2023A&A...671A.137L


Query : 2023A&A...671A.137L

2023A&A...671A.137L - Astronomy and Astrophysics, volume 671A, 137 (2023/3-1)

Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5, and Trumpler 20.

LUCERTINI F., MONACO L., CAFFAU E., MUCCIARELLI A., VILLANOVA S., BONIFACIO P. and SBORDONE L.

Abstract (from CDS):

Context. Sulfur (S) is one of the lesser-studied α-elements. Published investigations of its behavior have so far focused on local stars, and only a few clusters of the Milky Way have been considered to study this topic. We aim to study the S content of the globular cluster Ruprecht 106 - which has never before been studied for this purpose, but is known to present low levels of the [α/Fe] abundance ratio - and the open cluster Trumpler 5. The only star studied so far in Trumpler 5 shows an unexpectedly low abundance of S.
Aims. With this work, we aim to provide the first S abundance in Ruprecht 106 and to investigate the S content of Trumpler 5 with a larger sample of stars. The open cluster Trumpler 20 is considered as a reference object.
Methods. We performed a standard abundance analysis based on 1D model atmospheres in local thermodynamical equilibrium (LTE) and on high-resolution and high-signal-to-noise-ratio UVES-slit and UVES/FLAMES spectra. We also applied corrections for nonLTE. The metallicities of the targets were obtained by studying equivalent widths. Sulfur abundances were derived from multiplets 1, 6, and 8 by spectrosynthesis.
Results. We find that the metallicities of Ruprecht 106 and Trumpler 5 are [Fe/H] = -1.37±0.11 and [Fe/H] = -0.49±0.14, respectively. Ruprecht 106 is less S-rich than the other Galactic clusters at similar metallicity. The low S content of Ruprecht 106, [S/Fe]NLTE = -0.52±0.13, is consistent with its shortage of α-elements. This supports an extra-galactic origin of this cluster. We obtained a new and more robust S content value of Trumpler 5 of about [S/Fe]NLTE = 0.05±0.20. According to our results, Trumpler 5 follows the trend of the Galactic disk in the [S/Fe]LTE versus [Fe/H] diagram. Our results for Trumpler 20, of namely [Fe/H]= 0.06±0.15 and [S/Fe]NLTE = -0.28±0.21, are in agreement with those in the literature.

Abstract Copyright: © The Authors 2023

Journal keyword(s): stars: abundances - globular clusters: individual: Rup106 - open clusters and associations: individual: Tr5 - open clusters and associations: individual: Tr20

Simbad objects: 40

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Number of rows : 40
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 47 GiG 00 14 30.6262089120 -07 10 02.807512896   13.4   12.48 13.0 ~ 33 0
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3922 0
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1366 4
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
5 NGC 2243 OpC 06 29 34.8 -31 16 55   10.12 9.4     ~ 269 0
6 Cl* Trumpler 5 K 3-4876 * 06 36 21.7943550768 +09 33 23.143406760           ~ 5 0
7 Cl* Trumpler 5 K 3-3678 HB* 06 36 23.8594719312 +09 30 28.488223152   16.560 14.889 14.349   ~ 11 0
8 Cl Trumpler 5 OpC 06 36 30.2 +09 27 54           ~ 122 0
9 Cl* Trumpler 5 K 3-4791 * 06 36 33.1501841904 +09 33 03.645189180   16.525 14.999     ~ 7 0
10 Cl* Trumpler 5 K 3-4528 RG* 06 36 39.8289200304 +09 32 18.678899436           ~ 11 0
11 Cl* Trumpler 5 K 3-3416 HB* 06 36 40.2001267056 +09 29 47.779130328   16.566 15.042     ~ 18 0
12 Cl* Trumpler 5 K 3-1318 * 06 36 53.4672560616 +09 25 34.578101784   16.554 15.005     ~ 7 0
13 NGC 2477 OpC 07 52 11.0 -38 32 13   6.64 5.8     ~ 290 0
14 Cl* Ruprecht 106 BBF 1-1863 * 12 38 34.7532841094 -51 08 01.916129082   17.53 16.42     ~ 1 0
15 Cl* Ruprecht 106 BBF 1-1951 * 12 38 35.4754518951 -51 07 52.572695498   16.81 15.49     ~ 1 0
16 Cl* Ruprecht 106 BBF 1-801 * 12 38 36.0010403106 -51 09 37.524687987   17.81 16.71     ~ 1 0
17 2MASS J12383655-5108256 LP* 12 38 36.5536887351 -51 08 25.718845912   16.40 14.73     ~ 2 0
18 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 379 0
19 Cl* Ruprecht 106 BBF 1-2004 * 12 38 40.9610648319 -51 07 46.417193837   16.35 14.82     ~ 1 0
20 Cl* Ruprecht 106 BBF 1-676 * 12 38 43.8315479997 -51 09 50.939358107   17.45 16.30     ~ 1 0
21 Cl* Ruprecht 106 BBF 1-2032 * 12 38 48.9300698760 -51 07 43.276689211   17.56 16.46     ~ 1 0
22 Cl* Trumpler 20 PMF 5320 * 12 39 04.1070291432 -60 34 00.126914988 14.995 15.063 13.520 13.188 12.057 ~ 18 0
23 Cl* Trumpler 20 PMF 4260 HB* 12 39 12.0124772160 -60 36 32.167665396 15.683 16.022 14.690   13.436 ~ 20 0
24 Cl* Trumpler 20 PMF 5058 * 12 39 15.7725063000 -60 34 40.597485348 15.595 16.000 14.669   13.400 ~ 21 0
25 Cl Trumpler 20 OpC 12 39 31.7 -60 38 13           ~ 112 0
26 Cl* Trumpler 20 PMF 4098 * 12 40 04.5087830064 -60 36 56.582531640 15.337 15.358 13.690   12.126 ~ 19 0
27 NGC 5822 OpC 15 04 12.2 -54 21 58           ~ 208 0
28 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1856 0
29 ClG 1710-2507 ClG 17 13 39 -25 11.1           ~ 16 0
30 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1979 0
31 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
32 M 20 OpC 18 02 42 -22 58.3           ~ 434 1
33 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1381 0
34 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2195 2
35 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2004 0
36 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 429 0
37 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1050 0
38 NAME Helmi Stream St* ~ ~           ~ 80 0
39 NAME Galactic Bulge reg ~ ~           ~ 4309 0
40 NAME Local Group GrG ~ ~           ~ 8415 0

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