2015A&A...574A.129S

Query : 2015A&A...574A.129S

2015A&A...574A.129S - Astronomy and Astrophysics, volume 574A, 129-129 (2015/2-1)

The first carbon-enhanced metal-poor star found in the Sculptor dwarf spheroidal.

SKULADOTTIR A., TOLSTOY E., SALVADORI S., HILL V., PETTINI M., SHETRONE M.D. and STARKENBURG E.

Abstract (from CDS):

The origin of carbon-enhanced metal-poor (CEMP) stars and their possible connection with the chemical elements produced by the first stellar generation is still highly debated. In contrast to the Galactic halo, not many CEMP stars have been found in the dwarf spheroidal galaxies around the Milky Way. Here we present detailed abundances from ESO VLT/UVES high-resolution spectroscopy for ET0097, the first CEMP star found in the Sculptor dwarf spheroidal, which is one of the best studied dwarf galaxies in the Local Group. This star has [Fe/H]=-2.03±0.10, [C/Fe]=0.51±0.10 and [N/Fe]=1.18±0.20, which is the first nitrogen measurement in this galaxy. The traditional definition of CEMP stars is [C/Fe]≥0.70, but taking into account that this luminous red giant branch star has undergone mixing, it was intrinsically less nitrogen enhanced and more carbon-rich when it was formed, and so it falls under the definition of CEMP stars, as proposed by Aoki et al. (2007ApJ...655..492A) to account for this effect. By making corrections for this mixing, we conclude that the star had [C/Fe]≃0.8 during its earlier evolutionary stages. Apart from the enhanced C and N abundances, ET0097 shows no peculiarities in other elements lighter than Zn, and no enhancement of the heavier neutron-capture elements (Ba, La, Ce, Nd, Sm, Eu, Dy), making this a CEMP-no star. However, the star does show signs of the weak r-process, with an overabundance of the lighter neutron-capture elements (Sr, Y, Zr). To explain the abundance pattern observed in ET0097, we explore the possibility that this star was enriched by primordial stars. In addition to the detailed abundances for ET0097, we present estimates and upper limits for C abundances in 85 other stars in Sculptor derived from CN molecular lines, including 11 stars with [Fe/H]≤-2. Combining these limits with observations from the literature, the fraction of CEMP-no stars in Sculptor seems to be significantly lower than in the Galactic halo.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: individual: Sculptor dwarf spheroidal - galaxies: abundances - galaxies: dwarf - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/574/A129): table4.dat table6.dat>

Nomenclature: Tables 1,3,5: [STS2015] ET0097 N=1, Table 6: [STS2015] ETNNNN N=85 among (nos 0024-0392).

