2017ApJ...841..130A


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET09:02:04

2017ApJ...841..130A - Astrophys. J., 841, 130-130 (2017/June-1)

The luminous blue variable RMC 127 as seen with ALMA and ATCA.

AGLIOZZO C., TRIGILIO C., PIGNATA G., PHILLIPS N.M., NIKUTTA R., LETO P., UMANA G., INGALLINERA A., BUEMI C., BAUER F.E., PALADINI R., NORIEGA-CRESPO A., PRIETO J.L., MASSARDI M. and CERRIGONE L.

Abstract (from CDS):

We present ALMA and ATCA observations of the luminous blue variable RMC 127. The radio maps show for the first time the core of the nebula and evidence that the nebula is strongly asymmetric with a Z-pattern shape. Hints of this morphology are also visible in the archival Hubble Space Telescope Hαimage, which overall resembles the radio emission. The emission mechanism in the outer nebula is optically thin free-free in the radio. At high frequencies, a component of point-source emission appears at the position of the star, up to the ALMA frequencies. The rising flux density distribution (Sν∼ν^0.78±0.05^) of this object suggests thermal emission from the ionized stellar wind and indicates a departure from spherical symmetry with ne(r)∝r–2. We examine different scenarios to explain this excess of thermal emission from the wind and show that this can arise from a bipolar outflow, supporting the suggestion by other authors that the stellar wind of RMC 127 is aspherical. We fit the data with two collimated ionized wind models, and we find that the mass-loss rate can be a factor of two or more smaller than in the spherical case. We also fit the photometry obtained by IR space telescopes and deduce that the mid- to far-IR emission must arise from extended, cool (∼80 K) dust within the outer ionized nebula. Finally, we discuss two possible scenarios for the nebular morphology: the canonical single-star expanding shell geometry and a precessing jet model assuming the presence of a companion star.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: individual: RMC 127 - stars: massive - stars: mass-loss - stars: rotation - stars: winds, outflows - submillimeter: stars - submillimeter: stars

Simbad objects: 22

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Number of rows : 22

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10585 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9111 1
3 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 355 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5027 1
5 NAME Pictor A Sy1 05 19 49.7230919028 -45 46 43.855209977   15.73 15.77 14.85   ~ 534 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14349 1
7 ICRF J052930.0-724528 QSO 05 29 30.04217690 -72 45 28.5072742   19.61   17.895   ~ 75 1
8 HD 269858 s*b 05 36 43.6942807271 -69 29 47.449383685   10.24 10.15 9.95 9.05 LBV 261 2
9 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 765 2
10 CPD-69 463 s*y 05 38 51.6167474749 -69 08 07.314653596 11.93 12.45 12.014     F7Ia 77 1
11 LHA 120-S 61 WR* 05 45 51.9393679113 -67 14 25.939050679 10.870 11.86 11.95 12.09 11.931 WN11h 74 0
12 EM* MWC 137 Ae* 06 18 45.5220562759 +15 16 52.242746933 12.89 13.30 13.759 11.67 10.31 sgB[e]d 221 1
13 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 496 1
14 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 300 0
15 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2154 0
16 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 580 0
17 WR 102c WR* 17 46 11.14 -28 49 05.9           WN6 22 1
18 MSX6C G026.4700+00.0207 s*b 18 39 32.2479397055 -05 44 20.194778342           LBV_B 34 1
19 IRAS 18576+0341 s*b 19 00 10.89456 +03 45 47.1096           B8I 80 1
20 QSO B1921-293 BLL 19 24 51.05595514 -29 14 30.1210524   18.71 18.21 15.07   ~ 654 0
21 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 922 1
22 IRAS 20298+4011 Em* 20 31 42.2841507943 +40 21 59.061205285     15.1     B:I[e] 83 0

    Equat.    Gal    SGal    Ecl

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2019.11.20-09:02:04

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