2001A&A...367..189L


Query : 2001A&A...367..189L

2001A&A...367..189L - Astronomy and Astrophysics, volume 367, 189-198 (2001/2-3)

Modeling of C stars with core/mantle grains: amorphous carbon + SiC.

LORENZ-MARTINS S., DE ARAUJO F.X., CODINA-LANDABERRY S.J., DE ALMEIDA W.G. and DE NADER R.V.

Abstract (from CDS):

A set of 45 dust envelopes of carbon stars has been modeled. Among them, 34 were selected according to their dust envelope class (as suggested by Sloan et al., 1998) and 11 are extreme carbon stars. The models were performed using a code that describes the radiative transfer in dust envelopes considering core/mantle grains composed by an α-SiC core and an amorphous carbon (A.C.) mantle. In addition, we have also computed models with a code that considers two kinds of grains - α-SiC and A.C. - simultaneously. Core-mantle grains seem to fit dust envelopes of evolved carbon stars, while two homogeneous grains are more able to reproduce thinner dust envelopes. Our results suggest that there exists an evolution of dust grains in the carbon star sequence. In the beginning of the sequence, grains are mainly composed of SiC and amorphous carbon; with dust envelope evolution, carbon grains are coated in SiC. This phenomena could perhaps explain the small quantity of SiC grains observed in the interstellar medium. However, in this work we consider only α-SiC grains, and the inclusion of β-SiC grains can perhaps change some of these results.

Abstract Copyright:

