2012A&A...540A..72S


Query : 2012A&A...540A..72S

2012A&A...540A..72S - Astronomy and Astrophysics, volume 540A, 72-72 (2012/4-1)

The Spitzer spectroscopic survey of S-type stars.

SMOLDERS K., NEYSKENS P., BLOMMAERT J.A.D.L., HONY S., VAN WINCKEL H., DECIN L., VAN ECK S., SLOAN G.C., CAMI J., UTTENTHALER S., DEGROOTE P., BARRY D., FEAST M., GROENEWEGEN M.A.T., MATSUURA M., MENZIES J., SAHAI R., VAN LOON J.T., ZIJLSTRA A.A., ACKE B., BLOEMEN S., COX N., DE CAT P., DESMET M., EXTER K., LADJAL D., OSTENSEN R., SAESEN S., VAN WYK F., VERHOELST T. and ZIMA W.

Abstract (from CDS):

S-type AGB stars are thought to be in the transitional phase between M-type and C-type AGB stars. Because the composition of the circumstellar environment reflects the photospheric abundances, one may expect a strong influence of the stellar C/O ratio on the molecular chemistry and the mineralogy of the circumstellar dust. In this paper, we present a large sample of 87 intrinsic galactic S-type AGB stars, observed at infrared wavelengths with the Spitzer Space Telescope, and supplemented with ground-based optical data.On the one hand, we derive the stellar parameters from the optical spectroscopy and photometry, using a grid of model atmospheres. On the other, we decompose the infrared spectra to quantify the flux-contributions from the different dust species. Finally, we compare the independently determined stellar parameters and dust properties.For the stars without significant dust emission features, we detect a strict relation between the presence of SiS absorption in the Spitzer spectra and the C/O ratio of the stellar atmosphere. These absorption bands can thus be used as an additional diagnostic for the C/O ratio. For stars with significant dust emission, we define three distinct groups, based on the relative contribution of certain dust species to the infrared flux. We find a strong link between group-membership and C/O ratio. Furthermore, we show that these groups can be explained by assuming that the dust-condensation can be cut short before silicates are produced, while the remaining free atoms and molecules can then be used to form the observed magnesium sulfides or the carriers of the unidentified 13µm and 20µm features. Finally, we present the detection of emission features attributed to molecules and dust characteristic to C-type stars, such as molecular SiS, hydrocarbons and magnesium sulfide grains. We show that we often detect magnesium sulfides together with molecular SiS and we propose that it is formed by a reaction of SiS molecules with Mg.

Abstract Copyright:

