2018A&A...615A.137S


Query : 2018A&A...615A.137S

2018A&A...615A.137S - Astronomy and Astrophysics, volume 615A, 137-137 (2018/7-1)

The chemical connection between damped Lyman-α systems and Local Group dwarf galaxies.

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

Abstract (from CDS):

Abundances of the volatile elements S and Zn have now been measured in around 80 individual stars in the Sculptor dwarf spheroidal galaxy, covering the metallicity range -2.4≤[Fe/H]≤-0.9. These two elements are of particular interest as they are not depleted onto dust in gas, and their ratio, [S/Zn], has thus commonly been used as a proxy for [α/Fe] in Damped Lyman-α systems (DLAs). The S abundances in Sculptor are similar to other α-elements in this galaxy, consistent with S being mainly created in core-collapse supernovae, but also having some contribution from type Ia supernovae. However, our results show that Zn and Fe do not trace all the same nucleosynthetic production channels. In particular, (contrary to Fe) Zn is not significantly produced by type Ia supernovae. Thus, [S/Zn] cannot be reliably used as a proxy for [α/Fe]. We propose [O/S] as a function of [S/H] as a possible alternative. At higher metallicities, the values of [S/Zn] measured in DLAs are inconsistent with those in local dwarf galaxies, and are more compatible with the Milky Way disk. Low-metallicity DLAs are, however, consistent with the most metal-poor stars in Local Group dwarf spheroidal galaxies. Assuming that the dust depletions of S and Zn are negligible, our comparison indicates that the star formation histories of DLAs are on average different from both the Milky Way and the Sculptor dwarf spheroidal galaxy.

Abstract Copyright: © ESO 2018

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

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1251 4
2 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1633 1
3 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1065 0
4 NAME Harrington-Wilson No1 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1136 1
5 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 783 0
6 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 391 0
7 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1276 0
8 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1257 1
9 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1990 2
10 NAME Local Group GrG ~ ~           ~ 7772 0

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2022.10.01-12:47:01

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