2019A&A...626A..15H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:55:38

2019A&A...626A..15H - Astronomy and Astrophysics, volume 626A, 15-15 (2019/6-1)

VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy.

HILL V., SKULADOTTIR A., TOLSTOY E., VENN K.A., SHETRONE M.D., JABLONKA P., PRIMAS F., BATTAGLIA G., DE BOER T.J.L., FRANCOIS P., HELMI A., KAUFER A., LETARTE B., STARKENBURG E. and SPITE M.

Abstract (from CDS):

We present detailed chemical abundances for 99 red-giant branch stars in the centre of the Sculptor dwarf spheroidal galaxy, which have been obtained from high-resolution VLT/FLAMES spectroscopy. The abundances of Li, Na, α-elements (O, Mg, Si, Ca Ti), iron-peak elements (Sc, Cr, Fe, Co, Ni, Zn), and r- and s-process elements (Ba, La, Nd, Eu) were all derived using stellar atmosphere models and semi-automated analysis techniques. The iron abundances populate the whole metallicity distribution of the galaxy with the exception of the very low metallicity tail, -2.3≤[Fe/H]≤-0.9. There is a marked decrease in [α/Fe] over our sample, from the Galactic halo plateau value at low [Fe/H] and then, after a "knee", a decrease to sub-solar [α/Fe] at high [Fe/H]. This is consistent with products of core-collapse supernovae dominating at early times, followed by the onset of supernovae type Ia as early as ∼12Gyr ago. The s-process products from low-mass AGB stars also participate in the chemical evolution of Sculptor on a timescale comparable to that of supernovae type Ia. However, the r-process is consistent with having no time delay relative to core-collapse supernovae, at least at the later stages of the chemical evolution in Sculptor. Using the simple and well-behaved chemical evolution of Sculptor, we further derive empirical constraints on the relative importance of massive stars and supernovae type Ia to the nucleosynthesis of individual iron-peak and α-elements. The most important contribution of supernovae type Ia is to the iron-peak elements: Fe, Cr, and Mn. There is, however, also a modest but non-negligible contribution to both the heavier α-elements: S, Ca and Ti, and some of the iron-peak elements: Sc and Co. We see only a very small or no contribution to O, Mg, Ni, and Zn from supernovae type Ia in Sculptor. The observed chemical abundances in Sculptor show no evidence of a significantly different initial mass function, compared to that of the Milky Way. With the exception of neutron-capture elements at low [Fe/H], the scatter around mean trends in Sculptor for [Fe/H]>-2.3 is extremely low, and compatible with observational errors. Combined with the small scatter in the age-elemental abundances relation, this calls for an efficient mixing of metals in the gas in the centre of Sculptor since ∼12Gyr ago.

Abstract Copyright: © V. Hill et al. 2019

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

VizieR on-line data: <Available at CDS (J/A+A/626/A15): tablec1.dat tablec2.dat tablec3.dat tablec4.dat tablec5.dat>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

CDS comments: H497 probable misprint for H479

Simbad objects: 35

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Number of rows : 35

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 UCAC4 282-001099 Pe* 00 59 12.099 -33 46 20.87       16.36 15.98 ~ 6 0
2 2MASS J00592065-3348566 RG* 00 59 20.6548592684 -33 48 56.733864547     17.136     ~ 6 0
3 2MASS J00592830-3342073 RG* 00 59 28.2992623536 -33 42 07.403794654     17.118   15.405 M1 14 0
4 2MASS J00594641-3341233 RG* 00 59 46.4184190436 -33 41 23.404479563     17.304   15.695 ~ 15 0
5 2MASS J00595422-3340270 RG* 00 59 54.2190683252 -33 40 27.065146835   18.84 17.480   16.044 ~ 11 0
6 2MASS J00595563-3333246 RG* 00 59 55.6380234837 -33 33 24.702775226     16.890     ~ 7 0
7 2MASS J00595568-3346400 RG* 00 59 55.6840300710 -33 46 40.035965746   18.48 17.233   15.845 ~ 11 0
8 2MASS J00595827-3341087 RG* 00 59 58.2618061098 -33 41 08.667881967   18.89 17.679   16.324 ~ 14 0
9 ALW Sculptor 3 C* 00 59 58.9375007186 -33 28 35.163223393   20.20 16.23 16.53 16.70 ~ 14 0
10 2MASS J01000268-3330253 RG* 01 00 02.6925537163 -33 30 25.305872094     18.017   16.69 ~ 7 0
11 2MASS J01000419-3343324 RG* 01 00 04.1648181392 -33 43 32.439025859   19.12 18.068   16.916 ~ 9 0
12 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
13 [STS2015] ET0206 RG* 01 00 10.3955700945 -33 41 04.749827913   19.27 18.086   16.852 ~ 10 0
14 GB07 Scl67 RR* 01 00 11.7318455581 -33 44 50.369167235   18.84 17.809   16.58 ~ 9 0
15 2MASS J01001255-3343011 RG* 01 00 12.5297795196 -33 43 01.361019186   19.23 18.125   16.897 ~ 15 0
16 2MASS J01001278-3341157 RG* 01 00 12.7788555195 -33 41 15.834372068   18.48 17.280   15.833 ~ 14 0
17 2MASS J01001830-3342122 RG* 01 00 18.2971209926 -33 42 12.275746482   18.86 17.518   16.139 ~ 17 0
18 2MASS J01001897-3345147 RG* 01 00 18.9670563370 -33 45 14.790315596   18.74 17.677   16.437 ~ 11 0
19 2MASS J01002118-3346012 RG* 01 00 21.1695393626 -33 46 01.178757993   19.17 18.004   16.7 ~ 7 0
20 2MASS J01002384-3342173 RG* 01 00 23.8408373454 -33 42 17.456597664   18.64 17.333   15.830 ~ 14 0
21 2MASS J01002463-3344287 RG* 01 00 24.6295780776 -33 44 28.871146731   18.88 17.783   16.470 ~ 11 0
22 2MASS J01002531-3350506 RG* 01 00 25.3040488612 -33 50 50.660945315     17.109     ~ 7 0
23 2MASS J01003404-3339046 RG* 01 00 34.0453633294 -33 39 04.631818676   19.05 17.200   15.499 ~ 11 0
24 2MASS J01004250-3344235 RG* 01 00 42.5022637693 -33 44 23.517963717   18.7 17.208   15.701 M 15 0
25 2MASS J01005087-3345053 RG* 01 00 50.8766529690 -33 45 05.307859726     17.213     ~ 7 0
26 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 178 0
27 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
28 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 706 0
29 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 791 0
30 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1178 0
31 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1165 1
32 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1799 1
33 NAME Local Group GrG ~ ~           ~ 6973 0
34 [H65] H * ~ ~     19.08     ~ 3 0
35 NAME Galactic Bulge reg ~ ~           ~ 3391 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:55:38

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