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

Simbad objects: 98

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Number of rows : 98
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 S1* 1 S* 00 06 26.0990107680 +68 59 32.155154412   11       S 9 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3841 0
3 V* RX Psc S* 01 25 39.1770197280 +21 23 46.044291480   12.62 11.38 14.01   S 23 0
4 [D75b] Star 6 S* 01 35 09.7108556376 +60 17 09.974733180   15.5       S 8 0
5 [D75b] Star 10 S* 02 19 16.7601285456 +59 42 21.598117956   15.1       MS 9 0
6 V* NX Per S* 04 23 39.3517919040 +49 57 26.098273800           S 12 0
7 S1* 72 S* 04 32 46.4095040520 +37 45 54.270628992   10.7       S 10 0
8 CSS 127 S* 05 12 15.1147220208 +09 17 31.108937280           S! 6 0
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16983 1
10 S1* 119 S* 05 51 12.8950127880 -04 48 06.252914988     13.5 11.99   S 12 0
11 CSS 173 S* 05 56 16.0136729544 -08 03 44.964539064           Sr 6 0
12 S1* 126 S* 06 02 44.2443255120 +35 19 40.594537092       11.13   Sr 10 0
13 V* KR Cam S* 06 04 01.9981377912 +59 32 18.949003368           S! 10 0
14 V* GH Aur S* 06 09 27.7134804552 +28 29 43.496737440       10.72   Swk 16 0
15 V* V376 Aur S* 06 12 01.7190310608 +46 06 40.080855384   14.2       Swk 15 0
16 CD-39 2449 S* 06 12 51.1783075512 -39 33 25.657390188   13.11 10.83     S5,6 11 0
17 V* CF Gem S* 06 27 15.3398969856 +18 04 23.609884260           S 15 0
18 V* NP Aur S* 06 28 01.8021043320 +36 04 59.039512104           M5:S 15 0
19 V* V355 CMa S* 06 32 52.3081674696 -26 10 23.870593380   12.0 10.8     S 18 1
20 S1* 185 S* 06 50 17.7694761864 +02 13 23.858363424           S 10 0
21 V* BZ CMa S* 06 56 45.4001724072 -25 53 42.107294004     13.00 10.87   S 14 0
22 S1* 196 S* 06 57 48.9547299264 -06 49 10.125270948           S 10 0
23 CPD-19 1672 S* 07 03 12.0278724912 -19 47 45.918711780   11.52 9.81     S3*3 9 0
24 MC79 1-13 S* 07 03 46.0865697816 -00 37 28.739812656           S4:*3 7 0
25 CD-43 2976 S* 07 09 14.0665153440 -43 49 06.219157584     11.30     S 5 0
26 V* XY CMi S* 07 16 43.2873107256 +03 06 58.373767296           S-*3 19 0
27 CD-30 4223 S* 07 16 45.8554838928 -30 19 44.111084340   12.76 10.23     S 14 0
28 Hen 3-50 S* 07 24 05.3931091632 -82 44 57.972821028     13.00     Se 13 0
29 S1* 234 S* 07 27 11.0939221968 -22 12 35.742776256           S 7 0
30 WRAY 18-16 S* 07 30 55.2409383624 -31 03 25.193181744     12.50     S 9 0
31 BM VII 1 S* 07 36 44.0542734432 -23 40 42.823308504     13.3     S/6- 17 0
32 WRAY 18-24 S* 07 42 38.2937443560 -25 51 15.434023320     11.70     S3,8 12 0
33 S1* 269 S* 07 51 47.4570623040 -22 33 58.578977448     13.0 11.33   S/6+e 14 0
34 WOS 3 S* 07 53 46.2338806728 -32 04 55.211456136     14.2     S/6+e 10 0
35 V* AO Gem S* 07 56 56.0096458152 +31 10 02.280885636       13.79   S!e 19 0
36 WRAY 18-37 S* 07 57 57.6477810048 -29 37 32.063521980     13 11.30   S5,8e 19 0
37 V* EX Pup S* 08 00 38.3126385960 -20 59 35.294194716       10.71   S2*4e 15 0
38 MC79 1-53 S* 08 02 49.0825568376 -41 54 08.918421336           S3:*4 5 0
39 S1* 288 S*? 08 04 09.3511301328 -43 06 43.836583896   13.52 11.35     MS:p 7 1
40 CSS 454 S* 08 04 40.8861230688 -03 04 25.762616760   12.39 10.39     S 10 0
41 WRAY 18-49 S* 08 07 49.7895681168 -35 53 59.747715960     10     Se 16 0
42 MC79 1-57 S* 08 09 07.8757187760 -43 16 46.429279068           S4:*2: 6 0
43 CSS 478 S* 08 11 36.3403689696 -55 39 11.475500940   13.69 11.06     S4*2 5 0
44 MC79 1-58 S* 08 15 22.7805027816 -29 43 46.894155456   12.63 10.87     S5*2 7 0
45 CD-29 5912 S* 08 18 29.0594622192 -29 56 17.416873572   12.12 10.79     S4,4 16 0
46 HD 233517 * 08 22 46.7147840400 +53 04 49.230337440   10.85 9.71     K2 89 0
47 MC79 1-70 S* 08 33 27.8684006352 -47 14 15.087599628           S2*4 8 0
48 S1* 319 S* 08 34 29.1354121944 -52 47 22.678406916       12.32   S 11 0
49 V* CO Pyx S* 08 45 08.9639407056 -25 59 08.426328504   10.5 10.67 11.04   S4*3 19 0
