2018ApJ...856..142C

Query : 2018ApJ...856..142C

2018ApJ...856..142C - Astrophys. J., 856, 142-142 (2018/April-1)

Detection of a population of carbon-enhanced metal-poor stars in the Sculptor dwarf spheroidal galaxy.

CHITI A., SIMON J.D., FREBEL A., THOMPSON I.B., SHECTMAN S.A., MATEO M., BAILEY J.I., CRANE J.D. and WALKER M.

Abstract (from CDS):

The study of the chemical abundances of metal-poor stars in dwarf galaxies provides a venue to constrain paradigms of chemical enrichment and galaxy formation. Here we present metallicity and carbon abundance measurements of 100 stars in Sculptor from medium-resolution (R ∼ 2000) spectra taken with the Magellan/Michigan Fiber System mounted on the Magellan-Clay 6.5 m telescope at Las Campanas Observatory. We identify 24 extremely metal-poor star candidates ([Fe/H] < -3.0) and 21 carbon-enhanced metal-poor (CEMP) star candidates. Eight carbon-enhanced stars are classified with at least 2σ confidence, and five are confirmed as such with follow-up R ∼ 6000 observations using the Magellan Echellette Spectrograph on the Magellan-Baade 6.5 m telescope. We measure a CEMP fraction of 36% for stars below [Fe/H] = -3.0, indicating that the prevalence of carbon-enhanced stars in Sculptor is similar to that of the halo (∼43%) after excluding likely CEMP-s and CEMP-r/s stars from our sample. However, we do not detect that any CEMP stars are strongly enhanced in carbon ([C/Fe] > 1.0). The existence of a large number of CEMP stars both in the halo and in Sculptor suggests that some halo CEMP stars may have originated from accreted early analogs of dwarf galaxies.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: individual: Sculptor dSph - galaxies: stellar content - stars: abundances - stars: carbon

VizieR on-line data: <Available at CDS (J/ApJ/856/142): table5.dat table6.dat>

Nomenclature: Tables 5-6: [CSF2018] FF-N-NNNN N=26+100.

