2008A&A...488..203Q


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST11:16:54

2008A&A...488..203Q - Astronomy and Astrophysics, volume 488, 203-210 (2008/9-2)

The structure and chemistry of the massive shell around AFGL2343: 29SiO and HCN as tracers of high-excitation regions.

QUINTANA-LACACI G., BUJARRABAL V. and CASTRO-CARRIZO A.

Abstract (from CDS):

The yellow hypergiant stars (YHGs) are very massive objects that are expected to pass through periods of intense mass loss during their evolution. Despite this, massive circumstellar envelopes have been found in only two of them, IRC+10420 and AFGL2343. The envelopes around these objects and the processes that form them are poorly known. We aim to study the structure, dynamics, and chemistry of the envelope around AFGL2343. We obtained interferometric maps of the rotational lines 29SiO J=2-1, HCN J=1-0 and SO JK=22-11 towards AFGL2343. We used an LVG excitation model to analyze the new observations and some previously published line profiles of AFGL2343. The analysis of the observational data and the fitting results show the presence of a thin, hot, and dense component within the previously identified CO shell. This component can be associated with recently shocked gas, but it could also be caused by a phase of extremely copious mass loss. We suggest that this shell is responsible for the whole 29SiO emission and that it significantly contributes to the HCN emission. The presence of such a dense shell rich in SiO can be related with the one previously found for IRC+10420, which was also suggested to result from a shock. This may be a common feature in the evolution of these stars, as a consequence of the episodic mass loss periods they go through during their evolution. We present new results for the mass loss pattern, the total mass of the circumstellar envelope, and the molecular abundances of some species in AFGL2343.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: supergiants - stars: AGB and post-AGB - radio lines: stars - stars: individual: AFGL2343

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5241 1
2 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 780 1
3 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 216 0
4 ICRF J192559.6+210626 QSO 19 25 59.60535560 +21 06 26.1620442           ~ 172 1
5 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 448 0
6 QSO B2022-077 BLL 20 25 40.6599681095 -07 35 52.689195990   18.5       ~ 159 3
7 EM* MWC 349 Em* 20 32 45.6328 +40 39 36.143   15.88 13.15 12.13   Bep 688 1
8 * rho Cas LP* 23 54 23.0339951270 +57 29 57.766930774 7.00 5.85 4.59 3.63 2.89 G2_0 357 0

    Equat.    Gal    SGal    Ecl

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2019.10.14-11:16:54

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