2021A&A...648A..70F


Query : 2021A&A...648A..70F

2021A&A...648A..70F - Astronomy and Astrophysics, volume 648A, 70-70 (2021/4-1)

APOGEE spectroscopic evidence for chemical anomalies in dwarf galaxies: The case of M 54 and Sagittarius.

FERNANDEZ-TRINCADO J.G., BEERS T.C., MINNITI D., MONI BIDIN C., BARBUY B., VILLANOVA S., GEISLER D., LANE R.R., ROMAN-LOPES A. and BIZYAEV D.

Abstract (from CDS):

We present evidence for globular cluster stellar debris in a dwarf galaxy system (Sagittarius; Sgr) based on an analysis of high-resolution H-band spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. We add [N/Fe], [Ti/Fe], and [Ni/Fe] abundance ratios to the existing sample of potential members of M 54; this is the first time that [N/Fe] abundances are derived for a large number of stars in M 54. Our study reveals the existence of a significant population of nitrogen- (with a large spread, ≥1dex) and aluminum-enriched stars with moderate Mg depletions in the core of the M 54+Sgr system, which share the light element anomalies characteristic of second-generation globular cluster stars (GC), thus tracing the typical phenomenon of multiple stellar populations seen in other Galactic GCs at similar metallicity, confirming earlier results based on the Na-O anti-correlation. We further show that most of the stars in M 54 exhibit different chemical patterns evidently not present in Sgr field stars. Furthermore, we report the serendipitous discovery of a nitrogen-enhanced extra-tidal star that has GC second-generation-like chemical patterns for which both chemical and kinematic evidence are commensurate with the hypothesis that the star has been ejected from M 54. Our findings support the existence of chemical anomalies associated with likely tidally shredded GCs that are in dwarf galaxies in the Local Group. These findings motivate future searches for such bona fide stars along other known Milky Way streams.

Abstract Copyright: © ESO 2021

Journal keyword(s): stars: abundances - stars: chemically peculiar - globular clusters: individual: M 54 - techniques: spectroscopic

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 138 0
2 NAME Sagittarius Stream St* 02 22 +00.0           ~ 801 0
3 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 896 0
4 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 549 0
5 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 754 0
6 NGC 6534 G 17 56 08.5680428976 +64 17 01.506140628   15.5       ~ 17 0
7 2MASS J18533777-3129187 * 18 53 37.7746848120 -31 29 18.803413356           ~ 1 0
8 2MASS J18544275-3029012 Pe* 18 54 42.7644748872 -30 29 01.236835968           ~ 9 0
9 2MASS J18544848-3031588 Pe* 18 54 48.4920069624 -30 31 58.808741232           ~ 4 0
10 2MASS J18545303-3024220 * 18 54 53.0411220528 -30 24 22.014077112           ~ 3 0
11 2MASS J18545434-3028458 Pe* 18 54 54.3476007480 -30 28 45.872625828           ~ 4 0
12 2MASS J18545470-3027044 RG* 18 54 54.7073400384 -30 27 04.443839928   16.692 15.176   13.542 ~ 5 0
13 Cl* NGC 6715 SAW V156 RG* 18 54 57.7469224560 -30 25 57.398777364   17.010 15.297   13.613 ~ 5 0
14 2MASS J18545920-3028403 RG* 18 54 59.2060062168 -30 28 40.284262776   16.892 15.422   13.890 ~ 6 0
15 2MASS J18550076-3034068 RG* 18 55 00.7672003608 -30 34 06.871639332   17.099 15.815   14.422 ~ 5 0
16 2MASS J18550247-3031314 Pe* 18 55 02.4768786000 -30 31 31.446271920           ~ 4 0
17 2MASS J18550293-3029523 Pe* 18 55 02.93400 -30 29 52.3788           ~ 3 0
18 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 2038 2
19 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1018 0
20 2MASS J18550560-3026332 RG* 18 55 05.6040842328 -30 26 33.179950140   17.635 16.315   15.021 ~ 5 0
21 2MASS J18550623-3030561 RG* 18 55 06.2326710648 -30 30 56.154587184   17.348 16.029   14.627 ~ 6 0
22 2MASS J18550740-3026052 Pe* 18 55 07.4114947512 -30 26 05.188002972           ~ 8 0
23 2MASS J18550843-3029045 Pe* 18 55 08.43000 -30 29 04.5528           ~ 4 0
24 2MASS J18551026-3033406 RG* 18 55 10.2593393208 -30 33 40.643696160   17.148 15.089   13.370 ~ 5 0
25 2MASS J18551034-3027105 RG* 18 55 10.3420140960 -30 27 10.510036632   17.257 15.903   14.454 ~ 5 0
26 2MASS J18551061-3029597 RG* 18 55 10.610 -30 29 59.71   17.766 16.481   15.161 ~ 5 0
27 2MASS J18551152-3025352 * 18 55 11.52432 -30 25 35.2092           ~ 3 0
28 2MASS J18551416-3028548 RG* 18 55 14.1655962096 -30 28 54.783742188   17.016 15.503   13.942 ~ 5 0
29 2MASS J18551535-3024142 Pe* 18 55 15.3577775904 -30 24 14.247472680           ~ 3 0
30 2MASS J18551672-3027508 RG* 18 55 16.7280523992 -30 27 50.878585800   17.459 16.154   14.870 ~ 6 0
31 2MASS J18552982-3028545 RG* 18 55 29.8300570416 -30 28 54.536265912   17.111 15.618   14.098 ~ 5 0
32 2MASS J18565969-3106454 Pe* 18 56 59.6899498608 -31 06 45.384569136           ~ 3 0
33 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 407 0
34 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 338 0
35 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 301 0
36 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 500 0
37 NAME Local Group GrG ~ ~           ~ 7904 0

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2023.02.04-10:00:26

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