2016A&A...586A.158J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST21:45:50

2016A&A...586A.158J - Astronomy and Astrophysics, volume 586A, 158-158 (2016/2-1)

Binary properties of CH and carbon-enhanced metal-poor stars.

JORISSEN A., VAN ECK S., VAN WINCKEL H., MERLE T., BOFFIN H.M.J., ANDERSEN J., NORDSTROEM B., UDRY S., MASSERON T., LENAERTS L. and WAELKENS C.

Abstract (from CDS):

The HERMES spectrograph installed on the 1.2-m Mercator telescope has been used to monitor the radial velocity of 13 low-metallicity carbon stars, among which seven carbon-enhanced metal-poor (CEMP) stars and six CH stars (including HIP 53522, a new member of the family, as revealed by a detailed abundance study). All stars but one show clear evidence for binarity. New orbits are obtained for eight systems. The sample covers an extended range in orbital periods, extending from 3.4d (for the dwarf carbon star HE 0024-2523) to about 54yr (for the CH star HD 26, the longest known among barium, CH, and extrinsic S stars). Three systems exhibit low-amplitude velocity variations with periods close to 1yr superimposed on a long-term trend. In the absence of an accurate photometric monitoring of these systems, it is not clear yet whether these variations are the signature of a very low-mass companion or of regular envelope pulsations. The period - eccentricity (P-e) diagram for the 40 low-metallicity carbon stars with orbits now available shows no difference between CH and CEMP-s stars (the latter corresponding to those CEMP stars enriched in s-process elements, as are CH stars). We suggest that they must be considered as one and the same family and that their different names only stem from historical reasons. Indeed, these two families have as well very similar mass-function distributions, corresponding to companions with masses in the range 0.5-0.7M, indicative of white-dwarf companions, adopting 0.8-0.9M for the primary component. This result confirms that CH and CEMP-s stars obey the same mass-transfer scenario as their higher-metallicity analogues, barium stars. The P-e diagrams of barium, CH, and CEMP-s stars are indeed very similar. They reveal two different groups of systems: one with short orbital periods (P<1000d) and mostly circular or almost circular orbits, and another with longer period and eccentric (e>0.1) orbits. These two groups either trace different evolutionary channels during the mass-transfer episode responsible for the chemical peculiarities of the Ba/CH/CEMP-s stars, or result from the operation of tidal circularisation in a more recent past, when the current giant star was ascending the first giant branch.

Abstract Copyright:

