1999A&A...342..773B


Query : 1999A&A...342..773B

1999A&A...342..773B - Astronomy and Astrophysics, volume 342, 773-784 (1999/2-3)

Dust extinction and intrinsic SEDs of carbon-rich stars. II. The hot carbon stars.

BERGEAT J., KNAPIK A. and RUTILY B.

Abstract (from CDS):

The present work is an extension of a recent study by Knapik & Bergeat (1997A&A...321..236K, henceforth called Paper I) of the spectral energy distributions (SEDs) of about 300 cool carbon-rich variables and of the interstellar extinction observed on their line of sights. The methods were originally developed for Semi-Regular (SR) and Irregular (L)-variables. Shortly, this is a kind of a pair method making use simultaneously of the whole SED from UV to IR. Our approach is applied here to the galactic carbon-rich giants with bluer SEDs, namely the hot carbon (HC) stars, including many ``constant'' stars and a minority of variables: AC Her a RV Tau star, the R Coronae Borealis (RCB) stars and others. Some HdC (i.e. carbon-rich hydrogen deficient stars) and Ba II stars are also considered. The total number of studied HC stars amounts to about 140. With few exceptions, the colour excesses for interstellar extinction are found in good agreement with the field values from maps published in the literature, taking into account the approximate distances to our stars from HIPPARCOS data (1997HIP...C......0E, henceforth called ESA) or binarity. We propose a classification scheme with six photometric groups (or boxes: HC0 to HC5) from the bluest to the reddest SEDs. Oxygen-rich SEDs earlier than HC0, are attributed to the hottest stars (AC Her, most RCB-variables and a few others). Previous findings are confirmed of a junction between oxygen-rich and carbon-rich SEDs at spectral type G. The latest (HC5) group is immediately close to the earliest one in Paper I, namely CV1. The sequence of groups then goes regularly from HC0 to CV6. Substantial infrared excesses with respect to our solutions are found in HD 100764 a HC1 carbon star, AC Her a G0g RV Tau star, and the RCB stars classified in either HC or oxygen-groups. The colour excesses at maximum light can usually be attributed to interstellar reddening, with neutral circumstellar (CS) reddening (large grains) or no CS extinction at all on the line of sight (non spherical geometry) as possible explanations. The latter model (disc or patchy distribution through successive puffs) is favoured. Two RCB variables for which we exploit SEDs on a rising branch (V CrA) or minimum light (RS Tel), show CS laws, respectively a selective extinction compatible with small grains and an extinction partly neutral indicative of large grains on the line of sight.

Abstract Copyright:

Journal keyword(s): stars: carbon - stars: circumstellar matter - stars: AGB and post-AGB - ISM: dust, extinction