50 MC79 1-73 S* 08 48 35.5070800584 -38 25 53.286215304           S4*4 5 0
51 WRAY 18-113 S* 08 50 01.2682752936 -57 08 33.610071552     12.50     S7,8e 8 0
52 WRAY 18-126 S* 09 06 53.6646928944 -40 50 40.724473380     12.80 11.54   S5,8 14 0
53 WRAY 18-132 S* 09 11 32.1927419568 -53 48 45.259535484     13.10     S 10 0
54 WOS 11 S* 09 16 09.9691520832 -55 39 48.089409516     16     S/6- 11 0
55 CD-30 7391 S* 09 17 23.7115710048 -30 36 20.324819088   12.02 10.54     S5*3 6 0
56 WRAY 18-143 S* 09 33 37.6350036912 -42 29 03.229906272   15.687 12.760     S 11 0
57 WRAY 18-154 S* 09 40 26.5734698784 -46 17 06.195235164     13.50     S 7 0
58 WRAY 18-161 S* 09 47 06.0317433744 -47 04 51.687098400     15.00     S 11 0
59 S1* 372 S* 09 47 48.8534004792 -47 29 03.637153860           S 7 0
60 WRAY 18-168 S* 09 49 44.9234617344 -63 58 57.811228608     13.50     S 8 0
61 WRAY 18-177 S* 09 59 10.2374204328 -49 58 19.885677528     11.20     S4,2 9 0
62 WRAY 18-182 S* 10 05 26.3787093576 -61 10 15.317554548     12.70     Se 16 0
63 WRAY 18-186 S* 10 06 09.0011093376 -60 10 37.018463916           SCe 20 0
64 WRAY 18-192 S* 10 14 27.4329038592 -51 10 20.542987668     13.20     S 9 0
65 V* AU Car S* 10 25 29.7335081328 -61 50 59.085052080           MS 13 0
66 WRAY 18-200 S* 10 27 40.5266132736 -52 13 11.489867724     11.60     S4,6 11 0
67 V* RX Car S* 10 36 45.9296598600 -62 19 16.146237900           MS 15 0
68 WRAY 18-219 S* 11 01 01.1259699696 -62 26 32.627529708     12.20     S 10 0
69 WRAY 18-221 S* 11 02 05.3692713888 -56 31 33.656283768     12.5     S/6-e: 14 0
70 WOS 21 S* 11 06 01.0241210832 -62 45 12.323344572     13.3     S 9 0
71 V* V600 Car S* 11 06 02.8232774472 -68 36 32.801671260     10.6     S4,2 13 0
72 CSS 739 S* 11 19 23.9067879168 -47 57 52.448634828     11.41     S4*4 11 0
73 BM VII 13 S* 11 25 27.0044564928 -61 15 33.227868996           S 12 0
74 WRAY 18-235 S* 11 33 29.7071956080 -68 03 49.957826832   16.039 13.463     S 13 0
75 HD 100764 Pe* 11 35 42.7476078432 -14 35 36.666013272   9.81 8.79 8.08 7.65 C-H2.5 105 0
76 WRAY 18-239 S* 11 44 30.2838489168 -65 31 44.679703548     12.60     S 7 0
77 WRAY 18-244 S* 12 07 33.2241337176 -57 25 01.508120148   13.272 11.281 10.840   S 7 0
78 WRAY 18-250 S* 12 26 36.6032092800 -52 25 24.650886000           S7,8e 19 0
79 WOS 35 s?r 12 48 33.8013126840 -62 04 51.863358864     14.8     M2 7 1
80 S1* 493 S* 15 17 28.7290492272 -61 18 45.472987296           S 7 0
81 MC79 1-171 S* 16 24 31.2905937816 -54 56 51.247611384           S4:*2 6 0
82 S1* 529 S* 17 27 22.8381568464 -24 32 00.997497888           S 12 0
83 CSS 1005 S* 17 51 33.1607686872 -06 24 03.508890084       11.29   S! 7 0
84 CSS 1046 S* 18 28 25.6547211792 +17 19 43.043226348           S!r 7 0
85 MC79 1-200 S* 18 47 41.7315800976 -07 10 22.238954688     11.9 11.21 8.55 S4*4 5 0
86 V* TU Dra S* 18 51 30.1321187304 +48 54 42.965321076     9.820   7.563 M6S 18 0
87 V* W Aql S* 19 15 23.3572741560 -07 02 50.333886492   12.72 10.14 10.21   S6/6e 228 0
88 V* V734 Cyg S* 19 24 46.7101221048 +44 28 56.480434752     12.936 10.91 8.994 M2-6Se 20 0
89 CSS 1138 S* 19 26 37.3830228096 +42 23 38.429247156   14.26 12.51 11.83 8.157 S 8 0
90 V* V1717 Aql S* 19 49 01.5058921680 +00 29 11.572511100           S!r 11 1
91 V* CM Cyg S* 19 58 34.2531008880 +52 05 45.787293744   10.0   10.43   S4/6.5e 23 0
92 V* V899 Aql S* 20 01 29.4466506552 +04 25 36.423562080           S 16 0
93 * pi.01 Gru S* 22 22 44.2083897000 -45 56 52.791160956 10.52 8.62 6.55 3.19 0.52 S5,7: 187 0
94 V* CE Lac S* 22 43 44.8782813576 +43 26 00.296696580           Swk 10 0
95 V* GY Lac S* 22 47 46.1707262760 +55 18 13.024874952       11.33   S 16 0
96 BD+02 4571 S* 22 51 31.9714521888 +03 42 24.466171680   11.10 9.42     M3S 6 0
97 S1* 735 S* 23 35 46.7032603296 +54 41 36.396690252           MS 6 0
98 NAME Galactic Bulge reg ~ ~           ~ 4167 0

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2023.09.27-17:30:10

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