2010MNRAS.401L..48G

Query : 2010MNRAS.401L..48G

2010MNRAS.401L..48G - Mon. Not. R. Astron. Soc., 401, L48-L52 (2010/January-1)

Submillimetre variability of eta Carinae: cool dust within the outer ejecta.

GOMEZ H.L., VLAHAKIS C., STRETCH C.M., DUNNE L., EALES S.A., BEELEN A., GOMEZ E.L. and EDMUNDS M.G.

Abstract (from CDS):

Previous submillimetre (submm) observations detected 0.7M☉of cool dust emission around the luminous blue variable (LBV) star η Carinae. These observations were hindered by the low declination of η Carinae and contamination from free-free emission originating from the stellar wind. Here, we present deep submm observations with LABOCA at 870µm, taken shortly after a maximum in the 5.5-year radio cycle. We find a significant difference in the submm flux measured here compared with the previous measurement: the first indication of variability at submm wavelengths. A comparison of the submm structures with ionized emission features suggests the 870µm is dominated by emission from the ionized wind and not thermal emission from dust. We estimate of dust surrounding η Carinae. The spatial distribution of the submm emission limits the mass loss to within the last thousand years, and is associated with mass ejected during the great eruptions and the pre-outburst LBV wind phase; we estimate that η Carinae has ejected >40M☉of gas within this time-scale.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): stars: individual: η Carinae - stars: mass loss - submillimetre

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Car Arm PoG 10 00 -60.0           ~ 471 1
2 NAME Carina I HII Region HII 10 43 32 -59 35.0           ~ 59 0
3 [W94d] Car II-W Rad 10 44 38.6 -59 39 41           ~ 4 0
4 [W94d] Car II-N Rad 10 44 38.7 -59 37 31           ~ 4 0
5 NAME Car II HII Region HII 10 44 47 -59 38.8           ~ 40 0
6 NAME Little Homunculus ISM 10 45 -59.7           ~ 71 2
7 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
8 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 379 1
9 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
10 [W94d] Car II-E mm 10 45 03.9 -59 38 22           ~ 4 0
11 Triton 14 * 19 18 23.2159700832 -21 27 39.975006528           ~ 4 0

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