2019A&A...621A.108A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:02:08

2019A&A...621A.108A - Astronomy and Astrophysics, volume 621A, 108-108 (2019/1-1)

Binarity among CEMP-no stars: an indication of multiple formation pathways?

ARENTSEN A., STARKENBURG E., SHETRONE M.D., VENN K.A., DEPAGNE E. and McCONNACHIE A.W.

Abstract (from CDS):

Carbon-enhanced metal-poor (CEMP) stars comprise a high percentage of stars at the lowest metallicities. The stars in the CEMP-no subcategory do not show any s-process enhancement and therefore cannot easily be explained by transfer of carbon and s-process elements from a binary AGB companion. We have performed radial velocity monitoring of a sample of 22 CEMP-no stars to further study the role that binarity plays in this type of CEMP star. We find four new binary CEMP-no stars based on their radial velocity variations; this significantly enlarges the population of known binaries to a total of 11. One of the new stars found to be in a binary system is HE 0107-5240, which is one of the most iron-poor stars known. This supports the binary transfer model for the origin of the abundance pattern of this star. We find a difference in binary fraction in our sample that depends on the absolute carbon abundance, with a binary fraction of 47+15–14% for stars with a higher absolute carbon abundance and 18+14–9% for stars with a lower absolute carbon abundance. This might imply a relation between a high carbon abundance and the binarity of a metal-poor star. Although binarity does not equate to mass transfer, there is a possibility that a CEMP-no star in a binary system has been polluted, and care has to be taken in the interpretation of their abundance patterns. We furthermore demonstrate the potential of Gaia of discovering additional binary candidates.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: chemically peculiar - binaries: spectroscopic - stars: AGB and post-AGB - Galaxy: halo - galaxies: formation

VizieR on-line data: <Available at CDS (J/A+A/621/A108): tableb1.dat tableb2.dat>

