2015A&A...583A..67J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:42:33

2015A&A...583A..67J - Astronomy and Astrophysics, volume 583A, 67-67 (2015/11-1)

The early days of the Sculptor dwarf spheroidal galaxy.

JABLONKA P., NORTH P., MASHONKINA L., HILL V., REVAZ Y., SHETRONE M., STARKENBURG E., IRWIN M., TOLSTOY E., BATTAGLIA G., VENN K., HELMI A., PRIMAS F. and FRANCOIS P.

Abstract (from CDS):

We present the high-resolution spectroscopic study of five -3.9≤[Fe/H]≤-2.5 stars in the Local Group dwarf spheroidal, Sculptor, thereby doubling the number of stars with comparable observations in this metallicity range. We carry out a detailed analysis of the chemical abundances of α, iron peak, and light and heavy elements, and draw comparisons with the Milky Way halo and the ultra-faint dwarf stellar populations. We show that the bulk of the Sculptor metal-poor stars follow the same trends in abundance ratios versus metallicity as the Milky Way stars. This suggests similar early conditions of star formation and a high degree of homogeneity of the interstellar medium. We find an outlier to this main regime, which seems to miss the products of the most massive of the Type II supernovae. In addition to its help in refining galaxy formation models, this star provides clues to the production of cobalt and zinc. Two of our sample stars have low odd-to-even barium isotope abundance ratios, suggestive of a fair proportion of s-process. We discuss the implication for the nucleosynthetic origin of the neutron capture elements.

Abstract Copyright:

Journal keyword(s): stars: abundances - Local Group - galaxies: dwarf - galaxies: formation

Nomenclature: Table 1: [SHT2013] Scl NN NNN N=1 (Nos Scl 03 059) added.

CDS comments: ET0381 is probably 2MASS J01001295-3342038 in SIMBAD.

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SDSS J001820.51-093939.2 Pe* 00 18 20.5088160659 -09 39 39.110394579           ~ 17 0
2 [SHT2013] Scl031 11 * 00 57 10.2179307029 -33 28 35.800749335   18.765 17.798   16.655 ~ 6 0
3 [SHT2013] Scl074 02 * 00 57 34.8469819347 -33 39 45.710501464   19.017 18.058   16.962 ~ 5 0
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
5 GB07 Scl41 RR* 01 00 12.956 -33 42 03.86   18.96 18.029   16.84 ~ 11 0
6 2MASS J01012225-3346218 RR* 01 01 22.2460493291 -33 46 21.851216516           ~ 6 0
7 [SHT2013] Scl002 06 * 01 01 26.7625404630 -33 02 59.803757674   18.265 17.120   15.784 ~ 4 0
8 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
9 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 706 0
10 HD 88609 Pe* 10 14 28.9854651931 +53 33 39.345145786 9.930 9.540 8.620 7.78 7.15 G5IIIw 186 0
11 NAME UMa Region reg 11 00 +50.0           ~ 316 0
12 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 318 1
13 HE 1219-0312 Pe* 12 21 34.1430157283 -03 28 39.635608057     15.940   15.043 ~ 31 0
14 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 389 1
15 HD 122563 Pe* 14 02 31.8456299772 +09 41 09.942736952 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 746 0
16 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1178 0
17 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 852 0
18 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1165 1
19 [BS61] 119 RG* 17 20 16.1313606417 +57 52 55.987095168   18.62 17.635 16.859 16.224 ~ 35 0
20 HE 2327-5642 Pe* 23 30 37.0896402813 -56 26 14.384633079   14.590 13.881 13.425 12.948 ~ 27 0
21 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:42:33

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