Journal keyword(s): stars: carbon - circumstellar matter - radiative transfer

Simbad objects: 48

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Number of rows : 48
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* WZ Cas C* 00 01 15.8567946264 +60 21 19.025920224 8.77 9.47 7.13     C-N7III: 310 0
2 V* VX And C* 00 19 54.0161311920 +44 42 33.895984824   12.23 7.80     C-J4.5 154 0
3 V* R Scl C* 01 26 58.0939182720 -32 32 35.439234828 17.26 9.59 5.72 3.69 2.30 C-N5+ 318 0
4 V* R For C* 02 29 15.3077617632 -26 05 55.646585700   12.94 7.50     C4,3e 188 0
5 HD 19557 C* 03 11 25.3268651352 +57 54 11.223823500   10.04 8.59 7.86   C-J4 93 0
6 V* U Cam C* 03 41 48.1758504744 +62 38 54.395692404   11.5 11.00     C-N5 239 0
7 V* ST Cam C* 04 51 13.3487495016 +68 10 07.637629620   9.77 9.20     C-N5 142 0
8 V* TT Tau C* 04 51 31.2645256728 +28 31 36.866648748   11.0 10.20     C-N5+ 90 0
9 V* R Lep C* 04 59 36.3486921120 -14 48 22.502479140 15.06 13.51 7.76 4.90 3.42 C7,6e 327 0
10 V* W Ori C* 05 05 23.7190712856 +01 10 39.454639032 16.36 9.52 6.10 3.83 2.35 C-N5 281 0
11 RAFGL 799 C* 05 40 36.9286934424 +13 48 22.396959792       12.24   C8,4J 41 0
12 V* W Pic C* 05 43 13.8305960304 -46 27 13.825873188   12.52 11.80     C-J5 65 0
13 RAFGL 809 C* 05 43 49.6944851304 +32 42 06.199015788           C-rich 62 0
14 V* Y Tau C* 05 45 39.4101366456 +20 41 42.148590324 15.71 9.90 6.90 4.69 3.19 C-N5- 217 1
15 V* AZ Aur C* 06 01 07.2278104488 +39 40 14.199522420   13.20 10.50     C8,2e 59 0
16 RAFGL 865 C* 06 04 00.04728 +07 25 52.0104           C-rich 98 0
17 V* BL Ori C* 06 25 28.1742350712 +14 43 19.172149392 11.64 8.31 6.00 4.28 2.98 C-N5- 192 0
18 RAFGL 954 C* 06 32 42.1597737408 +43 17 13.217860320   16.56 12.48 11.72   C-rich 36 0
19 V* UU Aur C* 06 36 32.8371036984 +38 26 43.819021608   7.89 5.25 3.31 1.90 C-N5- 297 1
20 RAFGL 971 C* 06 36 54.2452032888 +03 25 28.696182312       18.4   C5,9e 66 0
21 V* CL Mon C* 06 55 36.6904592496 +06 22 43.179553200   12.69 11.00     C-J:6 90 0
22 V* R Vol C* 07 05 36.2081474688 -73 00 52.034502960   14.24 8.70     Ce 81 0
23 V* RY Mon C* 07 06 56.4753359184 -07 33 26.505848700   11.94 7.50     C-N5 91 0
24 V* W CMa C* 07 08 03.4360567560 -11 55 23.796162984 13.44 8.98 6.56 4.86 3.51 C-N5 117 0
25 RAFGL 1085 C* 07 12 04.0051268952 -20 17 23.124543108       14.43   C 57 0
26 [W71b] 021-06 C* 08 10 48.8849951112 -32 52 05.635358940       15.07 12.76 C 55 0
27 V* T Cnc C* 08 56 40.1375904072 +19 50 56.919947352   12.07 7.60     C-N5 130 1
28 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2256 0
29 V* U Ant C* 10 35 12.8510147472 -39 33 45.324020448 15.32 8.22 5.38 3.18 1.86 C-N3 144 0
30 V* U Hya C* 10 37 33.2729535 -13 23 04.352923 13.29 7.51 4.82 3.05 1.78 C-N5 292 0
31 V* V Hya C* 10 51 37.2615873024 -21 15 00.333928044   12.23 6.80     C-N:6 350 0
32 V* SS Vir C* 12 25 14.3948245008 +00 46 10.946740368 15.84 10.79 6.60     C-N4.5: 200 1
33 V* Y CVn C* 12 45 07.8260815656 +45 26 24.926308404 14.03 7.41 4.87 3.12 1.74 C-N5 469 0
34 V* RU Vir C* 12 47 18.4090087128 +04 08 41.356415148   14.75 9.00     C8,1e 170 0
35 V* RY Dra C* 12 56 25.9112361600 +65 59 39.811665876 15.56 9.44 6.34 4.34 2.91 C-N3III: 232 0
36 RAFGL 4211 C* 15 11 41.4444649944 -48 19 58.949705172           C-rich 48 0
37 V* X TrA C* 15 14 19.1755012584 -70 04 46.113298104 15.88 9.19 5.81     C5,5 112 0
38 WOS 48 C* 15 23 05.0730770544 -51 25 58.762691652   17.85 16.66 14.51 10.18 C 127 1
39 RAFGL 2155 C* 18 26 05.83560 +23 28 46.6932         17.63 C-rich 80 0
40 RAFGL 2154 C* 18 26 39.4794045024 -06 54 03.576723228         14.72 C-rich 41 0
41 V* T Lyr C* 18 32 20.0767626264 +36 59 55.635218376   12.74 7.84 7.30   C-J4:p 177 1
42 V* V Aql C* 19 04 24.1544971752 -05 41 05.444321424   11.09 6.90     C-N5 208 0
43 V* AX Cyg C* 19 57 12.5066777184 +44 15 40.037709024 12.97 11.28 7.85     C-N5- 85 0
44 RAFGL 2494 C* 20 01 09.0530414424 +40 55 38.995072680           C 65 0
45 RAFGL 2686 C* 20 59 09.6095179320 +27 26 38.857016112           C8-9,5eJ 51 1
46 V* RV Aqr C* 21 05 51.7376905368 -00 12 42.121057536     11.5     C6,3e 100 0
47 V* V460 Cyg C* 21 42 01.0830893088 +35 30 36.719916552 12.97 8.32 5.84 4.10 2.71 C-N5 206 1
48 RAFGL 3099 C* 23 28 17.1145171968 +10 54 37.402209036           C-rich 89 0

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2022.10.06-09:34:33

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