Simbad objects: 59

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Number of rows : 59

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 BPS CS 30324-0063 Pe* 00 22 44.8620944430 -17 24 29.142325967   13.824 12.887     CEMP-no 13 0
2 BPS CS 29527-0015 Pe* 00 29 10.6813715074 -19 10 07.306464364   14.61 14.24     CEMP-no 53 0
3 BPS CS 22166-0016 Pe* 00 58 23.8414780886 -14 47 06.881569381   13.34 12.75 12.324 11.898 CEMP-no 19 0
4 HE 0057-5959 Pe* 00 59 53.9858308128 -59 43 29.745940196   16.4       CEMP-no 29 0
5 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 229 0
6 SDSS J014036.21+234458.1 Pe* 01 40 36.2206962306 +23 44 58.204189219   15.6       CEMP-no 32 0
7 BPS CS 22958-0042 Pe* 02 01 07.4296353198 -57 16 58.851945318   14.037 14.52 14.222 13.902 CEMP-no 35 0
8 HE 0219-1739 Pe* 02 21 41.2959105494 -17 25 37.032701370   15.85 14.10 14.035 13.444 CEMP-no 9 0
9 BD+44 493 Pe* 02 26 49.7388403813 +44 57 46.526253277   9.63 9.11     CEMP-no 85 0
10 SMSS J031300.36-670839.3 Pe* 03 13 00.3747490864 -67 08 39.336567558           CEMP-no 86 0
11 G 77-61 Pe* 03 32 38.0871477505 +01 58 00.010460312   15.60 13.90 12.9   dC-J_CH5 125 0
12 HE 0405-0526 Pe* 04 07 46.99800 -05 18 10.9863           CEMP-no 4 0
13 HE 0557-4840 Pe* 05 58 39.2661082631 -48 39 56.890701762   16.16 15.45 14.991   CEMP-no 81 0
14 SDSS J081554.26+472947.5 Pe* 08 15 54.2676180215 +47 29 47.601533053           F3/F5V 11 0
15 SDSS J092912.33+023817.0 Pe* 09 29 12.3278971448 +02 38 17.021720615           CEMP-s 9 0
16 SDSS J100814.44+160501.1 RB? 10 08 14.4416905347 +16 05 01.188764402           ~ 21 1
17 HE 1012-1540 Pe* 10 14 53.4754858508 -15 55 53.171904692     14.04     CEMP-no 32 0
18 HE 1133-0555 Pe* 11 36 11.7636415660 -06 11 43.119640336   16.063 15.427 15.030 14.639 CEMP-no 6 0
19 NAME HKII 17435-00532 Pe* 11 49 03.3075588940 +16 58 41.335528859           CEMP-r/s 15 1
20 HE 1150-0428 Pe* 11 53 06.6089448606 -04 45 03.484251112     14.91     CEMP-no 27 0
21 TYC 1987-753-1 PM* 11 55 16.5602361723 +28 21 00.738079604   12.48 12.32 11.659 11.296 CEMP-s 8 0
22 HE 1201-1512 Pe* 12 03 37.0450878463 -15 29 33.235237621   14.2       CEMP-no 17 0
23 HE 1300+0157 Pe* 13 02 56.2444113387 +01 41 52.080881619   14.536 14.11 13.678 13.261 CEMP-no 40 0
24 BPS BS 16929-0005 Pe* 13 03 29.4750923367 +33 51 09.243677482 14.109 14.228 13.610 13.208 12.766 CEMP-no 34 0
25 HE 1300-0641 Pe* 13 03 34.1329709575 -06 57 20.869199156     14.804   13.929 CEMP-no 15 0
26 HE 1302-0954 Pe* 13 04 58.2130874769 -10 10 10.583993517   14.5       CEMP-no 6 0
27 HE 1305+0007 Pe* 13 08 03.8464221670 -00 08 47.501674274   13.98 12.223 11.541 11.071 CEMP-s 27 0
28 HE 1305+0132 Pe* 13 08 17.7580021762 +01 16 49.476922375   14.15 12.57 11.910 11.443 CEMP-s 24 0
29 2MASS J13132688-0019415 Pe* 13 13 26.8883961320 -00 19 41.335927067           CEMP-no 25 0
30 BPS CS 22877-0001 Pe* 13 13 55.3726645896 -12 11 41.664182839   12.78 12.38 11.695 11.218 CEMP-no 35 0
31 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 217 0
32 Wolf 1492 Pe* 13 40 02.4921790616 -00 02 18.750321114 11.601 11.832 11.451 11.184 10.892 sdF0: 263 0
33 TYC 3466-1150-1 Pe* 13 41 44.6114507683 +47 41 28.905852402   11.86 11.44     ~ 7 0
34 Ross 841 Pe* 14 02 30.0901582051 -05 39 05.181328144   11.508 11.149 10.866 10.576 sdA3 140 0
35 HE 1410+0213 Pe* 14 13 06.5623968167 +01 59 21.912907907   14.29 13.25 12.734 12.297 CEMP-no 22 0
36 SDSS J142237.43+003105.2 Pe* 14 22 37.4318082092 +00 31 05.279166190           CEMP-no 13 0
37 BPS CS 30301-0015 Pe* 15 08 56.8433023195 +02 30 18.628172611   14.04 13.04   12.063 CEMP-s 44 0
38 HE 1506-0113 Pe* 15 09 14.2926751829 -01 24 56.730409770   15.4       CEMP-no 22 0
39 HD 135148 SB* 15 13 17.4566658985 +12 27 25.536244668   10.87 9.39 8.97   CEMP-s 87 0
40 SDSS J161313.51+530909.6 Pe* 16 13 13.5242126209 +53 09 09.692768808           CEMP-no 13 0
41 BPS CS 22878-0027 Pe* 16 37 35.8437255100 +10 22 07.754675906   14.86 14.35 14.45   CEMP-no 23 0
42 SMSS J173823.36-145701.0 Pe* 17 38 23.3593718074 -14 57 00.811797981           CEMP-no 6 0
43 SDSS J174624.12+245548.7 Pe* 17 46 24.1296369515 +24 55 48.761700776           CEMP-no 10 0
44 BPS CS 22947-0187 HB* 19 18 31.6263239095 -47 13 31.155732437   13.63 12.99 12.508 12.085 CEMP-s 35 0
45 HE 2002-5843 Pe* 20 07 03.7913579678 -58 34 57.595488533   13.72 13.03   12.102 CEMP-no 25 0
46 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 88 0
47 HE 2123-0329 Pe* 21 26 08.9580474820 -03 16 58.787103240   14.6       CEMP-no 7 0
48 HE 2139-5432 Pe* 21 42 42.4475156604 -54 18 42.968678598   15.9       CEMP-no 27 0
49 HE 2142-5656 Pe* 21 46 20.50080 -56 42 18.0080   14.4       CEMP-no 11 0
50 UCAC4 262-193743 Pe* 21 58 09.79810 -37 36 20.0303     13.32     CEMP-s 4 0
51 HE 2202-4831 Pe* 22 06 06.00020 -48 16 53.0089   16.3       CEMP-no 12 0
52 SDSS J220646.20-092545.7 Pe* 22 06 46.2046247583 -09 25 45.748775639           ~ 11 0
53 BPS CS 29502-0092 Pe* 22 22 35.9981441327 -01 38 27.624102360   12.64 11.87 11.365 10.862 CEMP-no 45 0
54 HE 2247-7400 Pe* 22 51 19.60360 -73 44 21.0051   14.4       CEMP-no 11 0
55 CD-24 17504 Pe* 23 07 20.2536159873 -23 52 35.956455668   12.51 12.18     CEMP-no 82 0
56 HE 2318-1621 Pe* 23 21 21.5631896741 -16 05 05.631099048   13.38 12.73 12.67   CEMP-no 10 0
57 HE 2319-5228 Pe* 23 21 58.1900074724 -52 11 43.205626882   14.3       CEMP-no 8 0
58 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 172 0
59 HE 2356-0410 Pe* 23 59 13.1417869434 -03 53 48.220053208   14.39 13.60 13.164 12.713 CEMP-no 82 0

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2020.10.29-22:02:08

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