Simbad objects: 119

goto Full paper

goto View the references in ADS

Number of rows : 119
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 SKB 2 Pe* 00 41 39.8197621944 -26 18 54.460585116   13.332 12.184 12.072 11.321 CEMP-s 92 0
2 [CSF2018] 7-4-3280 Pe* 00 58 37.1129105688 -33 34 08.430004848           ~ 1 0
3 2MASS J00583880-3335025 Ev* 00 58 38.8071619536 -33 35 02.542403148     17.8   16.5 ~ 8 0
4 2MASS J00583966-3355347 Ev* 00 58 39.6638046600 -33 55 34.764214152           ~ 6 0
5 [CSF2018] 7-4-3182 Ev* 00 58 49.8145020912 -33 37 19.227939888     19.31   18.21 ~ 4 0
6 2MASS J00585788-3341504 Pe* 00 58 57.8816741568 -33 41 50.396422236     19.03   17.87 ~ 3 0
7 [V78] 251 Pe* 00 59 00.1403380920 -33 38 51.000166824     18.86   17.66 CEMP-s 5 0
8 2MASS J00590028-3343147 Ev* 00 59 00.2797854960 -33 43 14.676324348     18.1   16.83 ~ 9 0
9 2MASS J00590406-3340317 Ev* 00 59 04.0540401192 -33 40 31.507072212     18.17   16.91 ~ 9 0
10 [CSF2018] 11-1-6192 Pe* 00 59 06.1391307000 -33 44 11.404531104     19.11   17.93 ~ 3 0
11 [CSF2018] 11-1-6015 Ev* 00 59 10.2553451328 -33 45 53.372390220     19.29   18.25 ~ 5 0
12 [CSF2018] 7-4-2750 Ev* 00 59 17.2043058720 -33 38 06.669015648           ~ 3 0
13 [CSF2018] 11-1-5437 Ev* 00 59 19.8857771448 -33 38 56.711296428           CEMP-s 3 0
14 2MASS J00592563-3358214 Ev* 00 59 25.6403482728 -33 58 21.502134804           ~ 7 0
15 [CSF2018] 11-1-5047 Ev* 00 59 26.6881576824 -33 40 22.379082384     19.22   18.08 ~ 4 0
16 2MASS J00593045-3336050 RG* 00 59 30.4429475592 -33 36 05.177031912     17.947   16.732 ~ 21 0
17 2MASS J00593048-3339041 RG* 00 59 30.4985299992 -33 39 04.087610208     17.981   16.967 ~ 16 0
18 2MASS J00593363-3349101 Pe* 00 59 33.6492518856 -33 49 10.146153288     18.26   17.03 ~ 3 0
19 [CSF2018] 11-1-4422 Ev* 00 59 36.6225678984 -33 40 38.452788624           ~ 4 0
20 [CSF2018] 11-2-556 Ev* 00 59 37.9236435312 -33 55 26.676566616           ~ 2 0
21 [CSF2018] 11-1-4277 Ev* 00 59 38.4318660936 -33 40 11.530788600     19.31   18.26 ~ 4 0
22 [CSF2018] 11-1-4296 Pe* 00 59 38.7626222568 -33 46 14.631963456     19.16   18.04 ~ 10 0
23 2MASS J00594106-3345252 Ev* 00 59 41.0618659656 -33 45 25.305298164         17.36 CEMP-s 3 0
24 [CSF2018] 11-1-4122 Ev* 00 59 41.2570873968 -33 48 03.603714660           ~ 3 0
25 [CSF2018] 7-4-1992 Ev* 00 59 42.3134237976 -33 35 47.252590368     19.52   18.43 ~ 4 0
26 2MASS J00594529-3343540 RG* 00 59 45.3196054656 -33 43 53.844320496   19.01 17.913   16.689 ~ 16 0
27 [CSF2018] 11-1-3743 Pe* 00 59 45.3876638917 -33 45 34.254750276     19.5   18.41 ~ 3 0
28 [CSF2018] 11-1-3646 RG* 00 59 46.6845374880 -33 47 19.787494128     19.576   18.566 ~ 7 0
29 SCMS 1385 Ev* 00 59 48.2038668720 -33 46 50.045945844   20.57 19.89     ~ 3 0
30 SCMS 280 Pe* 00 59 49.6309318728 -33 40 41.759481432   20.07 18.97   17.87 CEMP-s 5 0
31 [CSF2018] 11-2-425 Ev* 00 59 50.6608708464 -33 58 07.160312280     19.09   17.99 ~ 3 0
32 2MASS J00595077-3331472 RG* 00 59 50.7907567584 -33 31 47.227464012     17.982   16.871 ~ 13 0
33 2MASS J00595120-3344517 Ev* 00 59 51.2049001248 -33 44 51.851022000   19.12 18.01     ~ 4 0
34 2MASS J00595152-3344018 RG* 00 59 51.5333375232 -33 44 02.712457752   19.29 18.414   17.314 ~ 9 0
35 SCMS 229 Pe* 00 59 51.5775471024 -33 45 07.781469588   19.13 18.69     ~ 2 0
36 2MASS J00595448-3337533 RG* 00 59 54.4771909632 -33 37 53.476829832   18.76 17.770   16.608 ~ 17 0
37 2MASS J00595519-3342108 Pe* 00 59 55.2322877208 -33 42 11.398756248   19.27 18.5   17.33 ~ 4 0
38 SCMS 204 Pe* 00 59 55.5042842297 -33 45 51.685603032   19.57 19.20     ~ 2 0
