2016MNRAS.463..763M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET17:33:44

2016MNRAS.463..763M - Mon. Not. R. Astron. Soc., 463, 763-770 (2016/November-3)

e-MERLIN 21 cm constraints on the mass-loss rates of OB stars in Cyg OB2.

MORFORD J.C., FENECH D.M., PRINJA R.K., BLOMME R. and YATES J.A.

Abstract (from CDS):

We present e-MERLIN 21 cm (L-band) observations of single luminous OB stars in the Cygnus OB2 association, from the Cyg OB2 Radio Survey Legacy programme. The radio observations potentially offer the most straightforward, least model-dependent, determinations of mass-loss rates, and can be used to help resolve current discrepancies in mass-loss rates via clumped and structured hot star winds. We report here that the 21 cm flux densities of O3 to O6 supergiant and giant stars are less than ∼70 µJy. These fluxes may be translated to 'smooth' wind mass-loss upper limits of ∼4.4-4.8 x 10–6 M yr –1 for O3 supergiants and <=2.9 x 10–6 M yr –1 for B0 to B1 supergiants. The first ever resolved 21 cm detections of the hypergiant (and luminous blue variable candidate) Cyg OB2 #12 are discussed; for multiple observations separated by 14 d, we detect an ∼69 per cent increase in its flux density. Our constraints on the upper limits for the mass-loss rates of evolved OB stars in Cyg OB2 support the model that the inner wind region close to the stellar surface (where Hα forms) is more clumped than the very extended geometric region sampled by our radio observations.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: early type - stars: mass-loss - galaxies: clusters: individual: (Cygnus OB2) - radio continuum: stars - radio continuum: stars

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2255 0
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3843 2
3 QSO B2005+40 QSO 20 07 44.9443187008 +40 29 48.601470737   18.5 19 20.3   ~ 275 1
4 NAME Northern Coalsack DNe 20 21 +37.0           ~ 106 0
5 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 645 1
6 IRC +40427 s*r 20 31 28.6960079604 +40 38 43.413799407     11.4     M0/2I 25 0
7 IRAS 20298+4011 Em* 20 31 42.2841507943 +40 21 59.061205285     15.1     B:I[e] 87 0
8 TeV J2032+4130 gam 20 32.1 +41 34           ~ 123 0
9 EM* AS 422 WR* 20 32 06.2783569769 +40 48 29.521225515   13.46 11.83     WN7o/CE+O7V(f) 96 0
10 BD+40 4220 EB* 20 32 22.4241357648 +41 18 18.942382590 11.32 10.79 9.185     O6.5-7f+O5.5-6f 373 0
11 18P 59 HII 20 32 31.2 +40 16 35           ~ 64 0
12 RLP 887 SB* 20 32 31.5335925286 +41 14 08.189588225   15.44 13.00 12.15   ~ 16 0
13 BD+40 4223 * 20 32 39.0565123181 +41 00 07.765871027 13.02 12.0 10.5     B0Ia 17 0
14 Schulte 12 s*b 20 32 40.9574572449 +41 14 29.276333992 16.1 14.45 11.702     B3-4Ia+ 368 0
15 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 720 0
16 Schulte 22 ** 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 65 0
17 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 819 0
18 Schulte 7 * 20 33 14.1095790591 +41 20 21.903381641 12.24 12.00 10.55     O3If* 132 0
19 BD+40 4227B * 20 33 14.7562172226 +41 18 41.748124821 11.99 11.64 10.70     O6II(f) 75 0
20 Schulte 8C * 20 33 17.9821559015 +41 18 31.192311433 12.2 11.43 10.19     O4.5III(fc) 76 0
21 Schulte 18 * 20 33 30.7902492275 +41 15 22.690816786 13.38 12.54 10.860     B1I 46 0
22 GSC 03161-01254 * 20 33 33.939 +41 19 38.25 15.95 15.49 13.87     B3I 17 0
23 Schulte 19 s*b 20 33 39.1043036607 +41 19 25.991882191 12.91 12.77 10.944 10.38   B0Iab 66 0
24 18P 64 Rad 20 35 08.4 +41 13 20           ~ 21 0
25 MR 112 WR* 20 35 47.0859278605 +41 22 44.703520146     12.64 12.16   WC5-6e+O8 145 1

    Equat.    Gal    SGal    Ecl

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