl* Westerlund 1 W 237 s*r 16 47 03.1097130192 -45 52 18.960733164   22.8 19.008 13.634 9.19 M3I 29 0
9 Cl* Westerlund 1 BKS F s*y 16 47 03.6850109472 -45 50 43.536110712     15.05     F5Ia+ 23 0
10 Cl* Westerlund 1 W 20 s*r 16 47 04.6967287296 -45 51 23.953706496       15.660   M6I 24 0
11 Cl* Westerlund 1 W 8 s*y 16 47 04.7959778348 -45 50 25.013789709   19.9 15.913 12.64 9.89 F8Ia+ 22 0
12 2MASS J16470540-4550367 s*r 16 47 05.4076906176 -45 50 36.617071668   22.1 16.79 12.63 9.19 M2-5Ia 36 0
13 Cl* Westerlund 1 W 265 s*y 16 47 06.2785465416 -45 49 23.774098692   22.0 17.739 13.62 10.54 F1-5Ia+ 26 0
14 Cl* Westerlund 1 W 16 sg* 16 47 06.6158603112 -45 50 42.186706944   20.5 16.248 12.82 9.90 A5Ia+ 29 0
15 2MASS J16470892-4549585 s*r 16 47 08.9198319768 -45 49 58.452357324     16.70     M4Ia 26 0
16 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 369 0
17 IRC -10414 s*r 18 23 17.9055962736 -13 42 47.118241332       11.149   M7I 86 0
18 IRC +10420 pA* 19 26 48.0979492536 +11 21 16.758531216   13.98 11.66     F8Ia+e 477 0
19 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1230 1
20 * mu. Cep s*r 21 43 30.4595558543 +58 46 48.165937434 8.85 6.43 4.08 1.98 0.22 M2-Ia 669 1

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