2013ApJ...762...27Y

Query : 2013ApJ...762...27Y

2013ApJ...762...27Y - Astrophys. J., 762, 27 (2013/January-1)

The most metal-poor stars. III. The metallicity distribution function and carbon-enhanced metal-poor fraction.

YONG D., NORRIS J.E., BESSELL M.S., CHRISTLIEB N., ASPLUND M., BEERS T.C., BARKLEM P.S., FREBEL A. and RYAN S.G.

Abstract (from CDS):

We examine the metallicity distribution function (MDF) and fraction of carbon-enhanced metal-poor (CEMP) stars in a sample that includes 86 stars with [Fe/H] ≤ -3.0, based on high-resolution, high signal-to-noise spectroscopy, of which some 32 objects lie below [Fe/H] = -3.5. After accounting for the completeness function, the "corrected" MDF does not exhibit the sudden drop at [Fe/H] = -3.6 that was found in recent samples of dwarfs and giants from the Hamburg/ESO survey. Rather, the MDF decreases smoothly down to [Fe/H] = -4.1. Similar results are obtained from the "raw" MDF. We find that the fraction of CEMP objects below [Fe/H] = -3.0 is 23%±6% and 32%±8% when adopting the Beers & Christlieb and Aoki et al. CEMP definitions, respectively. The former value is in fair agreement with some previous measurements, which adopt the Beers & Christlieb criterion.

Abstract Copyright: ∼

Journal keyword(s): early universe - Galaxy: formation - Galaxy: halo - nuclear reactions, nucleosynthesis, abundances - stars: abundances