Simbad objects: 93

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Number of rows : 93
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 GB07 Scl49 RG* 00 59 08.6092477128 -33 42 29.639424852     17.975   16.89 ~ 18 0
2 GB07 Scl40 RG* 00 59 11.8369720920 -33 41 25.393824420     17.476   16.297 ~ 12 0
3 GB07 Scl31 RG* 00 59 15.1362866376 -33 39 43.989936516     18.060   16.9 ~ 9 0
4 GB07 Scl51 RG* 00 59 15.1497010944 -33 42 54.825947172     17.651   16.34 ~ 12 0
5 GB07 Scl45 RG* 00 59 18.8518180728 -33 42 17.661046716     17.599   16.23 ~ 13 0
6 GB07 Scl85 RG* 00 59 20.6551516032 -33 48 56.734579548     17.136   15.789 ~ 12 0
7 GB07 Scl61 RG* 00 59 20.8105516800 -33 44 04.965116928     17.210   15.985 ~ 14 0
8 GB07 Scl86 RG* 00 59 22.1275882104 -33 49 03.818775468     17.969   16.75 ~ 10 0
9 FBMC Sculptor 24 RG* 00 59 28.2992013384 -33 42 07.401951684     17.118   15.405 M1? 20 0
10 2MASS J00593045-3336050 RG* 00 59 30.4429475592 -33 36 05.177031912     17.947   16.732 ~ 17 0
11 2MASS J00593048-3339041 RG* 00 59 30.4985299992 -33 39 04.087610208     17.981   16.967 ~ 12 0
12 GB07 Scl93 RG* 00 59 35.0237052024 -33 50 55.932551700     18.235   17.184 ~ 9 0
13 GB07 Scl03 RG* 00 59 36.9963754728 -33 30 28.411757388     17.706   16.43 ~ 13 0
14 GB07 Scl20 RG* 00 59 37.2296251488 -33 37 10.669725192     17.608   16.339 ~ 12 0
15 GB07 Scl56 RG* 00 59 37.5751730520 -33 43 33.604843728     18.012   16.734 ~ 14 0
16 2MASS J00593774-3336000 RG* 00 59 37.7515021344 -33 36 00.129480048     17.541   16.19 ~ 10 0
17 GB07 Scl08 RG* 00 59 38.1221234952 -33 35 08.118471876     17.537   16.157 ~ 16 0
18 GB07 Scl10 RG* 00 59 40.4694214392 -33 35 53.980336572     17.699   16.427 ~ 14 0
19 GB07 Scl25 RG* 00 59 41.4061897224 -33 38 47.128302744     17.615   16.387 ~ 12 0
20 2MASS J00594193-3345027 RG* 00 59 41.939 -33 45 02.75     18.337     ~ 6 0
21 SCMS 1433 RG* 00 59 42.5847151584 -33 42 18.221298552   18.95 17.563   16.15 ~ 13 0
22 GB07 Scl65 RG* 00 59 44.9121116856 -33 44 35.086300224     18.126   16.829 ~ 14 0
23 2MASS J00594529-3343540 RG* 00 59 45.3196054656 -33 43 53.844320496   19.01 17.913   16.689 ~ 15 0
24 2MASS J00594641-3341233 RG* 00 59 46.4184215160 -33 41 23.404330104     17.304   15.695 ~ 20 0
25 GB07 Scl05 RG* 00 59 47.2196929152 -33 33 37.069607988     17.608   16.451 ~ 15 0
26 FBMC Sculptor 8 RG* 00 59 47.6780007792 -33 47 29.414047272     17.814   16.426 M 18 0
27 SCMS 237 RG* 00 59 49.9183006128 -33 44 05.071859160   18.92 17.827   16.57 ~ 12 0
28 2MASS J00595077-3331472 RG* 00 59 50.7907567584 -33 31 47.227464012     17.982   16.871 ~ 9 0
29 2MASS J00595228-3344546 RG* 00 59 52.2831866088 -33 44 54.732927732   18.57 17.150   15.743 ~ 17 0
30 SCMS 240 RG* 00 59 53.0842004544 -33 43 58.559329092   19.52 18.470   17.31 ~ 11 0
31 SCMS 1493 RG* 00 59 53.9904922272 -33 37 42.187946052   18.98 17.847   16.568 ~ 15 0
32 SCMS 287 RG* 00 59 54.2190765936 -33 40 27.064407108   18.84 17.480   16.044 ~ 17 0
33 2MASS J00595448-3337533 RG* 00 59 54.4771909632 -33 37 53.476829832   18.76 17.770   16.608 ~ 16 0
34 GB07 Scl04 RG* 00 59 55.6380103536 -33 33 24.702228000     16.890   15.806 ~ 13 0
35 SCMS 195 RG* 00 59 55.6838573184 -33 46 40.033427412   18.48 17.233   15.845 ~ 18 0
36 SCMS 203 RG* 00 59 55.8742577088 -33 45 43.659425520   19.41 18.356   17.188 ~ 15 0
37 SCMS 1499 RG* 00 59 56.6032438584 -33 36 41.785019424   18.64 17.434   16.231 ~ 12 0
38 2MASS J00595762-3338325 RG* 00 59 57.6067016688 -33 38 32.487799092   19.08 17.940   16.677 ~ 15 0
39 FBMC Sculptor 7 RG* 00 59 58.2472228488 -33 45 50.679322272   19.01 17.723   16.367 M? 18 0
40 SCMS 648 RG* 00 59 58.2618198936 -33 41 08.665931004   18.89 17.679   16.324 ~ 19 0
41 GB07 Scl07 RG* 00 59 58.3138727640 -33 34 40.465782840     17.983   16.7 ~ 12 0
42 SCMS 310 RG* 00 59 59.6480602464 -33 39 31.889811312   19.15 18.031   16.806 ~ 16 0
43 GB07 Scl88 RG* 01 00 00.5007446232 -33 49 35.622812280     17.512   16.397 ~ 12 0
44 GB07 Scl34 RG* 01 00 02.2286422032 -33 40 21.002668212     18.008   16.779 ~ 13 0
45 GB07 Scl01 RG* 01 00 02.6924413920 -33 30 25.307967420     18.017   16.69 ~ 12 0
