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

Query : 2019A&A...621A.108A

2019A&A...621A.108A - Astronomy and Astrophysics, volume 621A108-108 (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 - 2026 		#notes
1 BPS CS 30324-0063 Pe* 00 22 44.8620794952 -17 24 29.140962984   13.824 12.887 12.665   CEMP-no 24 0
2 BPS CS 29527-0015 Pe* 00 29 10.6814565504 -19 10 07.305102624   14.61 14.24     CEMP-no 59 0
3 BPS CS 22166-0016 Pe* 00 58 23.8415767344 -14 47 06.878622912   13.34 12.75 12.324 11.898 CEMP-no 24 0
4 HE 0057-5959 Pe* 00 59 53.9857261680 -59 43 29.745171408   16.4       CEMP-no 39 0
5 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 250 0
6 SDSS J014036.21+234458.1 Pe* 01 40 36.2207485632 +23 44 58.206182748   15.6       CEMP-no 40 0
7 BPS CS 22958-0042 Pe* 02 01 07.4297976264 -57 16 58.850811840   14.037 14.52 14.222 13.902 CEMP-no 42 0
8 HE 0219-1739 Pe* 02 21 41.2958950176 -17 25 37.031081124   15.85 14.10 14.035 13.444 CEMP-no 10 0
9 BD+44 493 Pe* 02 26 49.7390353632 +44 57 46.523771136   9.63 9.11 9.073   CEMP-no 116 0
10 UCAC4 115-002803 Pe* 03 13 00.3747928560 -67 08 39.336144504   15.442 14.753 14.639   CEMP-no 122 0
11 G 77-61 Pe* 03 32 38.0920129269 +01 58 00.084645962   15.60 13.90 12.9   dC-J_CH5 139 0
12 HE 0405-0526 Pe* 04 07 47.2058598432 -05 18 11.859230484   11.413 10.715 10.615   CEMP-no 9 0
13 HE 0557-4840 Pe* 05 58 39.2660594064 -48 39 56.890252404   16.144 15.466 15.336   CEMP-no 92 0
14 SDSS J081554.26+472947.5 Pe* 08 15 54.2677752960 +47 29 47.601278124           F3/F5V 22 0
15 SDSS J092912.33+023817.0 Pe* 09 29 12.3277768296 +02 38 17.023376652           CEMP-s 15 0
16 2MASS J10081444+1605011 RB? 10 08 14.4415595736 +16 05 01.198034340           ~ 27 1
17 HE 1012-1540 Pe* 10 14 53.4753516864 -15 55 53.172437448   14.721 14.043 14.034   CEMP-no 43 0
18 HE 1133-0555 Pe* 11 36 11.7638171376 -06 11 43.119652740   16.063 15.427 15.030 14.639 CEMP-no 7 0
19 UCAC2 37720962 Pe* 11 49 03.3074623848 +16 58 41.334638376           CEMP-r/s 16 1
20 HE 1150-0428 Pe* 11 53 06.6090188016 -04 45 03.485197944   15.771 15.007 14.905   CEMP-no 31 0
21 BSD 56-46 Pe* 11 55 16.5604325976 +28 21 00.735046848   12.48 12.32 11.659 11.296 CEMP-s 16 0
22 HE 1201-1512 Pe* 12 03 37.0449862176 -15 29 33.236334924   14.2       CEMP-no 27 0
23 HE 1300+0157 Pe* 13 02 56.2443901392 +01 41 52.080457056   14.536 14.11 13.678 13.261 CEMP-no 48 0
24 BPS BS 16929-0005 Pe* 13 03 29.4751261824 +33 51 09.242978436 14.109 14.228 13.610 13.208 12.766 CEMP-no 41 0
25 HE 1300-0641 Pe* 13 03 34.1329557000 -06 57 20.869557192     14.804   13.929 CEMP-no 16 0
26 HE 1302-0954 Pe* 13 04 58.2130607664 -10 10 10.583620608   14.5       CEMP-no 7 0
27 HE 1305+0007 Pe* 13 08 03.8464604328 -00 08 47.502965400   13.98 12.223 11.541 11.071 CEMP-s 36 0
28 HE 1305+0132 Pe* 13 08 17.7580988112 +01 16 49.474585920   14.15 12.57 11.910 11.443 CEMP-s 27 0
29 2MASS J13132688-0019415 Pe* 13 13 26.8884339336 -00 19 41.336280264           CEMP-no 37 0
