2023A&A...671A.124M


Query : 2023A&A...671A.124M

2023A&A...671A.124M - Astronomy and Astrophysics, volume 671A, 124 (2023/3-1)

The chemical DNA of the Magellanic Clouds I. The chemical composition of 206 Small Magellanic Cloud red giant stars.

MUCCIARELLI A., MINELLI A., BELLAZZINI M., LARDO C., ROMANO D., ORIGLIA L. and FERRARO F.R.

Abstract (from CDS):

We present the chemical composition of 206 red giant branch stars that are members of the Small Magellanic Cloud (SMC) using optical high-resolution spectra collected with the multi-object spectrograph FLAMES-GIRAFFE at the ESO Very Large Telescope. This sample includes stars in three fields that are located in different positions within the parent galaxy. We analysed the main groups of elements, namely light- (Na), α- (O, Mg, Si, Ca, and Ti), iron-peak (Sc, V, Fe, Ni, and Cu), and s-process elements (Zr, Ba, and La). The metallicity distribution of the sample displays a main peak around [Fe/H]∼-1 dex and a weak metal-poor tail. However, the three fields display different [Fe/H] distributions. In particular, a difference of 0.2 dex is found between the mean metallicities of the two innermost fields. The fraction of metal-poor stars increases significantly (from ∼1 to ∼20%) from the innermost fields to the outermost field, likely reflecting an age gradient in the SMC. We also found an indication of possible chemically and kinematic distinct substructures. The ratios of the SMC stars are clearly distinct from those of Milky Way stars, in particular, for the elements produced by massive stars (e.g. Na, α, and most iron-peak elements), whose abundance ratios are systematically lower than those measured in our Galaxy. This shows that massive stars contributed less to the chemical enrichment of the SMC than the Milky Way, according to the low star formation rate expected for this galaxy. Finally, we identified small systematic differences in the abundances of some elements (Na, Ti, V, and Zr) in the two innermost fields, suggesting that the chemical enrichment history in the SMC has not been uniform.

Abstract Copyright: © The Authors 2023

Journal keyword(s): Magellanic Clouds - techniques: spectroscopic - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/671/A124): table2.dat table3.dat table5.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion 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 - 2024
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3922 0
2 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 311 0
3 NAME Magellanic Stream HVC 00 32 -30.0           ~ 973 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
5 NGC 339 OpC 00 57 47.62 -74 28 14.6 13.23 12.94 12.21   11.20 ~ 145 0
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1366 4
7 NGC 419 OpC 01 08 17.26 -72 53 01.8 11.41 11.16 10.50   9.34 ~ 272 0
8 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5847 1
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
10 NGC 1210 Sy2 03 06 45.3516825024 -25 42 58.855024728   13.70   12.54   ~ 43 0
11 NAME Magellanic Bridge HI 03 11 -77.5           ~ 449 1
12 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1433 0
13 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 312 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
15 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 819 0
16 NGC 2005 Cl* 05 30 08.500 -69 45 14.42   12.30 11.57     ~ 94 0
17 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 426 0
18 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3433 0
19 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1982 0
20 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2195 2
21 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 531 0

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