2013A&A...550A..78S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:00:21

2013A&A...550A..78S - Astronomy and Astrophysics, volume 550A, 78-78 (2013/2-1)

The abundance of HCN in circumstellar envelopes of AGB stars of different chemical type.

SCHOEIER F.L., RAMSTEDT S., OLOFSSON H., LINDQVIST M., BIEGING J.H. and MARVEL K.B.

Abstract (from CDS):

A multi-transition survey of HCN (sub-) millimeter line emission from a large sample of asymptotic giant branch (AGB) stars of different chemical type is presented. The data are analysed and circumstellar HCN abundances are estimated. The sample stars span a large range of properties such as mass-loss rate and photospheric C/O-ratio. The analysis of the new data allows for more accurate estimates of the circumstellar HCN abundances and puts new constraints on chemical models. In order to constrain the circumstellar HCN abundance distribution a detailed non-local thermodynamic equilibrium (LTE) excitation analysis, based on the Monte Carlo method, is performed. Effects of line overlaps and radiative excitation from dust grains are included. The median values for the derived abundances of HCN (with respect to H2) are 3x10–5, 7x10–7 and 10–7 for carbon stars (25 stars), S-type AGB stars (19 stars) and M-type AGB stars (25 stars), respectively. The estimated sizes of the HCN envelopes are similar to those obtained in the case of SiO for the same sample of sources and agree well with previous results from interferometric observations, when these are available. We find that there is a clear dependence of the derived circumstellar HCN abundance on the C/O-ratio of the star, in that carbon stars have about two orders of magnitude higher abundances than M-type AGB stars, on average. The derived HCN abundances of the S-type AGB stars have a larger spread and typically fall in between those of the two other types, however, slightly closer to the values for the M-type AGB stars. For the M-type stars, the estimated abundances are much higher than what would be expected if HCN is formed in thermal equilibrium. However, the results are also in contrast to predictions from recent non-LTE chemical models, where very little difference is expected in the HCN abundances between the various types of AGB stars.

Abstract Copyright:

