2018A&A...617A.132D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:50:03

2018A&A...617A.132D - Astronomy and Astrophysics, volume 617A, 132-132 (2018/9-1)

Sulphur-bearing molecules in AGB stars. II. Abundances and distributions of CS and SiS.

DANILOVICH T., RAMSTEDT S., GOBRECHT D., DECIN L., DE BECK E. and OLOFSSON H.

Abstract (from CDS):


Context. Sulphur has long been known to form different molecules depending on the chemical composition of its environment. More recently, the sulphur-bearing molecules SO and H2S have been shown to behave differently in oxygen-rich asymptotic giant branch (AGB) circumstellar envelopes of different densities.
Aims. By surveying a diverse sample of AGB stars for CS and SiS emission, we aim to determine in which environments these sulphur-bearing molecules most readily occur. We include sources with a range of mass-loss rates and carbon-rich, oxygen-rich, and mixed S-type chemistries. Where these molecules are detected, we aim to determine their CS and SiS abundances.
Methods. We surveyed 20 AGB stars of different chemical types using the APEX telescope, and combined this with an IRAM 30 m and APEX survey of CS and SiS emission towards over 30 S-type stars. For those stars with detections, we performed radiative transfer modelling to determine abundances and abundance distributions.
Results. We detect CS towards all the surveyed carbon stars, some S-type stars, and the highest mass-loss rate oxygen-rich stars, (M≥5x10–6M/yr). SiS is detected towards the highest mass-loss rate sources of all chemical types (M≥8x10–7M/yr). We find CS peak fractional abundances ranging from ∼4x10–7 to ∼2x10–5 for the carbon stars, from ∼3x10–8 to ∼1x10–7 for the oxygen-rich stars, and from ∼1x10–7 to ∼8x10–6 for the S-type stars. We find SiS peak fractional abundances ranging from ∼9x10–6 to ∼2x10–5 for the carbon stars, from ∼5x10–7 to ∼2x10–6 for the oxygen-rich stars, and from ∼2x10–7 to ∼2x10–6 for the S-type stars.
Conclusions. Overall, we find that wind density plays an important role in determining the chemical composition of AGB circumstellar envelopes. It is seen that for oxygen-rich AGB stars both CS and SiS are detected only in the highest density circumstellar envelopes and their abundances are generally lower than for carbon-rich AGB stars by around an order of magnitude. For carbon-rich and S-type stars SiS was also only detected in the highest density circumstellar envelopes, while CS was detected consistently in all surveyed carbon stars and sporadically among the S-type stars.