39 2MASS J00595618-3343047 Ev* 00 59 56.1813940128 -33 43 04.898806536   20.06 18.76     CEMP-s 4 0
40 SCMS 306 Ev* 00 59 56.7478777248 -33 39 37.580791464   20.61 19.52     CEMP-s 4 0
41 2MASS J00595762-3338325 RG* 00 59 57.6067016688 -33 38 32.487799092   19.08 17.940   16.677 ~ 16 0
42 SCMS 610 Pe* 00 59 58.6454345064 -33 43 29.121248136   19.64 19.21     ~ 2 0
43 [CSF2018] 10-8-3804 Ev* 00 59 58.9261646304 -33 50 53.523976272           CEMP-s 3 0
44 2MASS J00595910-3336449 RG* 00 59 59.1011469144 -33 36 44.930017116   18.92 17.760   16.644 ~ 9 0
45 SCMS 595 Ev* 00 59 59.3470320960 -33 44 24.335764296   20.13 19.54   18.44 ~ 4 0
46 EV* SclG V0310 V* 00 59 59.9320119312 -33 51 11.581496532           ~ 2 0
47 SCMS 187 Ev* 00 59 59.9781103704 -33 47 02.028689232   20.38 19.62     ~ 3 0
48 2MASS J01000005-3345287 RG* 01 00 00.0485730336 -33 45 28.843230708   19.28 18.328   17.277 ~ 10 0
49 [CSF2018] 6-6-402 Ev* 01 00 00.4077384576 -33 29 15.452889144           ~ 8 0
50 [V78] 551 Ev* 01 00 01.1459036832 -33 59 21.358222944           ~ 13 0
51 2MASS J01000146-3351167 RG* 01 00 01.4579100720 -33 51 16.639686288     17.716   16.595 ~ 14 0
52 SCMS 1333 Pe* 01 00 02.6574923208 -33 49 18.694107732   20.01 19.53     ~ 2 0
53 SCMS 171 Pe* 01 00 03.2820291792 -33 47 44.439506052   19.49 18.75   17.56 ~ 4 0
54 2MASS J01000594-3345564 RG* 01 00 05.9357621616 -33 45 56.440573956   19.02 17.964   16.715 ~ 16 0
55 SCMS 1319 Pe* 01 00 07.6716052656 -33 49 46.993202400   19.71 19.27     ~ 2 0
56 SCMS 163 Ev* 01 00 07.8678472656 -33 47 07.655612172   20.26 19.64     ~ 3 0
57 EV* SclG V0524 Ev* 01 00 08.8678548696 -33 49 49.647830664     19.66     ~ 4 0
58 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
59 SCMS 158 Ev* 01 00 09.7274331648 -33 47 00.835573596   19.6 19.13     ~ 3 0
60 SCMS 934 Pe* 01 00 11.2007028840 -33 40 38.633615508   19.91 19.44   18.38 ~ 3 0
61 2MASS J01001133-3339355 RG* 01 00 11.3080468104 -33 39 35.665324920   19.13 18.055   16.992 ~ 9 0
62 2MASS J01001174-3344503 RG* 01 00 11.7319642224 -33 44 50.369156700   18.84 17.809   16.58 ~ 17 0
63 [CSF2018] 10-7-790 Ev* 01 00 12.6498964944 -33 53 09.396355308     18.26   17.03 ~ 4 0
64 SCMS 712 Ev* 01 00 12.7824591384 -33 38 53.574654408   19.85 19.19   18.04 ~ 4 0
65 2MASS J01001295-3342038 RG* 01 00 12.9546658464 -33 42 03.847742604   18.96 18.029   16.84 ~ 16 0
66 SCMS 1024 Ev* 01 00 13.4411762400 -33 43 20.812900404   19.94 19.222   18.282 ~ 9 0
67 2MASS J01001452-3347501 RG* 01 00 14.4998771448 -33 47 50.544429900   18.85 17.936   16.877 ~ 10 0
68 [CSF2018] 10-8-2714 Pe* 01 00 14.7448810584 -33 51 18.197778636           ~ 1 0
69 SCMS 528 Pe* 01 00 15.2626153680 -33 45 49.908879540   19.61 18.95   17.9 ~ 4 0
70 SCMS 526 Pe* 01 00 15.6769704576 -33 46 00.010639020   20.5 19.79     ~ 2 0
71 SCMS 823 Ev* 01 00 15.8776711896 -33 45 01.929443400   19.52 18.78     ~ 4 0
72 SCMS 985 RG* 01 00 17.0382842136 -33 42 47.261587860   19.59 18.800   17.844 ~ 8 0
73 2MASS J01001936-3337116 RG* 01 00 19.3444921944 -33 37 11.804366064   19.19 18.231   17.183 ~ 9 0
74 SCMS 385 RG* 01 00 22.3775214624 -33 38 07.821913416   19.98 19.203   18.225 ~ 8 0
75 2MASS J01002275-3351227 Ev* 01 00 22.7426066712 -33 51 22.808183184     18.04   16.79 ~ 5 0
76 SCMS 766 Ev* 01 00 23.5019891928 -33 41 46.172726952   20.34 19.79     ~ 3 0
77 SCMS 753 Ev* 01 00 23.7190041528 -33 40 20.361523296   20.66 19.75     CEMP-s 3 0
78 SCMS 501 Ev* 01 00 24.0784482504 -33 45 54.462933252   20.29 19.15     ~ 4 0
79 SCMS 1278 Ev* 01 00 25.9533358320 -33 48 40.719094992   20.48 19.8   18.69 ~ 4 0
