2022A&A...657A..84F


Query : 2022A&A...657A..84F

2022A&A...657A..84F - Astronomy and Astrophysics, volume 657A, 84-84 (2022/1-1)

APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy.

FERNANDEZ-TRINCADO J.G., MINNITI D., GARRO E.R. and VILLANOVA S.

Abstract (from CDS):

We present detailed elemental abundances, radial velocity, and orbital elements for Patchick 125, a recently discovered metal-poor globular cluster (GC) in the direction of the Galactic bulge. Near-infrared high-resolution (R ∼ 22500) spectra of two members were obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment at Las Campanas Observatory as part of the sixteenth Data Release (DR 16) of the Sloan Digital Sky Survey. We investigated elemental abundances for four chemical species, including α- (Mg, Si), Fe-peak (Fe), and odd-Z (Al) elements. We find a metallicity covering the range from [Fe/H] = -1.69 to -1.72, suggesting that Patchick 125 likely exhibits a mean metallicity <[Fe/H]> ∼ -1.7, which represents a significant increase in metallicity for this cluster compared to previous low-resolution spectroscopic analyses. We also found a mean radial velocity of 95.9 km/s, which is ∼21.6 km/s higher than reported in the literature. The observed stars exhibit an α-enrichment ([Mg/Fe] ≥ 0.20, and [Si/Fe] ≥ +0.30) that follows the typical trend of metal-poor GCs. The aluminum abundance ratios for the present two member stars are enhanced in [Al/Fe] ≥ +0.58, which is a typical enrichment characteristic of the so-called 'second-generation' of stars in GCs at similar metallicity. This supports the possible presence of the multiple-population phenomenon in Patchick 125, as well as its genuine GC nature. Further, Patchick 125 shows a low-energy, low-eccentric (< 0.4) and retrograde orbit captured by the inner Galaxy, near the edge of the bulge. We confirm that Patchick 125 is a genuine metal-poor GC, which is currently trapped in the vicinity of the Milky Way bulge.

Abstract Copyright: © ESO 2022

Journal keyword(s): stars: abundances - globular clusters: individual: Patchick 125 - techniques: spectroscopic

Simbad objects: 9

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Number of rows : 9
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 Gaia DR2 5977223144516980608 RR* 17 04 55.0811888928 -35 30 24.076410768           ~ 3 0
2 Patchick 125 Cl* 17 05 00.7 -35 29 41           ~ 3 0
3 Gaia DR2 5977224553266268928 RR* 17 05 05.2027067424 -35 28 43.775573124           ~ 3 0
4 NGC 6330 rG 17 15 44.4122166936 +29 24 15.560182296   14.80       ~ 37 1
5 NGC 6380 GlC 17 34 28.00 -39 04 09.0           ~ 123 0
6 NAME UKS 1 GlC 17 54 27.20 -24 08 43.0           ~ 84 0
7 VVV CL001 Gl? 17 54 42.5 -24 00 53           ~ 23 0
8 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 821 0
9 NAME Galactic Bulge reg ~ ~           ~ 4012 0

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2023.01.31-00:51:28

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