Abstract Copyright: © ESO 2018

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

VizieR on-line data: <Available at CDS (J/A+A/617/A132): list.dat fits/*>

Simbad objects: 60

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Number of rows : 60

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 V* T Cet S* 00 21 46.2731778 -20 03 28.884826   7.32 5.74     M5-6Se 139 0
2 V* R And S* 00 24 01.9473999328 +38 34 37.326131071 10.61 9.36 7.39 4.45 2.30 S5-7/4-5e 338 0
3 V* V365 Cas S* 01 00 53.1528109537 +56 36 45.161559754   10.82 8.96     S6/3 46 0
4 V* S Cas S* 01 19 41.9752833334 +72 36 40.857560507           S3-54-8 113 1
5 V* W And S* 02 17 32.9610669 +44 18 17.769045   9.62       S7-8/1e-M7Se 204 1
6 V* R Hor Mi* 02 53 52.7746504509 -49 53 22.732999275     3.92 4.99 1.51 M5-7e 169 0
7 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
8 V* R Dor AB* 04 36 45.59127 -62 04 37.7974 7.84 6.98 5.40 2.71 -0.44 M8III:e 282 0
9 V* T Cam S* 04 40 08.8659750793 +66 08 48.691758479 10.72 9.65 7.30     S5-6/5e 110 0
10 V* R Lep C* 04 59 36.3480393629 -14 48 22.511432606 15.06 13.51 7.76 4.90 3.42 C7,6e 315 0
11 V* TX Cam Mi* 05 00 51.1569959503 +56 10 54.093107078       14.02   M9-9.5 328 0
12 IRC +50137 Mi* 05 11 19.4489549676 +52 52 33.222548186           M10 169 0
13 IRC +70066 Mi* 05 46 44.3250774318 +69 58 24.408023024           M9.5 73 0
14 RAFGL 865 C* 06 04 00.04728 +07 25 52.0104           C-rich 95 0
15 HD 259474 * 06 33 09.5706105994 +09 58 39.529165005   10.54 9.55     ~ 3 0
16 V* DY Gem S* 06 35 57.8107866595 +14 12 46.029119392   11.40 11.20     S8,5 54 0
17 V* GX Mon OH* 06 52 47.0411386021 +08 25 19.131304542   15.40 15.46 10.56   M9 105 0
18 V* R Lyn Mi* 07 01 18.0096855380 +55 19 49.727946188   9.58 7.56     S4-6.5/5-6e 117 0
19 V* R Gem S* 07 07 21.2699664341 +22 42 12.750071105 11.74 9.89 7.68 3.75 0.39 S3.5-6.5/6e 186 0
20 V* AA Cam S* 07 14 52.0705916927 +68 48 15.366595788   9.23 7.79     M5S 61 0
21 V* Y Lyn S* 07 28 11.6139802943 +45 59 26.215265764 9.88 8.71 6.98 4.25 1.96 M6S 133 0
22 RAFGL 4078 C* 07 45 02.4140089106 -71 19 45.852846228       15.92 12.72 C 44 0
23 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2133 0
24 V* U Hya C* 10 37 33.2729535 -13 23 04.352923 13.29 7.51 4.82 3.05 1.78 C-N5 283 0
25 V* TT Cen S* 13 19 35.0158270198 -60 46 46.290333346     11.50     SC5:/8+ 48 0
26 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 598 0
27 V* GI Lup S* 15 06 16.3155590069 -41 28 13.855126053     10.40     S7,8e 30 0
28 V* X TrA C* 15 14 19.1744832785 -70 04 46.126632480 15.88 9.19 5.81     C5,5 104 0
29 WOS 48 C* 15 23 05.0744336371 -51 25 58.881494593   17.85 16.66 14.51 10.18 C 118 1
30 V* ST Her S* 15 50 46.6248794228 +48 28 58.809091874   9.09 7.75     M6S-M7SIII: 154 0
31 V* ST Sco S* 16 36 36.2201071224 -31 14 02.441986908   11.36 10.40     S8/4.5 47 0
32 V* RT Sco S* 17 03 32.5563917962 -36 55 13.675752470     7.00     S7,2 64 0
33 V* TV Dra AB* 17 08 24.5033659606 +64 19 08.749158393   11.02 9.68     M8S: 34 0
34 IRC -10401 S* 18 10 24.8191131908 -10 34 15.829851850     16     M7S 23 0
35 IRC +10365 Mi* 18 37 19.2595666948 +10 25 42.492197977           M9 133 0
36 IRC +20370 C* 18 41 54.5507538243 +17 41 08.481183828       13.56   C7,3e 108 0
37 V* ST Sgr S* 19 01 29.1971991570 -12 45 34.111292361   12.13 7.20     S6-7.5/2.5e 67 0
38 HD 176805 * 19 01 49.7317179983 +05 10 16.181512303   8.68 8.24     A5 12 0
39 TYC 470-765-1 * 19 02 03.6130583337 +04 46 08.143780450   13.82 11.76     M0 2 0
40 V* S Lyr S* 19 13 11.8053496248 +26 00 27.847739165           SC 69 0
41 V* W Aql S* 19 15 23.3581458294 -07 02 50.308513461   12.72 10.14     S6/6e 206 0
42 V* EP Vul S* 19 33 17.8368383275 +23 39 19.498655898   15.65 11.00     S6.5/5 51 1
43 V* R Cyg S* 19 36 49.3563270715 +50 11 59.719752717   9.96 6.10   6.447 S4-8/6e 264 1
44 RAFGL 2425 AB* 19 39 00.7432415688 -16 51 56.601810281           M10III 48 0
45 CSS2 41 S* 19 39 07.7682989836 +29 02 38.830749229           S 27 0
46 * chi Cyg S* 19 50 33.9243904 +32 54 50.609683 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 663 0
47 V* RR Aql Mi* 19 57 36.0628075265 -01 53 11.322802573     7.80     M7.5e 275 2
48 V* AA Cyg S* 20 04 27.6056199286 +36 49 00.463589913   10.93 8.79     S6/3 84 0
49 V* DK Vul S* 20 06 33.9520431494 +24 26 00.125562618   12.76 10.99     S4,2 34 0
50 V* V1943 Sgr AB* 20 06 55.2458545503 -27 13 29.754314126   9.25 8.04     M7/8III 67 0
51 IRC -10529 OH* 20 10 27.8733409252 -06 16 13.757843352         15.49 M: 130 0
52 V* RZ Sgr S* 20 15 28.4028079595 -44 24 37.482236482   11.21 10.40     S4,4ep 67 0
53 V* AD Cyg S* 20 31 36.5132998785 +32 33 52.345152578   11.22 8.87     S5/5 55 0
54 V* RV Aqr C* 21 05 51.7378981699 -00 12 42.121668132     11.5     C6,3e 95 0
55 V* T Cep Mi* 21 09 31.7832206157 +68 29 27.190142015 9.15 8.82 7.33     M6-9e 363 0
56 V* RZ Peg Mi* 22 05 52.9711216769 +33 30 24.810194832   11.40 7.60     SC5-9/9-e 145 0
57 V* RX Lac S* 22 49 56.8991009353 +41 03 04.306722519   10.11 8.62     S7.5/1e 48 0
58 V* V386 Cep LP* 22 53 12.3314657743 +61 17 00.550458793           M3Ib 44 0
59 V* WY Cas S* 23 58 01.3075303591 +56 29 13.468672815   12.48 10.76     S6-6.5/6-e 68 0
60 V* R Cas Mi* 23 58 24.8700291935 +51 23 19.691977266 6.71 6.63 4.80     M6.5-9e 677 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:50:03

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