2015A&A...578A.108V


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST01:49:57

2015A&A...578A.108V - Astronomy and Astrophysics, volume 578A, 108-108 (2015/6-1)

The Herschel view of the nebula around the luminous blue variable star AG Carinae.

VAMVATIRA-NAKOU C., HUTSEMEKERS D., ROYER P., COX N.L.J., NAZE Y., RAUW G., WAELKENS C. and GROENEWEGEN M.A.T.

Abstract (from CDS):

Far-infrared Herschel PACS imaging and spectroscopic observations of the nebula around the luminous blue variable (LBV) star AG Car have been obtained along with optical imaging in the Hα+[NII] filter. In the infrared light, the nebula appears as a clumpy ring shell that extends up to 1.2pc with an inner radius of 0.4pc. It coincides with the Hα nebula, but extends further out. Dust modeling of the nebula was performed and indicates the presence of large grains. The dust mass is estimated to be ∼0.2M. The infrared spectrum of the nebula consists of forbidden emission lines over a dust continuum. Apart from ionized gas, these lines also indicate the existence of neutral gas in a photodissociation region that surrounds the ionized region. The abundance ratios point towards enrichment by processed material. The total mass of the nebula ejected from the central star amounts to ∼15M, assuming a dust-to-gas ratio typical of LBVs. The abundances and the mass-loss rate were used to constrain the evolutionary path of the central star and the epoch at which the nebula was ejected, with the help of available evolutionary models. This suggests an ejection during a cool LBV phase for a star of ∼55M with little rotation.

Abstract Copyright:

Journal keyword(s): circumstellar matter - stars: massive - stars: mass-loss - stars: variables: S Doradus - stars: individual: AG Carinae

Simbad objects: 10

goto Full paper

goto View the reference in ADS

Number of rows : 10

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 269006 s*b 05 02 07.3944119328 -71 20 13.118657760 9.93 10.60 10.55 10.43 10.38 LBV 232 0
2 HD 269858 s*b 05 36 43.6942807271 -69 29 47.449383685   10.24 10.15 9.95 9.05 LBV 266 2
3 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 303 0
4 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 893 2
5 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2208 0
6 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 592 0
7 MR 35 s*b 11 08 40.0633818066 -60 42 51.718989987   12.33 10.20 11.66   LBV 115 0
8 WRAY 15-1676 pA* 17 19 49.3292317040 -39 10 37.929612963     13.1     ~ 41 1
9 HD 168625 s*b 18 21 19.5486475779 -16 22 26.077308888 10.15 9.78 8.37 8.76   B6Iap 250 2
10 IRAS 20298+4011 Em* 20 31 42.2841507943 +40 21 59.061205285     15.1     B:I[e] 85 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2015A&A...578A.108V and select 'bookmark this link' or equivalent in the popup menu


2020.08.04-01:49:57

© Université de Strasbourg/CNRS

    • Contact