VizieR on-line data: <Available at CDS (J/A+A/342/773): table3.dat table4.dat>

Simbad objects: 75

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Number of rows : 75
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 HD 224959 Pe* 00 02 08.0214788256 -02 49 12.232785144   10.6 9.55     C1,1_CH4 92 0
2 HD 26 Pe* 00 05 22.2071891760 +08 47 16.095353028 9.80 9.29 8.25 7.49 7.03 C-H1.5 167 0
3 BD+21 64 C* 00 34 16.2267216984 +22 24 48.373123428   10.97 9.65     C3,3 28 0
4 V* ST Phe C* 00 36 06.2362050672 -55 49 28.198545672   12.76 13.10     N 10 0
5 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.338 12.221 11.704 11.321 CEMP-s 88 0
6 HD 5223 Pe* 00 54 13.6098985200 +24 04 01.515842760   9.88 8.47     C-H2IIIb: 118 0
7 HD 7526 C* 01 14 32.4128751576 -48 15 07.417288512   11.28 10.00     C 21 0
8 HD 10386 C* 01 39 42.2477612952 -59 15 36.050665320   11.50 10.19     C 14 1
9 BD-19 290 C* 01 40 34.1074042896 -18 56 51.519077952   12.41 11.07 10.361 9.783 C1,3 24 0
10 V* V Ari Pe* 02 15 00.0771848760 +12 14 23.612094312   10.8 9.80     C-H3.5 103 0
11 BD-08 456 Pe* 02 28 23.1523308960 -07 21 53.936618544   11.3 9.55     C4:,0+_CH3 21 0
12 HD 16115 Pe* 02 35 06.4987385928 -09 26 34.126056708   9.36 8.15     C-H3II: 71 0
13 HD 24281 C* 03 50 05.8557463368 -43 32 03.533177580   10.09 8.29     C-H4:IIIa: 26 0
14 BD+23 601 C* 04 00 19.2620675352 +23 32 03.425321760   11.8 10.5     C3,3J 23 0
15 V* XX Cam RC* 04 08 38.7489702792 +53 21 39.350441448 8.35 8.10 7.27     F8I 133 0
16 HD 36598 SB* 05 26 38.5524504720 -70 03 48.955581936 10.43 9.35 8.05     K0.5III:Ba3 51 0
17 BD-16 1217 Pe* 05 42 54.7480470000 -16 46 16.448841084   11.22 10.01     K0.5IIIa_CN2 20 0
18 V* SU Tau RC* 05 49 03.7301227728 +19 04 21.867600252   10.72 9.10     C1,0_Hd_CH0 150 1
19 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 735 0
20 V* HR CMa EB* 06 32 46.8731198040 -11 09 58.987412460 8.12 7.35 6.24 5.49 5.01 G9III:Ba3.5 172 0
21 BD+75 348 C* 08 46 11.6352830712 +74 32 31.232954292   10.63 9.54     C3,0_Ba4 38 0
22 HD 76396 Pe* 08 57 58.9267711584 +51 25 47.661787776   9.96 8.85 8.5   C-H2IV: 62 0
23 HD 76846 C* 08 59 48.9396931920 +33 46 26.478155532   10.71 9.42     C-R2+IIIa: 50 0
24 HD 76115 C* 09 00 32.7243377976 +75 25 44.930485956   9.75 8.73     C3,0+ 12 0
25 V* DH UMa C* 09 03 15.2533415856 +50 05 39.372128772   10.99 9.43     C3.5,5J 42 0
26 HD 78278 C* 09 07 57.1211639736 +21 35 12.811606512   12.11 10.59     C3,4J 28 0
27 V* GM Cnc C* 09 13 50.0827820424 +14 12 39.190270356   10.24 8.57     C4,4J 53 0
28 HD 85066 Pe* 09 51 05.3536296240 +52 37 25.436530164   11.48 9.72     C2,3_CH5 34 0
29 HD 88627 Pe* 10 17 36.6529537968 +77 06 43.614137016   12.35 10.83     C3,5_CH5 21 0
30 HD 92626 SB* 10 40 49.9724755488 -48 01 30.370319904 9.53 8.44 7.09     K0_Ba5 87 0
31 BD-18 3055 C* 10 54 41.8899479928 -19 23 21.693832872   11.7 10.6     C2,1 21 0
32 BD+16 2188 RG* 10 56 57.8565481248 +15 16 46.342917192   11.4 10.11     C3,1_CH4 37 0
33 BD+42 2173 Pe* 11 00 00.4406056824 +41 36 07.894442412   11.4 10.08     C3,2_CH4 41 0
34 HD 95405 Pe* 11 00 34.3228350360 -25 51 22.951349820   9.51 8.33     C2,0_CH4 34 0
35 BD+41 2150 Pe* 11 00 48.5526573816 +40 42 10.560847140   11.2 10.03     C3,1_CH3_Ba4 26 0
36 BD+02 2446 Pe* 11 33 49.0532018448 +01 45 08.056158336   11.46 10.17 10.04   C3,3_CH4 29 0
37 HD 100764 Pe* 11 35 42.7476078432 -14 35 36.666013272   9.81 8.79 8.08 7.65 C-H2.5 103 0
