2006A&A...452..257M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST11:10:26

2006A&A...452..257M - Astronomy and Astrophysics, volume 452, 257-268 (2006/6-2)

Imaging the circumstellar envelopes of AGB stars.

MAURON N. and HUGGINS P.J.

Abstract (from CDS):

We report the results of an exploratory program to image the extended circumstellar envelopes of asymptotic giant branch (AGB) stars in dust-scattered galactic light. The goal is to characterize the morphology of the envelopes as a probe of the mass-loss process. The observations consist of short exposures with the VLT and longer exposures with 1-2m telescopes, augmented with archival images from the Hubble Space Telescope. We observed 12 AGB stars and detected the circumstellar envelopes in 7. The detected envelopes have mass loss rates >5x10–6M/yr, and they can be seen out to distances >1kpc. The observations provide information on the mass loss history on time scales up to ∼10000yr. For the five AGB envelopes in which the circumstellar geometry is well determined by scattered light observations, all except one (OH348.2-19.7) show deviations from spherical symmetry. Two (IRC+10216 and IRC+10011) show roughly spherical envelopes at large radii but asymmetry or bipolarity close to the star; one (AFGL 2514) shows an extended, elliptical envelope, and one (AFGL 3068) shows a spiral pattern. The non-spherical structures are all consistent with the effects of binary interactions. Our observations are in accord with a scenario in which binary companions play a role in shaping planetary nebulae, and show that the circumstellar gas is already partly shaped on the AGB, before evolution to the proto-planetary nebula phase.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: mass-loss - stars: circumstellar matter - stars: late-type

Simbad objects: 13

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Number of rows : 13

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 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 396 0
2 IRAS 02152+2822 C* 02 18 06.0449013192 +28 36 45.346478742           C-rich 49 0
3 V* IK Tau Mi* 03 53 28.8884898148 +11 24 21.865959095 16.99 17.03 13.39 7.29 3.20 M7-11 570 0
4 IRC +70066 Mi* 05 46 44.3250774318 +69 58 24.408023024           M9.5 73 0
5 RAFGL 5254 C* 09 13 53.9380628049 -24 51 25.223261483           C-rich 49 0
6 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2134 0
7 V* RW LMi C* 10 16 02.2834693816 +30 34 18.977096332       15.27   C4,3e 379 0
8 RAFGL 2155 C* 18 26 05.83560 +23 28 46.6932         17.63 C-rich 78 0
9 IRAS 18467-4802 OH* 18 50 29.584 -47 59 10.11         18.23 ~ 26 0
10 IRC -10529 OH* 20 10 27.8733409252 -06 16 13.757843352         15.49 M: 130 0
11 RAFGL 3068 C* 23 19 12.60744 +17 11 33.1332           C 249 0
12 RAFGL 3099 C* 23 28 17.1148783705 +10 54 37.400631176           C-rich 87 0
13 IRC +40540 C* 23 34 27.5215563443 +43 33 01.299562617     15.12     C8,3.5eJ 170 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-11:10:26

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