VizieR on-line data: <Available at CDS (J/ApJ/762/27): table1.dat>

Simbad objects: 88

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Number of rows : 88
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 29527-0015 Pe* 00 29 10.6814565504 -19 10 07.305102624   14.61 14.24     CEMP-no 59 0
2 HE 0027-3613 Pe* 00 30 15.9610744584 -35 56 51.229784760     14.74     ~ 32 0
3 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.332 12.184 12.072 11.321 CEMP-s 92 0
4 HD 4306 SB* 00 45 27.1616035344 -09 32 39.785396712 9.80 9.75 9.02 8.75   G3/5w(A) 168 0
5 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 233 0
6 HE 0049-3948 Pe* 00 52 13.3521011016 -39 32 36.982865436   15.70       ~ 15 0
7 HE 0057-5959 Pe* 00 59 53.9857261680 -59 43 29.745171408   16.4       CEMP-no 39 0
8 HE 0102-1213 Pe* 01 05 27.9559083504 -11 57 30.967736472   14.016 13.574 13.511   CEMP-no 30 0
9 BPS CS 22183-0031 Pe* 01 09 05.0900915136 -04 43 21.343580436   14.24 13.62 13.178 12.724 ~ 52 0
10 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 250 0
11 2MASS J01183829-3041026 Pe* 01 18 38.3021768400 -30 41 02.851310832 14.730 14.94 14.6     ~ 27 0
12 HE 0130-2303 Pe* 01 33 18.2202884064 -22 48 36.713991600 14.933 15.175 14.743 14.798 14.207 ~ 11 0
13 HE 0132-2439 Pe* 01 34 58.8596333280 -24 24 18.618548508 15.324 15.441 14.82 14.396 13.954 CEMP-no 23 0
14 SDSS J014036.21+234458.1 Pe* 01 40 36.2207485632 +23 44 58.206182748   15.6       CEMP-no 40 0
15 HE 0146-1548 Pe* 01 48 34.7215994472 -15 33 24.492104712   16.406 15.725 15.193 14.658 CEMP-no 22 0
16 HE 0148-2611 Pe* 01 50 59.6229706560 -25 57 03.082337424 14.574 14.824 14.460 14.520   ~ 14 0
17 HE 0218-2738 Pe* 02 21 03.9311324592 -27 24 40.401469764 15.037 15.277 14.870 15.021   ~ 17 0
18 HE 0228-4047 * 02 30 33.6 -40 33 56   15.5       ~ 11 0
19 HE 0231-6025 Pe* 02 32 30.5633335824 -60 12 11.124457812   14.70 14.30 14.15   ~ 7 0
20 HE 0239-1340 Pe* 02 41 42.3721546152 -13 28 10.603797240   14.73 13.97 13.566 13.080 CEMP-no 64 0
21 HE 0242-0732 Pe* 02 45 00.6905166888 -07 19 42.358303632 15.956 16.227 15.840 15.701   ~ 11 0
22 HE 0253-1331 Pe* 02 56 06.6679681200 -13 19 27.014501712   15.94 15.50 15.57   ~ 7 0
23 BPS CS 22963-0004 Pe* 02 56 46.5715607688 -04 51 17.421404184   15.51 14.98     ~ 30 0
24 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 79 0
25 2MASS J03142084-1035112 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 73 0
26 HE 0355-3728 * 03 57 23.0 -37 20 23   16.3       ~ 6 0
27 BPS CS 22186-0025 Pe* 04 24 32.7982834272 -37 09 02.518136460   14.99 14.24 13.740 13.269 ~ 40 0
28 HE 0557-4840 Pe* 05 58 39.2660594064 -48 39 56.890252404   16.144 15.466 15.336   CEMP-no 92 0
29 HE 0945-1435 Pe* 09 47 50.6778824184 -14 49 06.861774900   15.73 15.23 15.35   CEMP-mp 14 0
30 2MASS J10075239-1454209 Pe* 10 07 52.3942405200 -14 54 20.983216896   14.440 13.524 13.054 12.515 CEMP-s 27 0
31 HE 1012-1540 Pe* 10 14 53.4753516864 -15 55 53.172437448   14.721 14.043 14.034   CEMP-no 43 0
32 2MASS J10151018+4253173 Pe* 10 15 10.1903157288 +42 53 17.362408452   14.19 13.42 12.950 12.470 ~ 19 0
33 UCAC3 215-112497 Pe* 10 29 15.1489854864 +17 29 27.924626724   17.424 16.708   15.98 sdA 120 0
34 HE 1116-0054 * 11 18 47.8 -01 11 20   16.5       ~ 8 0
35 BPS BS 16545-0089 Pe* 11 24 27.5182636872 +36 50 28.816337760   14.76 14.44 14.039 13.812 ~ 24 0
36 2MASS J11281356+3841488 Pe* 11 28 13.5743660784 +38 41 48.962177232   15.8       sdA 13 0
37 HE 1150-0428 Pe* 11 53 06.6090188016 -04 45 03.485197944   15.771 15.007 14.905   CEMP-no 31 0
38 HE 1201-1512 Pe* 12 03 37.0449862176 -15 29 33.236334924   14.2       CEMP-no 27 0
39 BPS BS 16920-0017 Pe* 12 07 16.8335931408 +41 39 32.430850740   14.69 13.93 13.368 12.877 ~ 20 0
40 BPS BS 16085-0050 Pe* 12 37 46.6781374776 +19 22 49.551755664 12.965 12.93 12.16 11.668 11.186 ~ 32 0
41 2MASS J12482275+2056440 Pe* 12 48 22.7519584056 +20 56 44.029766004   13.88 13.4 13.115 12.706 ~ 25 0
42 HE 1300+0157 Pe* 13 02 56.2443901392 +01 41 52.080457056   14.536 14.11 13.678 13.261 CEMP-no 48 0
43 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