Journal keyword(s): binaries: general - stars: carbon

VizieR on-line data: <Available at CDS (J/A+A/586/A158): table1.dat rv.dat>

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 - 2020
#notes
1 HD 224959 Pe* 00 02 08.0224361239 -02 49 12.239963584   10.6 9.55     C1,1_CH4 85 0
2 HD 26 Pe* 00 05 22.2077761394 +08 47 16.096990670 9.80 9.29 8.25 7.49 7.03 C-H1.5 161 0
3 HE 0002-1037 Pe* 00 05 23.0071176789 -10 20 24.702977385   14.74 13.68 13.59   CEMP-s 6 0
4 C* 3221 Pe* 00 20 21.5999105195 +01 12 06.814621800   12.991 11.66 10.773 10.186 CEMP-s 17 0
5 HE 0024-2523 Pe* 00 27 27.6485410349 -25 06 28.291081599 15.067 15.32 14.91     CEMP-s 65 0
6 BD+29 95 Pe* 00 32 05.1243394632 +30 32 38.983392385   11.4 10.18     C3,0_CH4 23 0
7 CD-24 266 BS* 00 40 47.9313778053 -24 07 34.183052519   12.955 12.656 12.441 12.216 CEMP-s 90 0
8 SKB 2 Pe* 00 41 39.8197261334 -26 18 54.463949137   13.338 12.221 11.704 11.321 C1,2 83 0
9 CD-31 306 BS* 00 50 15.7694437410 -30 59 56.199734557   12.73 12.72     F3VkA2mA2 30 0
10 HD 5223 Pe* 00 54 13.6094686085 +24 04 01.522268338   9.88 8.47     C-H2IIIb: 111 0
11 CD-26 304 Pe* 00 57 18.1376089543 -25 26 09.699477820   13.57 12.69 12.198 11.759 CEMP-s 61 1
12 SKB 5 Pe* 01 13 46.4932532618 -13 30 48.983872922   14.0 12.5 11.857 11.361 C1,3 15 1
13 HE 0151-0341 Pe* 01 53 43.3048643746 -03 27 14.457170791   14.67 13.40   12.521 CEMP-s 7 0
14 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
15 HE 0319-0215 Pe* 03 21 46.2601268023 -02 04 33.952328750   15.03 13.60   12.603 CEMP-s 9 0
16 G 77-61 Pe* 03 32 38.0871477505 +01 58 00.010460312   15.60 13.90 12.9   dC-J_CH5 124 0
17 HE 0430-1609 Pe* 04 32 50.9248212529 -16 03 38.846382184   14.48 13.10 12.527 12.008 CEMP-s 9 0
18 HD 30443 Pe* 04 49 16.0206954611 +35 00 06.478684166   11.2 8.82     C5,3_CH9_CN6.5_Ba7 50 0
19 HE 0457-1805 C* 04 59 43.5585706535 -18 01 11.982485082   12.372 11.014     C 6 0
20 HE 0507-1653 Pe* 05 09 16.5601563677 -16 50 04.690009743   13.633 12.507 12.002 11.579 CEMP-s 18 0
21 HE 0507-1430 Pe* 05 10 07.6176498155 -14 26 31.742581973   16.06 14.40 13.693 13.104 C 9 0
22 BD+75 348 C* 08 46 11.6378906707 +74 32 31.237557585   10.63 9.54     C3,0_Ba4 36 0
23 2MASS J08573053+0139504 Pe* 08 57 30.5343227407 +01 39 50.449455813   15.907 14.983 14.501 14.071 CEMP-s 5 0
24 HD 76396 Pe* 08 57 58.9268837754 +51 25 47.662244925   9.96 8.85 8.5   C-H2IV: 58 0
25 HD 85066 Pe* 09 51 05.3534057277 +52 37 25.438020119   11.48 9.72     C2,3_CH5 32 0
26 HE 1046-1352 Pe* 10 48 29.9237884759 -14 08 11.827506657   15.390 14.714 14.309 13.879 CEMP-s 8 0
27 BD+16 2188 Pe* 10 56 57.8562802750 +15 16 46.344827631   11.4 10.11     C3,1_CH4 33 0
28 BD+42 2173 Pe* 11 00 00.4407383562 +41 36 07.905552269   11.4 10.08     C3,2_CH4 37 0
29 BD+41 2150 Pe* 11 00 48.5529266718 +40 42 10.557451801   11.2 10.03     C3,1_CH3_Ba4 22 0
30 HE 1120-2122 C* 11 23 18.6220231246 -21 38 32.305399932   13.303 11.795 11.126 10.568 C 6 0
31 HD 111908 Pe* 12 52 29.4211169149 +07 12 28.501368648   10.42 9.31     C2,1_CH5 46 0
32 HE 1429-0551 Pe* 14 32 31.2973539286 -06 05 00.200024781   14.015 12.606 11.995 11.537 CEMP-s 18 0
33 HE 1523-1155 Pe* 15 26 41.0447354853 -12 05 42.658748491   14.571 13.225 12.622 12.138 CEMP-s 17 0
34 HD 145777 Pe* 16 13 13.8687901662 -15 12 01.247058546   11.55 10.31     C1:,1_CH3: 26 0
35 BD+19 3109 Pe* 16 29 26.9948289913 +19 30 34.469607826 13.16 11.88 10.29 9.875 8.78 C1,1_CH4 33 0
36 BD+02 3336 C* 17 31 23.2569673761 +01 58 33.159188589 13.34 11.31 9.40 8.12 7.14 C-N5III: 43 0
37 HD 187216 Pe* 19 24 18.3451130483 +85 21 57.185833557   11.2 9.56     C3,3_CH5: 67 2
38 IRAS 19417+1701 PN 19 43 59.5110389170 +17 09 00.957899325   11.2   10.6   ~ 42 0
39 BD+57 2161 Pe* 20 14 07.7503937767 +58 06 19.420419723   11.3 9.68     C4,1_CH3_Ba4 25 0
40 HD 198269 Pe* 20 48 36.7373846084 +17 50 23.700525129   9.41 8.12     C-H3IV: 77 0
41 HD 201626 Pe* 21 09 59.2669493692 +26 36 55.010503706 9.73 9.26 8.16 7.34 6.82 C-H2IV: 139 0
42 HD 202851 Pe* 21 18 43.4852973493 -01 32 03.339964535   10.89 9.67     C3,1_CH4_Ba3 28 0
43 HE 2134-3940 Pe* 21 37 45.7673672486 -39 27 22.314122762   13.790 12.660 12.160 11.760 KIIvw 81 0
44 BPS CS 22956-0028 SB* 21 44 48.7079276715 -63 22 09.738970394   13.317 13.0     CEMP-s 23 0
45 C* 3312 Pe* 21 46 54.6641153460 -18 18 15.589209204   12.651 10.97 10.471 9.860 CEMP-s 10 0
46 HD 209621 Pe* 22 04 25.1407342403 +21 03 09.003434369   10.41 8.86     C-H3III: 98 0
47 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 410 0
48 HE 2312-0758 Pe* 23 14 54.3699840548 -07 42 33.222750573   15.12 14.11 14.06 13.25 CEMP-s 3 0

    Equat.    Gal    SGal    Ecl

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2020.07.06-21:45:50

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