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


Query : 2018A&A...617A.132D

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 - 2022
#notes
1 V* T Cet S* 00 21 46.2731778 -20 03 28.884826   7.32 5.74     M5-6Se 143 0
2 V* R And S* 00 24 01.9457463096 +38 34 37.370144352 10.61 9.36 7.39 4.45 2.30 S5-7/4-5e 344 0
3 V* V365 Cas S* 01 00 53.1531773712 +56 36 45.160036560   10.82 8.96     S6/3 49 0
4 V* S Cas S* 01 19 41.9796588720 +72 36 40.850697240           S3-54-8 118 1
5 V* W And S* 02 17 32.9610669 +44 18 17.769045   9.62       S7-8/1e-M7Se 208 1
6 V* R Hor Mi* 02 53 52.7701013592 -49 53 22.730520228     3.92 4.99 1.51 M5-7e 176 0
7 V* IK Tau Mi* 03 53 28.8924743304 +11 24 21.895183368 16.99 17.03 13.39 7.29 3.20 M7-11 602 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 322 0
9 V* T Cam S* 04 40 08.8691608872 +66 08 48.640486308 10.72 9.65 7.30     S5-6/5e 113 0
10 V* R Lep C* 04 59 36.3486921120 -14 48 22.502479140 15.06 13.51 7.76 4.90 3.42 C7,6e 326 0
11 V* TX Cam Mi* 05 00 51.1627935408 +56 10 54.041462220       14.02   M9-9.5 341 0
12 IRC +50137 Mi* 05 11 19.4506093584 +52 52 33.235824324           M10 172 0
13 IRC +70066 Mi* 05 46 44.3288397432 +69 58 24.422766636           M9.5 81 0
14 RAFGL 865 C* 06 04 00.04728 +07 25 52.0104           C-rich 98 0
15 HD 259474 * 06 33 09.5705824488 +09 58 39.525591288   10.54 9.55     ~ 3 0
16 V* DY Gem S* 06 35 57.8113561320 +14 12 46.026222696   11.40 11.20     S8,5 56 0
17 V* GX Mon OH* 06 52 47.0423680104 +08 25 19.097958468   15.40 15.46 10.56   M9 112 0
18 V* R Lyn Mi* 07 01 18.0100735008 +55 19 49.729839924   9.58 7.56     S4-6.5/5-6e 121 0
19 V* R Gem S* 07 07 21.2705134872 +22 42 12.747215448 11.74 9.89 7.68 3.75 0.39 S3.5-6.5/6e 192 0
20 V* AA Cam S* 07 14 52.0696706376 +68 48 15.359511204   9.23 7.79     M5S 67 0
21 V* Y Lyn S* 07 28 11.6165714400 +45 59 26.229456564 9.88 8.71 6.98 4.25 1.96 M6S 137 0
22 RAFGL 4078 C* 07 45 02.4149777160 -71 19 45.862198392       15.92 12.72 C 51 0
23 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2246 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 291 0
25 V* TT Cen S* 13 19 35.0158771776 -60 46 46.295369400     11.50     SC5:/8+ 52 0
26 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 623 0
27 V* GI Lup S* 15 06 16.3144281432 -41 28 13.869517044     10.40     S7,8e 34 0
28 V* X TrA C* 15 14 19.1755012584 -70 04 46.113298104 15.88 9.19 5.81     C5,5 111 0
29 WOS 48 C* 15 23 05.0730770544 -51 25 58.762691652   17.85 16.66 14.51 10.18 C 126 1
30 V* ST Her S* 15 50 46.6232210160 +48 28 58.850853780   9.09 7.75     M6S-M7SIII: 158 0
31 V* ST Sco S* 16 36 36.2192115984 -31 14 02.427110736   11.36 10.40     S8/4.5 49 0
32 V* RT Sco S* 17 03 32.5593710616 -36 55 13.694502792     7.00     S7,2 70 0
33 V* TV Dra AB* 17 08 24.5029355616 +64 19 08.745822588   11.02 9.68     M8S: 38 0
34 IRC -10401 S* 18 10 24.8131426752 -10 34 15.909217320     16     M7S 26 0
35 IRC +10365 Mi* 18 37 19.2583829328 +10 25 42.492195300           M9 142 0
36 IRC +20370 C* 18 41 54.5501446200 +17 41 08.425834728       13.56   C7,3e 113 0
37 V* ST Sgr S* 19 01 29.1966290472 -12 45 34.097956812   12.13 7.20     S6-7.5/2.5e 70 0
38 HD 176805 * 19 01 49.7316301488 +05 10 16.181317704   8.68 8.24     A5 13 0
39 TYC 470-765-1 * 19 02 03.6127513656 +04 46 08.143837572   13.82 11.76     M0 2 0
40 V* S Lyr S* 19 13 11.8046954880 +26 00 27.853438788           SC 71 0
41 V* W Aql S* 19 15 23.3572741560 -07 02 50.333886492   12.72 10.14     S6/6e 217 0
42 V* EP Vul S* 19 33 17.8371536064 +23 39 19.506133512   15.65 11.00     S6.5/5 54 1
43 V* R Cyg S* 19 36 49.3579856496 +50 11 59.727536988   9.96 6.10   6.447 S4-8/6e 268 1
44 RAFGL 2425 Mi* 19 39 00.7388220744 -16 51 56.630561580           M10III 51 0
45 CSS2 41 S* 19 39 07.7681302752 +29 02 38.840060832           S 29 0
46 * chi Cyg S* 19 50 33.9213430345 +32 54 50.575531294 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 679 0
47 V* RR Aql Mi* 19 57 36.0616870728 -01 53 11.339520360     7.80     M7.5e 287 2
48 V* AA Cyg S* 20 04 27.6062351064 +36 49 00.458592240   10.93 8.79     S6/3 89 0
49 V* DK Vul S* 20 06 33.9524469312 +24 26 00.133136196   12.76 10.99     S4,2 36 0
50 V* V1943 Sgr AB* 20 06 55.2441583872 -27 13 29.766501516   9.25 8.04     M7/8III 72 0
51 IRC -10529 OH* 20 10 27.8731455576 -06 16 13.758742596         15.49 M: 136 0
52 V* RZ Sgr S* 20 15 28.4023889376 -44 24 37.478466072   11.21 10.40     S4,4ep 71 0
53 V* AD Cyg S* 20 31 36.5133153840 +32 33 52.355493648   11.22 8.87     S5/5 59 0
54 V* RV Aqr C* 21 05 51.7376905368 -00 12 42.121057536     11.5     C6,3e 100 0
55 V* T Cep Mi* 21 09 31.7834766408 +68 29 27.231070884 9.15 8.82 7.33     M6-9e 373 0
56 V* RZ Peg Mi* 22 05 52.9706535288 +33 30 24.810555528   11.40 7.60     SC5-9/9-e 151 0
57 V* RX Lac S* 22 49 56.8993161696 +41 03 04.307827176   10.11 8.62     S7.5/1e 50 0
58 V* V386 Cep LP* 22 53 12.3313692888 +61 17 00.548668032     10.79     M3Ib 47 0
59 V* WY Cas S* 23 58 01.3064089800 +56 29 13.475449716   12.48 10.76     S6-6.5/6-e 71 0
60 V* R Cas Mi* 23 58 24.8682785040 +51 23 19.713029388 6.71 6.63 4.80     M6.5-9e 691 0

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2022.08.10-18:50:13

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