2010A&A...524A..58T

Query : 2010A&A...524A..58T

2010A&A...524A..58T - Astronomy and Astrophysics, volume 524A58-58 (2010/12-1)

Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans.

TAFELMEYER M., JABLONKA P., HILL V., SHETRONE M., TOLSTOY E., IRWIN M.J., BATTAGLIA G., HELMI A., STARKENBURG E., VENN K.A., ABEL T., FRANCOIS P., KAUFER A., NORTH P., PRIMAS F. and SZEIFERT T.

Abstract (from CDS):

We present the results of a dedicated search for extremely metal-poor stars in the Fornax, Sculptor, and Sextans dSphs. Five stars were selected from two earlier VLT/Giraffe and HET/HRS surveys and subsequently followed up at high spectroscopic resolution with VLT/UVES. All of them turned out to have [Fe/H]≲-3 and three stars are below [Fe/H]~-3.5. This constitutes the first evidence that the classical dSphs Fornax and Sextans join Sculptor in containing extremely metal-poor stars and suggests that all of the classical dSphs contain extremely metal-poor stars. One giant in Sculptor at [Fe/H]=-3.96±0.06 is the most metal-poor star ever observed in an external galaxy. We carried out a detailed analysis of the chemical abundances of the α, iron peak, and the heavy elements, and we performed a comparison with the Milky Way halo and the ultra faint dwarf stellar populations. Carbon, barium, and strontium show distinct features characterized by the early stages of galaxy formation and can constrain the origin of their nucleosynthesis.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - Galaxy: evolution - Galaxy: stellar content - galaxies: star formation

Errata: + corrigendum vol. 527, C1 (2011)

CDS comments: Table 1 : Fnx M dwarf not identified. Table 5 HE 0132-2429 is a probable misprint for HE 0132-2439.

Simbad objects: 45

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Number of rows : 45
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 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 233 0
2 GB07 Scl49 RG* 00 59 08.6092477128 -33 42 29.639424852     17.975   16.89 ~ 18 0
3 2MASS J00594706-3342543 RG* 00 59 47.0571830400 -33 42 54.294121548     17.810   16.721 ~ 17 0
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
5 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
6 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
7 [BTH2006] fnx-05 042 RG* 02 41 30.9834683776 -33 55 44.764614638           ~ 8 0
8 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
9 [FSG2010] UMaII-S1 RG* 08 49 53.4624869976 +63 08 21.677104536           ~ 15 0
10 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
11 [FSG2010] UMaII-S2 RG* 08 52 33.5093638824 +63 05 01.103748900           F5 17 0
12 [AAS2009] S 12-28 * 10 11 17.15 -02 00 24.0     17.52   16.44 ~ 6 0
13 [AAS2009] S 15-19 RG* 10 11 26.9485167768 -02 05 41.849536236     17.54   16.53 ~ 11 0
14 2MASS J10114299-0203505 * 10 11 42.9869230392 -02 03 50.566991580     17.53   16.38 ~ 11 0
15 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
16 2MASS J10132446-0212037 * 10 13 24.4692147144 -02 12 03.720309732     18.06   17.06 ~ 11 0
17 [AAS2009] S 10-14 * 10 13 34.7014899696 -02 07 58.101516552     17.64   16.56 ~ 8 0
18 2MASS J10134175-0211244 RG* 10 13 41.7632659656 -02 11 24.408856392           ~ 14 0
19 2MASS J10134548-0156167 * 10 13 45.4813668120 -01 56 16.468272924     17.96   16.90 ~ 10 0
20 [AAS2009] S 24-72 Pe* 10 15 02.6077156167 -01 29 55.016132612           ~ 10 0
21 NAME UMa Region reg 11 00 +50.0           ~ 333 0
22 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
23 BPS BS 16928-0053 Pe* 12 22 28.0240827648 +34 11 31.690230360   14.38 13.54 12.886 12.339 ~ 25 0
24 2MASS J12265545+2356095 RG* 12 26 55.4572934232 +23 56 09.812887008           ~ 10 0
25 2MASS J12265667+2356117 RG* 12 26 56.6612585616 +23 56 11.829707844           ~ 9 0
26 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
27 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
28 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 53 0
29 HE 1347-1025 Pe* 13 50 22.3970330568 -10 40 18.942310344   15.727 15.013     ~ 15 0
30 2MASS J13583380+1421083 RB? 13 58 33.8132852928 +14 21 08.488847052           ~ 30 0
31 HE 1356-0622 Pe* 13 59 30.3168806616 -06 36 34.904583792   14.995 14.268 14.313   ~ 16 0
32 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
33 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
34 BPS BS 16550-0087 Pe* 14 10 26.7272915496 +18 01 23.732433480   14.59 13.76 13.211 12.688 ~ 28 0
35 HE 1424-0241 Pe* 14 26 40.3306297920 -02 54 27.487168164   15.892 15.45 14.887 14.54 ~ 40 0
36 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
37 BPS CS 30312-0059 Pe* 15 34 48.8386814136 -01 23 37.343777064   13.85 13.14 12.596 12.065 ~ 29 0
38 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
39 BPS BS 16084-0160 Pe* 16 28 50.7923247984 +54 37 06.886218324   13.94 13.12 12.630 12.103 ~ 22 0
40 2MASS J16391853+6057426 Pe* 16 39 18.5345769192 +60 57 42.547552920   13.50 12.79   11.786 ~ 20 0
41 Irwin Dra 21275 RG* 17 19 41.8450006104 +57 52 19.249564872   18.07 16.950 16.131 15.479 ~ 21 0
42 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
43 2MASS J17214368+5757126 RG* 17 21 43.7161768632 +57 57 12.545635572   18.081 17.145 16.565 15.929 ~ 11 0
44 2MASS J17215819+5756042 Pe* 17 21 58.2105923256 +57 56 04.073828424   18.191 17.163 16.515 15.803 ~ 10 0
45 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773     8.9 8.6   G0III 144 0

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