44 HE 1320-2952 Pe* 13 22 55.1110754064 -30 08 07.257097500   15.18 14.40 14.93   ~ 16 0
45 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
46 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 53 0
47 HE 1346-0427 Pe* 13 49 25.0682496912 -04 42 14.725345572   14.356 14.20 13.807 13.433 ~ 22 0
48 HE 1347-1025 Pe* 13 50 22.3970330568 -10 40 18.942310344   15.727 15.013     ~ 15 0
49 HE 1356-0622 Pe* 13 59 30.3168806616 -06 36 34.904583792   14.995 14.268 14.313   ~ 16 0
50 HE 1402-0523 Pe* 14 04 37.9575382680 -05 38 13.673864292   15.8       ~ 9 0
51 BPS BS 16550-0087 Pe* 14 10 26.7272915496 +18 01 23.732433480   14.59 13.76 13.211 12.688 ~ 28 0
52 HE 1424-0241 Pe* 14 26 40.3306297920 -02 54 27.487168164   15.892 15.45 14.887 14.54 ~ 40 0
53 HD 126587 Pe* 14 27 00.3636631296 -22 14 38.992940592   9.88 9.60 8.75   CEMP-no 145 0
54 2MASS J14325691+0646069 Pe* 14 32 56.9231765928 +06 46 06.974256288   14.94 14.22 13.727 13.224 ~ 37 0
55 2MASS J14543927+0421380 Pe* 14 54 39.2685981792 +04 21 38.099145888   13.02 12.32 11.849 11.376 ~ 53 0
56 HE 1506-0113 Pe* 15 09 14.2925716632 -01 24 56.730524328   15.4       CEMP-no 30 0
57 BPS CS 30312-0059 Pe* 15 34 48.8386814136 -01 23 37.343777064   13.85 13.14 12.596 12.065 ~ 29 0
58 BPS CS 22884-0108 Pe* 15 49 57.5787151824 -09 14 09.211901388   14.74 14.24     ~ 27 0
59 BPS BS 16084-0160 Pe* 16 28 50.7923247984 +54 37 06.886218324   13.94 13.12 12.630 12.103 ~ 22 0
60 BPS CS 22878-0101 Pe* 16 45 31.4513454168 +08 14 45.470265900   14.601   13.603 12.673 KIIvw 62 0
61 BPS BS 16080-0093 Pe* 16 50 38.3051346312 +59 13 06.553935984   14.30 13.6     ~ 14 0
62 BPS CS 22891-0209 Pe* 19 42 02.1802427088 -61 03 44.534898612   13.03 12.18     KIIvw 64 0
63 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 185 0
64 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 96 0
65 BPS CS 22950-0046 Pe* 20 21 28.3975657104 -13 16 33.601931364   15.13 14.224 13.639 13.066 CEMP-no 43 0
66 HE 2032-5633 * 20 36 24.9 -56 23 05   15.2       ~ 11 0
67 2MASS J20452353-2842359 Pe* 20 45 23.5333400256 -28 42 35.912310048   14.89 14.03 13.328 12.844 ~ 37 0
68 BPS CS 22880-0086 Pe* 20 45 47.5279506312 -18 33 32.356128240   15.08 14.32 14.36   ~ 21 0
69 HE 2047-5612 Pe* 20 51 22.1323618608 -56 00 52.956443880   15.5       ~ 11 0
70 BPS CS 22897-0008 Pe* 21 03 11.8565397504 -65 05 08.852220600   14.02 13.33     CEMP-no 80 0
71 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
72 HE 2135-1924 Pe* 21 38 04.7396474400 -19 11 04.391572128   15.7       ~ 9 0
73 HE 2139-5432 Pe* 21 42 42.4478261040 -54 18 42.968447028   15.9       CEMP-no 36 0
74 HE 2141-3741 RG* 21 44 51.1647807408 -37 27 55.017356112   14.10 13.47     CEMP-no 60 0
75 BPS CS 22948-0093 Pe* 21 50 31.5180047928 -41 07 49.355148468   15.54 15.18     ~ 37 0
76 BPS CS 22956-0050 Pe* 21 58 05.8340681280 -65 13 27.160682772   14.95 14.25 13.745 13.211 CEMP-no 42 0
77 BPS CS 22965-0054 Pe* 22 06 30.2933030688 -02 32 34.433318220   15.69 15.07 14.732 14.072 CEMP-no 39 0
78 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
79 2MASS J22214882+0228448 Pe* 22 21 48.8262598080 +02 28 44.867730936 13.291 13.4 12.74 12.325 12.013 ~ 46 0
80 2MASS J22261535+0251462 Pe* 22 26 15.3575269416 +02 51 46.326341232   14.43 13.57 13.011 12.416 F2 39 0
81 BPS CS 29491-0053 Pe* 22 36 56.2965716592 -28 31 06.577096368   13.76 12.92 12.380 11.812 ~ 36 0
82 CD-24 17504 Pe* 23 07 20.2534619736 -23 52 35.954286096   12.51 12.18     CEMP-no 94 0
83 BPS CS 22888-0031 Pe* 23 11 32.4788498208 -35 26 42.872735796   15.31 14.90     CEMP-no 39 0
84 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.125 14.321 14.289 13.358 CEMP-no 184 0
85 2MASS J23350705-3022543 Pe* 23 35 07.0484945928 -30 22 54.278132700 14.694 14.97 14.6     ~ 32 0
86 HE 2334-0604 RG* 23 37 28.6873103640 -05 47 56.594641632   14.03 13.28 12.768 12.249 KIIvw 74 0
87 HE 2356-0410 Pe* 23 59 13.1419841280 -03 53 48.220213560   14.39 13.60 13.164 12.713 CEMP-no 88 0
88 NAME Local Group GrG ~ ~           ~ 9325 0

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