46 GB07 Scl29 RG* 01 00 03.6009724128 -33 39 27.082629936     17.607   16.233 ~ 15 0
47 SCMS 874 RG* 01 00 04.1647961880 -33 43 32.437216992   19.12 18.068   16.916 ~ 13 0
48 2MASS J01000594-3345564 RG* 01 00 05.9357621616 -33 45 56.440573956   19.02 17.964   16.715 ~ 15 0
49 SCMS 165 RG* 01 00 06.9734244432 -33 47 09.509924580   18.99 17.942   16.596 ~ 16 0
50 SCMS 1522 RG* 01 00 07.5807662184 -33 37 03.873555192   18.74 17.457   16.185 ~ 18 0
51 SCMS 1530 RG* 01 00 09.1891833792 -33 36 09.402872760   19.07 17.924   16.657 ~ 15 0
52 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1358 4
53 GB07 Scl36 RG* 01 00 10.3954863648 -33 41 04.745722200   19.27 18.086   16.852 ~ 15 0
54 SCMS 1314 RG* 01 00 10.4927339856 -33 49 36.752162196   18.98 17.829   16.533 ~ 14 0
55 2MASS J01001174-3344503 RG* 01 00 11.7319642224 -33 44 50.369156700   18.84 17.809   16.58 ~ 14 0
56 SCMS 1072 RG* 01 00 11.7997910808 -33 42 16.971833268   19.05 17.786   16.44 ~ 13 0
57 SCMS 1023 RG* 01 00 12.5294537376 -33 43 01.362185616   19.23 18.125   16.897 ~ 19 0
58 SCMS 1088 RG* 01 00 12.7787910984 -33 41 15.835376436   18.48 17.280   15.833 ~ 20 0
59 SCMS 1104 RG* 01 00 13.9556740320 -33 36 39.214039572   19.05 17.847   16.521 ~ 14 0
60 SCMS 128 RG* 01 00 14.5776018744 -33 47 11.465602332   19.08 18.016   16.771 ~ 15 0
61 SCMS 1103 RG* 01 00 14.8194921864 -33 36 49.887174600   19.11 17.965   16.709 ~ 14 0
62 SCMS 1013 RG* 01 00 15.1842726864 -33 43 11.054632188   19.22 17.980   16.69 ~ 12 0
63 FBMC Sculptor 13 RG* 01 00 15.3744918792 -33 39 06.074895024   18.73 17.287   15.840 ~ 18 0
64 SCMS 999 RG* 01 00 17.3663596296 -33 43 59.631215916   19.01 17.947   16.692 ~ 16 0
65 SCMS 123 RG* 01 00 17.6015235720 -33 46 55.084242612   19.08 18.038   16.821 ~ 15 0
66 SCMS 1113 RG* 01 00 17.7719553456 -33 35 59.739485784   18.82 17.345   15.818 ~ 17 0
67 SCMS 966 RG* 01 00 18.2971609608 -33 42 12.275880696   18.86 17.518   16.139 ~ 21 0
68 SCMS 819 RG* 01 00 18.9671355048 -33 45 14.789759148   18.74 17.677   16.437 ~ 16 0
69 SCMS 1116 RG* 01 00 20.2979777304 -33 35 34.535838516   18.66 17.495   16.295 ~ 12 0
70 FBMC Sculptor 3 RG* 01 00 20.7588031896 -33 47 10.954559796   18.64 17.392   16.068 C? 18 0
71 GB07 Scl06 RG* 01 00 21.0879497544 -33 33 46.433808612     18.082   16.821 ~ 14 0
72 SCMS 506 RG* 01 00 21.1700352312 -33 46 01.175332044   19.17 18.004   16.7 ~ 12 0
73 2MASS J01002234-3350239 RG* 01 00 22.3298123136 -33 50 23.891305560     17.714   16.39 ~ 9 0
74 SCMS 2 RG* 01 00 22.9818529296 -33 43 02.244501012   18.94 17.485   15.982 ~ 18 0
75 SCMS 770 RG* 01 00 23.8407130248 -33 42 17.457837732   18.64 17.333   15.830 ~ 20 0
76 SCMS 796 RG* 01 00 24.6294006432 -33 44 28.870973232   18.88 17.783   16.470 ~ 17 0
77 SCMS 778 RG* 01 00 25.0460302800 -33 42 28.220051880   19.27 18.149   16.96 ~ 12 0
78 GB07 Scl92 RG* 01 00 25.3042017624 -33 50 50.659631952     17.109   15.651 ~ 12 0
79 SCMS 483 RG* 01 00 26.2903582464 -33 44 45.685727448   19.16 18.039   16.83 ~ 11 0
80 2MASS J01003039-3341439 * 01 00 30.3898422768 -33 41 43.991199528           ~ 3 0
81 SCMS 65 RG* 01 00 33.8625481680 -33 44 54.401770104   18.92 17.796   16.544 ~ 15 0
82 SCMS 10 RG* 01 00 34.0454042136 -33 39 04.630006008   19.05 17.200   15.499 ~ 17 0
83 GB07 Scl90 RG* 01 00 34.3299461520 -33 49 52.786020432     17.869   16.495 ~ 15 0
84 GB07 Scl84 RG* 01 00 38.1285368136 -33 48 16.894682136     17.212   15.730 ~ 17 0
85 FBMC Sculptor 6 RG* 01 00 42.5023936080 -33 44 23.514916092   18.7 17.208   15.701 M? 19 0
86 GB07 Scl87 RG* 01 00 44.2792960392 -33 49 18.837875928     17.478   16.006 ~ 17 0
87 GB07 Scl70 RG* 01 00 50.8765974192 -33 45 05.308669332     17.213   15.714 ~ 12 0
88 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 244 0
89 NAME Sextans dSph G 10 13 02.9 -01 36 53   12 10.4     ~ 853 0
90 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 202 0
91 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 854 0
92 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 448 0
93 NAME Local Group GrG ~ ~           ~ 8387 0

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