2013A&A...551A.110M


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.19CET17:16:42

2013A&A...551A.110M - Astronomy and Astrophysics, volume 551A, 110-110 (2013/3-1)

Deep optical imaging of asymptotic giant branch circumstellar envelopes.

MAURON N., HUGGINS P.J. and CHEUNG C.-L.

Abstract (from CDS):

We report results of a program to image the extended circumstellar envelopes of asymptotic giant branch (AGB) stars in dust-scattered Galactic light. The goal is to characterize the shapes of the envelopes to probe the mass-loss geometry and the presence of hidden binary companions. The observations consist of deep optical imaging of 22 AGB stars with high mass loss rates: 16 with the ESO 3.6 m NTT telescope, and the remainder with other telescopes. The circumstellar envelopes are detected in 15 objects, with mass loss rates >2x10–6M/yr. The surface brightness of the envelopes shows a strong decrease with Galactic radius, which indicates a steep radial gradient in the interstellar radiation field. The envelopes range from circular to elliptical in shape, and we characterize them by the ellipticity (E = major/minor axis) of iso-intensity contours. We find that ∼50% of the envelopes are close to circular with E≲1.1, and others are more elliptical with ∼20% with E>1.2. We interpret the shapes in terms of populations of single stars and binaries whose envelopes are flattened by a companion. The distribution of E is qualitatively consistent with expectations based on population synthesis models of binary AGB stars. We also find that ∼50% of the sample exhibit small-scale, elongated features in the central regions. We interpret these as the escape of light from the central star through polar holes, which are also likely produced by companions. Our observations of envelope flattening and polar holes point to a hidden population of binary companions within the circumstellar envelopes of AGB stars. These companions are expected to play an important role in the transition to post-AGB stars and the formation of planetary nebulae.

Abstract Copyright:

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

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* BE Phe Mi? 00 21 47.4180506941 -40 17 15.472495948         11.51 M9+ 31 0
2 V* T Phe Mi* 00 30 26.2344686608 -46 24 33.373015476   12.46 11.43 12.43   M7e 63 0
3 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 405 0
4 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1452 0
5 NSV 16214 OH* 05 00 24.6068229583 +12 56 06.533965002           ~ 30 0
6 IRAS 05418-3224 C* 05 43 43.0567966055 -32 23 28.728452019   20.9 13.14 14.3   C-rich 22 0
7 RAFGL 865 C* 06 04 00.04728 +07 25 52.0104           C-rich 97 0
8 IRAS 06255-4928 * 06 26 48.4741921384 -49 30 46.815702032           ~ 10 0
9 UCAC2 31649149 * 06 51 59.0170611184 -00 21 31.694441110 16.179 15.861 15.290 14.988 14.593 ~ 10 0
10 RAFGL 4078 C* 07 45 02.4140089106 -71 19 45.852846228       15.92 12.72 C 47 0
11 RAFGL 5254 C* 09 13 53.9380628049 -24 51 25.223261483           C-rich 49 0
12 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2172 0
13 RAFGL 4098 C* 09 52 29.9278449943 -75 22 27.908965365       15.38 13.65 C-rich 23 0
14 IRAS 10323-4611 C*? 10 34 30.9747511248 -46 27 28.938978663     13.92     ~ 18 0
15 IRAS 12384-4536 OH* 12 41 15.6580868800 -45 53 25.433414790           ~ 16 0
16 IRAS 14591-4438 OH* 15 02 32.1901969736 -44 50 07.870690331           ~ 20 1
17 RAFGL 1822 OH* 16 06 08.363 -30 49 33.99           ~ 51 0
18 IRAS 17319-6234 OH* 17 36 37.757 -62 35 55.20           ~ 23 1
19 RAFGL 2155 C* 18 26 05.83560 +23 28 46.6932         17.63 C-rich 79 0
20 IRAS 18467-4802 OH* 18 50 29.584 -47 59 10.11         18.23 ~ 26 0
21 RAFGL 2370 OH* 19 20 55.7610413925 -26 14 35.515965607         15.94 M7III 31 0
22 V* V2234 Sgr Mi* 20 07 41.6881282040 -42 32 20.280815160       11.28   M9e 31 0
23 IRC -10529 OH* 20 10 27.8733409252 -06 16 13.757843352         15.49 M: 134 0
24 RAFGL 3068 C* 23 19 12.60744 +17 11 33.1332           C 256 0
25 RAFGL 3099 C* 23 28 17.1148783705 +10 54 37.400631176           C-rich 88 0
26 IRC +40540 C* 23 34 27.5215563443 +43 33 01.299562617     15.12     C8,3.5eJ 171 0

    Equat.    Gal    SGal    Ecl

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2021.01.19-17:16:42

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