38 HD 111908 Pe* 12 52 29.4193997016 +07 12 28.535757156   10.42 9.31     C2,1_CH5 48 0
39 HD 112869 Pe* 12 59 22.6406750088 +37 49 03.688255308 12.83 10.72 8.91 7.79 6.92 C-H4- 85 0
40 BD+04 2735 C* 13 23 15.7166086296 +03 43 47.411285232   11.10 9.64     C1,1 23 0
41 HD 121447 Pe* 13 55 46.9655016048 -18 14 56.486226336 11.50 9.61 7.80     C2,1_CH4:_Ba4 120 0
42 HD 122547 Pe* 14 01 55.4735542368 +32 49 33.301523604 11.72 10.77 9.54 8.70 8.07 C3,3_CH4 48 0
43 HD 129981 WV* 14 46 33.6355780248 -32 10 15.265235964   8.92 8.27 9.14   G5I/IIIpCH 102 0
44 V* S Aps RC* 15 09 24.5365973688 -72 03 45.182766996 11.52 10.86 9.60     C 113 0
45 BD+30 2637 Pe* 15 17 32.1333854112 +29 36 10.231028748   10.78 9.74     C3,0+_CH4 25 0
46 HD 137613 C* 15 27 48.3151103352 -25 10 10.124004468 9.56 8.71 7.54 6.71 6.22 C-Hd1Ib: 99 0
47 BD+65 1055 Pe* 15 27 54.7044524256 +65 22 39.985901724 13.30 11.80 10.34 9.22 8.31 C4:,4_CH4 25 1
48 V* R CrB RC* 15 48 34.4154827352 +28 09 24.295852440 6.44 6.31 5.71 5.26 5.08 G0Iep 768 0
49 CD-61 5300 C* 16 11 50.0797404528 -61 34 38.385089868   11.17 9.90     C1,1 7 0
50 V* RT Nor RC* 16 24 18.6679360920 -59 20 38.565480480   11.34 10.60     R 73 0
51 BD+23 2998 C* 16 47 24.6712810440 +23 12 57.474248868 12.13 11.00 9.80 9.00 8.43 C-R3IIIa: 39 0
52 HD 156074 C* 17 13 31.2405544440 +42 06 22.768253820 9.67 8.75 7.61 6.89 6.42 C-R2III 120 0
53 HD 163838 C* 17 53 42.4853133816 +64 06 56.614638348   11.84 10.72     C2,2 28 0
54 V* WX CrA RC* 18 08 50.4871793760 -37 19 43.210670520   11.75 11.00     R5 59 0
55 V* RS Tel RC* 18 18 51.2223564000 -46 32 53.427456132   10.80 9.96     R0 74 1
56 V* GU Sgr RC* 18 24 15.5810208792 -24 15 26.353387944   11.40 11.33     R0 61 0
57 V* AC Her pA* 18 30 16.2373118976 +21 52 00.599340000 8.00 7.79 7.01     F4Ibp 325 0
58 V* V345 Her Mi* 18 35 54.6171522600 +20 51 23.600060640           ~ 8 1
59 V* V CrA RC* 18 47 32.3131482 -38 09 32.324962   10.67 8.30     R0 103 0
60 V* SV Sge RC* 19 08 11.7737560992 +17 37 41.167903944           R2 63 0
61 V* RY Sgr RC* 19 16 32.7668605944 -33 31 20.340212592 6.20 6.27 6.25     Cpec 358 0
62 HD 187216 Pe* 19 24 18.3437183760 +85 21 57.189325176   11.2 9.56     C3,3_CH5: 70 2
63 HD 189605 C* 20 01 05.1826294416 -07 21 51.922979532   12.51 10.21     C5,5 39 0
64 V* BI Cap C* 20 31 42.9594888912 -11 53 03.555971808   11.2 9.66     C3,4J 29 0
65 HD 197604 Pe* 20 43 34.9805559120 +35 04 22.679960520   10.70 9.28     C4,2_CH8 42 0
66 HD 198269 Pe* 20 48 36.7391782248 +17 50 23.718943680   9.41 8.12     C-H3IV: 82 0
67 HD 198140 C* 20 48 56.8366627200 -19 01 09.057985860   11.46 10.14     R1 26 0
68 HD 201626 Pe* 21 09 59.2755833184 +26 36 55.001033532 9.73 9.26 8.16 7.34 6.82 C-H2IV: 146 0
69 HD 201266 C* 21 10 20.5754825016 -53 42 14.304226896   11.29 9.79     C 17 0
70 HD 202851 Pe* 21 18 43.4865826992 -01 32 03.344479584   10.89 9.67     C3,1_CH4_Ba3 36 0
71 V* U Aqr RC* 22 03 19.6990459464 -16 37 35.281076700   12.16 11.17     C-Hd 89 0
72 HD 216649 C* 22 54 46.4911611576 -06 57 50.622580692   11.96 10.75     R3 21 0
73 V* RU Aqr LP* 23 24 24.3076594008 -17 19 08.712059880   10.47 9.28     M4/5III 33 0
74 HD 223392 C* 23 49 05.4856631856 +06 22 56.648814060   9.87 8.50     C-R3III: 47 0
75 * rho Cas LP* 23 54 23.0325302520 +57 29 57.774737400 7.00 5.85 4.59 3.63 2.89 G2_0 375 0

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2022.05.22-01:02:42

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