80 2MASS J01002843-3347416 RG* 01 00 28.4345353248 -33 47 41.575519536   19.19 18.116   17.046 ~ 10 0
81 [CSF2018] 10-8-1877 Ev* 01 00 28.6331081016 -33 46 02.706518928     19.76   18.61 ~ 3 0
82 [CSF2018] 10-8-1731 Pe* 01 00 31.0070003664 -33 47 12.261689340     19.48   18.46 ~ 2 0
83 2MASS J01003185-3338000 RG* 01 00 31.8779478312 -33 38 00.279539412   19.11 18.101   17.007 ~ 8 0
84 SCMS 417 Pe* 01 00 32.6935038888 -33 41 05.066288772   20.49 19.76     ~ 3 0
85 SCMS 440 Pe* 01 00 33.0582884184 -33 43 02.260969788   19.94 19.55   18.65 ~ 3 0
86 2MASS J01003395-3340082 RG* 01 00 33.9476934528 -33 40 08.205757392   18.44 17.411   16.263 ~ 9 0
87 [CSF2018] 6-5-678 Ev* 01 00 34.1111767224 -33 35 08.830232556     19.36   18.19 ~ 4 0
88 [CSF2018] 10-7-570 Ev* 01 00 36.4177930776 -33 52 19.580368476           ~ 2 0
89 [CSF2018] 10-8-1463 Ev* 01 00 36.4708003512 -33 50 26.672500896     19.57   18.55 ~ 4 0
90 SCMS 45 Pe* 01 00 38.7198192360 -33 43 16.580603316   20.27 19.66     ~ 2 0
91 SCMS 1172 Ev* 01 00 39.7336663392 -33 39 12.381988860   20.15 19.64   18.64 ~ 4 0
92 2MASS J01004035-3344144 Pe* 01 00 40.3673701536 -33 44 14.269402356   19.53 18.76   17.58 ~ 4 0
93 GB07 Scl80 RG* 01 00 42.9699840192 -33 47 06.397032624     17.907   17.003 ~ 6 0
94 [CDB2005] 10-7-486 Pe* 01 00 45.4377507971 -33 52 14.724155469     17.91   16.65 CEMP-s 4 0
95 [CSF2018] 6-5-505 Ev* 01 00 45.7776293688 -33 38 34.910766996           CEMP-s 4 0
96 2MASS J01004628-3342338 RG* 01 00 46.2239912064 -33 42 34.065516924   19.06 18.15   16.91 ~ 6 0
97 2MASS J01004785-3341029 RG* 01 00 47.8436551872 -33 41 03.185910636   19.16 18.187   17.116 ~ 22 0
98 SCMS 1193 Ev* 01 00 48.1530658608 -33 42 13.351339152   20.19 19.66   18.64 ~ 4 0
99 [CSF2018] 10-7-442 Ev* 01 00 50.3722284696 -33 52 15.715223364     19.6   18.5 ~ 5 0
100 [CSF2018] 6-5-420 RG* 01 00 51.6553691112 -33 36 56.837225124     17.578   16.636 ~ 4 0
101 [CSF2018] 10-8-798 Pe* 01 00 56.4230648472 -33 49 47.167041576     18.78   17.6 ~ 4 0
102 [CSF2018] 10-8-758 Ev* 01 00 57.5732277432 -33 39 39.773102328     19.83   18.75 ~ 3 0
103 [CSF2018] 10-8-577 Ev* 01 01 06.9352763328 -33 46 13.196964648           ~ 2 0
104 2MASS J01011027-3338379 Ev* 01 01 10.2879750744 -33 38 37.930502580     17.95   16.7 ~ 5 0
105 [CSF2018] 10-8-462 Ev* 01 01 13.2006784752 -33 43 20.655654816     18.95   17.82 ~ 4 0
106 [CSF2018] 10-8-440 Pe* 01 01 14.3003219616 -33 39 27.925587504           ~ 1 0
107 [CSF2018] 10-8-436 Pe* 01 01 14.9557473408 -33 47 21.363558540           ~ 1 0
108 [CSF2018] 10-8-437 Ev* 01 01 15.0484285584 -33 50 02.553363816     19.19   17.97 CEMP-s 4 0
109 [CSF2018] 6-5-163 Pe* 01 01 19.9105752384 -33 35 57.595243848           ~ 1 0
110 [MFW2011] 24017 Ev* 01 01 22.2460670952 -33 46 21.849866004           ~ 10 0
111 [CSF2018] 10-8-265 Ev* 01 01 27.2223409464 -33 45 15.377225544           ~ 3 0
112 [CSF2018] 10-8-61 Ev* 01 01 47.4804961320 -33 47 27.568418604   19.482 18.674   17.671 ~ 5 0
113 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
114 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 920 0
115 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 93 0
116 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
117 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
118 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
119 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0

To bookmark this query, right click on this link: simbad:objects in 2018ApJ...856..142C and select 'bookmark this link' or equivalent in the popup menu