30 BPS CS 22877-0001 Pe* 13 13 55.3726775760 -12 11 41.666054388   12.78 12.38 11.695 11.218 CEMP-no 46 0
31 HE 1327-2326 Pe* 13 30 05.9394958608 -23 41 49.699340844 13.761 14.01 13.55 13.50 12.803 CEMP-no 258 0
32 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 299 0
33 LSPM J1341+4741 Pe* 13 41 44.6114760816 +47 41 28.905615168   11.86 11.44     ~ 10 0
34 Ross 841 Pe* 14 02 30.0900761861 -05 39 05.181979951   11.508 11.149 10.866 10.576 sdA3 161 0
35 HE 1410+0213 Pe* 14 13 06.5623389120 +01 59 21.911258400   14.29 13.25 12.734 12.297 CEMP-no 25 0
36 SDSS J142237.43+003105.2 Pe* 14 22 37.4316643608 +00 31 05.282518764           CEMP-no 17 0
37 BPS CS 30301-0015 Pe* 15 08 56.8432075560 +02 30 18.627466716   14.04 13.04   12.063 CEMP-s 47 0
38 HE 1506-0113 Pe* 15 09 14.2925716632 -01 24 56.730524328   15.4       CEMP-no 30 0
39 HD 135148 SB* 15 13 17.4566472168 +12 27 25.533915552   10.87 9.39 8.97   CEMP-s 100 0
40 SDSS J161313.51+530909.6 Pe* 16 13 13.5241043232 +53 09 09.693368640           CEMP-no 16 0
41 BPS CS 22878-0027 Pe* 16 37 35.8437123792 +10 22 07.754788668   14.86 14.4 14.45   CEMP-no 26 0
42 SMSS J173823.36-145701.0 Pe* 17 38 23.3594019264 -14 57 00.811318932           CEMP-no 9 0
43 SDSS J174624.12+245548.7 Pe* 17 46 24.1295713584 +24 55 48.764124012           CEMP-no 13 0
44 UCAC4 214-181275 HB* 19 18 31.6265761728 -47 13 31.155549384   13.656 12.962 12.859 12.085 CEMP-s 44 0
45 HE 2002-5843 Pe* 20 07 03.7915948392 -58 34 57.592948836   13.72 13.03   12.102 CEMP-no 30 0
46 BPS CS 29498-0043 Pe* 21 03 52.1197651440 -29 42 50.344181712   14.8 13.72 13.013 12.406 CEMP-no 100 0
47 HE 2123-0329 Pe* 21 26 08.9581508400 -03 16 58.787281596   14.089 13.650 13.026   CEMP-no 12 0
48 HE 2139-5432 Pe* 21 42 42.4478261040 -54 18 42.968447028   15.9       CEMP-no 36 0
49 HE 2142-5656 Pe* 21 46 20.3571940823 -56 42 19.072145199   14.729 13.971 13.940   CEMP-no 14 0
50 HE 2155-3750 Pe* 21 58 09.7391652941 -37 36 19.269981780   14.274 13.272 13.207   CEMP-s 5 0
51 HE 2202-4831 Pe* 22 06 05.8503575668 -48 16 52.995877021   16.3   15.342   CEMP-no 15 0
52 SDSS J220646.20-092545.7 Pe* 22 06 46.2048718296 -09 25 45.747895296           F5 12 0
53 BPS CS 29502-0092 Pe* 22 22 35.9982138384 -01 38 27.620508552   12.64 11.87 11.365 10.862 CEMP-no 67 0
54 2MASS J22511940-7344236 Pe* 22 51 19.4227037972 -73 44 23.703501022   14.4       CEMP-no 16 0
55 CD-24 17504 Pe* 23 07 20.2534619736 -23 52 35.954286096   12.51 12.18     CEMP-no 94 0
56 HE 2318-1621 Pe* 23 21 21.5631300312 -16 05 05.628387156   13.38 12.73 12.67   CEMP-no 19 0
57 2MASS J23215820-5211431 Pe* 23 21 58.1901363600 -52 11 43.204631172   14.3       CEMP-no 13 0
58 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.125 14.321 14.289 13.358 CEMP-no 184 0
59 HE 2356-0410 Pe* 23 59 13.1419841280 -03 53 48.220213560   14.39 13.60 13.164 12.713 CEMP-no 88 0

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