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

Simbad objects: 69

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Number of rows : 69

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* KU And Mi* 00 06 52.7551927308 +43 05 02.356209801       14.12   M10 73 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 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 396 0
4 V* HV Cas C* 01 11 03.4682980461 +53 43 40.237002902     12.90     C4,3e 75 0
5 V* S Cas S* 01 19 41.9752833334 +72 36 40.857560507           S3-54-8 113 1
6 V* W And S* 02 17 32.9610669 +44 18 17.769045   9.62       S7-8/1e-M7Se 204 1
7 V* R For C* 02 29 15.3081251463 -26 05 55.647016467   12.94 7.50     C4,3e 178 0
8 V* V656 Cas Mi* 02 35 44.6722632710 +65 08 58.930707399           M9.5III 59 0
9 V* R Hor Mi* 02 53 52.7746504509 -49 53 22.732999275     3.92 4.99 1.51 M5-7e 169 0
10 LEE 259 C* 03 26 29.5050382299 +47 31 48.463099623           N 165 0
11 HD 232820 C* 03 41 29.5964469751 +51 30 11.731294715   12.14 8.140     C5,5_MS4 64 0
12 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
13 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
14 V* ST Cam C* 04 51 13.3478339517 +68 10 07.646494913   9.77 9.20     C-N5 136 0
15 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
16 V* TX Cam Mi* 05 00 51.1569959503 +56 10 54.093107078       14.02   M9-9.5 328 0
17 V* W Ori C* 05 05 23.7201883024 +01 10 39.459119918 16.36 9.52 6.10 3.83 2.35 C-N5 272 0
18 IRC +50137 Mi* 05 11 19.4489549676 +52 52 33.222548186           M10 169 0
19 V* S Aur C* 05 27 07.4588448362 +34 08 58.844765355   13.48 8.20     C-N5+ 116 0
20 V* W Pic C* 05 43 13.8312608587 -46 27 13.823901997   12.52 11.80     C-J5 60 0
21 IRC +70066 Mi* 05 46 44.3250774318 +69 58 24.408023024           M9.5 73 0
22 V* AP Lyn Mi* 06 34 33.3973987916 +60 56 27.785534488   12.51 11.15 11.90   M7+ 106 0
23 V* UU Aur C* 06 36 32.8375658812 +38 26 43.833646997   7.89 5.25 3.31 1.90 C-N5- 290 1
24 V* GX Mon OH* 06 52 47.0411386021 +08 25 19.131304542   15.40 15.46 10.56   M9 105 0
25 V* R Lyn Mi* 07 01 18.0096855380 +55 19 49.727946188   9.58 7.56     S4-6.5/5-6e 117 0
26 V* R Vol C* 07 05 36.2092864981 -73 00 52.021676008   14.24 8.70     Ce 77 0
27 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
28 * L02 Pup AB* 07 13 32.3181035 -44 38 23.062946 7.90 6.66 5.10 2.49 0.07 M5IIIe 188 0
29 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
30 V* X Cnc C* 08 55 22.8824572992 +17 13 52.585346790   9.63 6.40 4.29 2.90 C-N4.5 256 1
31 V* IW Hya OH* 09 45 15.2271331857 -22 01 45.289428464     16     M8/9 106 0
32 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 870 1
33 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2133 0
34 V* RW LMi C* 10 16 02.2834693816 +30 34 18.977096332       15.27   C4,3e 379 0
35 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
36 V* R Crt AB* 11 00 33.8541158313 -18 19 29.574953304   10.33 9.80     M7/8III 191 0
37 V* Y CVn C* 12 45 07.8257032577 +45 26 24.898861195 14.03 7.41 4.87 3.12 1.74 C-N5 461 0
38 V* RT Vir AB* 13 02 37.9836301550 +05 11 08.360733054 10.07 9.07 7.41     M8III 293 0
39 V* SW Vir AB* 13 14 04.3908742003 -02 48 25.155302846 9.24 8.52 6.85     M7III: 245 0
40 V* TT Cen S* 13 19 35.0158270198 -60 46 46.290333346     11.50     SC5:/8+ 48 0
41 V* R Hya Mi* 13 29 42.7818674 -23 16 52.774679 7.26 6.58 4.97 2.27 -0.15 M6-9e 459 0
42 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 598 0
43 V* RX Boo AB* 14 24 11.6240733185 +25 42 13.381760051   9.23 8.60     M7.5-M8 416 0
44 V* X TrA C* 15 14 19.1744832785 -70 04 46.126632480 15.88 9.19 5.81     C5,5 104 0
45 WOS 48 C* 15 23 05.0744336371 -51 25 58.881494593   17.85 16.66 14.51 10.18 C 118 1
46 V* RT Sco S* 17 03 32.5563917962 -36 55 13.675752470     7.00     S7,2 64 0
47 IRC -10401 S* 18 10 24.8191131908 -10 34 15.829851850     16     M7S 23 0
48 IRC +10365 Mi* 18 37 19.2595666948 +10 25 42.492197977           M9 133 0
49 IRC +20370 C* 18 41 54.5507538243 +17 41 08.481183828       13.56   C7,3e 108 0
50 IRC -30398 AB* 18 59 13.8657889129 -29 50 20.243409063   14.35 14.19 15.46   M9 42 0
51 V* ST Sgr S* 19 01 29.1971991570 -12 45 34.111292361   12.13 7.20     S6-7.5/2.5e 67 0
52 V* V Aql C* 19 04 24.1548619887 -05 41 05.434251344   11.09 6.90     C-N5 202 0
53 V* S Lyr S* 19 13 11.8053496248 +26 00 27.847739165           SC 69 0
54 V* W Aql S* 19 15 23.3581458294 -07 02 50.308513461   12.72 10.14     S6/6e 206 0
55 V* UX Dra C* 19 21 35.5158242859 +76 33 34.549597671   8.81 5.94     C-N5 186 0
56 V* EP Vul S* 19 33 17.8368383275 +23 39 19.498655898   15.65 11.00     S6.5/5 51 1
57 V* R Cyg S* 19 36 49.3563270715 +50 11 59.719752717   9.96 6.10   6.447 S4-8/6e 264 1
58 * 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
59 V* RR Aql Mi* 19 57 36.0628075265 -01 53 11.322802573     7.80     M7.5e 275 2
60 IRC -10529 OH* 20 10 27.8733409252 -06 16 13.757843352         15.49 M: 130 0
61 V* RZ Sgr S* 20 15 28.4028079595 -44 24 37.482236482   11.21 10.40     S4,4ep 67 0
62 V* V Cyg C* 20 41 18.2688237607 +48 08 28.886946369   14.05 7.70     C7,4eJ 290 0
63 V* RV Aqr C* 21 05 51.7378981699 -00 12 42.121668132     11.5     C6,3e 95 0
64 V* S Cep C* 21 35 12.8240104870 +78 37 28.201592479   12.13 7.40     C7,3e 245 0
65 V* RZ Peg Mi* 22 05 52.9711216769 +33 30 24.810194832   11.40 7.60     SC5-9/9-e 145 0
66 RAFGL 3068 C* 23 19 12.60744 +17 11 33.1332           C 249 0
67 IRC +40540 C* 23 34 27.5215563443 +43 33 01.299562617     15.12     C8,3.5eJ 170 0
68 V* WY Cas S* 23 58 01.3075303591 +56 29 13.468672815   12.48 10.76     S6-6.5/6-e 68 0
69 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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2020.07.03-22:00:21

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