J/A+A/699/A41 n-capture element abundances (Schiappacasse-Ulloa+, 2025)
Neutron-capture element signatures in globular clusters.
Insights from the Gaia-ESO Survey.
Schiappacasse-Ulloa J., Magrini L., Lucatello S., Randich S., Bragaglia A.,
Carretta E., Cescutti G., Rizzuti F., Worley C., Lucertini F., Berni L.
<Astron. Astrophys. 699, A41 (2025)>
=2025A&A...699A..41S 2025A&A...699A..41S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Abundances ; Stars, population II ;
Optical
Keywords: stars: abundances - stars: Population II - globular clusters: general
Abstract:
Globular clusters (GCs) are key to understanding the formation and
evolution of our Galaxy. While the abundances of light and Fe-peak
elements in GCs have been widely studied, investigations into heavier,
neutron-capture elements -- and their connection to multiple stellar
populations and GC origins -- remain limited. In this work, we
analysed the chemical abundances of neutron-capture elements in GCs to
trace the Galactic halo and to explore possible links to the MP
phenomenon. Our goal is to better constrain the nature of the
polluters responsible for intracluster enrichment and to distinguish
the origin of GCs through the chemical signature of neutron-capture
elements. We examined 14 GCs from the Gaia-ESO Survey, spanning a wide
metallicity range, [Fe/H] from -0.40 to -2.32, using a homogeneous
methodology. We focused on the abundances of Y, Zr, Ba, La, Ce, Nd,
Pr, and Eu, derived from FLAMES-UVES spectra. These were compared with
predictions from a stochastic Galactic chemical evolution model. With
the exception of Zr, the model broadly reproduces the observed trends
in neutron-capture elements. In some GCs, we found strong correlations
between hot H-burning products (Na, Al) and s-process elements,
pointing to a shared nucleosynthesis site, e.g., asymptotic giant
branch stars of different masses and/or fast-rotating massive stars.
We also detect a distinct difference in [Eu/Mg] ratio between in-situ
(<[Eu/Mg]≥0.14dex) and ex-situ (<[Eu/Mg]≥0.32dex) GCs,
highlighting their different enrichment histories. Finally, on
average, Type II GCs (NGC 362, NGC 1261, and NGC 1851) showed a
s-process element spread ratio between second- and first-generations
about twice as large as those seen in Type I clusters.
Description:
The Table display the corrected abundances of the neutron-capture
elements derived in the present article for each globular cluster of
our sample. The Table also reports for each star member of the
globular clusters, the stellar parameters and the [Na/Fe] and [Al/Fe]
derived by the Gaia-ESO Survey.
We utilised data from the DR5.1 release of the Gaia-ESO Survey
(https://www.eso.org/qi/catalog/show/411), which were obtained through
spectral analysis of UVES spectra (with a resolving power of R=47000
and a spectral range of 480.0-680.0nm).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
abund.dat 180 236 Corrected abundance for each globular cluster
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See also:
J/A+A/676/A129 : Gaia-ESO catalogue version 5.1 (Hourihane+, 2023)
Byte-by-byte Description of file: abund.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Object GES name (HHMMSSss+DDMMSSs)
18- 36 I19 --- GaiaEDR3 ID in Gaia eDR3
38- 46 F9.5 deg RAdeg Right Ascension (J2000)
48- 56 F9.5 deg DEdeg Declination (J2000)
58- 61 I4 K Teff Effective Temperature
63- 66 F4.2 [cm/s2] logg Surface gravity
68- 72 F5.2 [Sun] [Fe/H] Metallicity [Fe/H]
74- 77 F4.2 km/s Vt ? Microturbulence Velocity
79-101 E23.17 [Sun] [Na/Fe] ? Abundacne [Na/Fe] from Gaia-ESO Survey
103-124 F22.19 [Sun] [Al/Fe] ? Abundance [Al/Fe] from Gaia-ESO Survey
126-130 F5.2 --- d[Y/Fe] ? Delta [Y/Fe] value
132-136 F5.2 --- d[Zr/Fe] ? Delta [Zr/Fe] value
138-142 F5.2 --- d[Ba/Fe] ? Delta [Ba/Fe] value
144-148 F5.2 --- d[La/Fe] ? Delta [La/Fe] value
150-154 F5.2 --- d[Ce/Fe] ? Delta [Ce/Fe] value
156-160 F5.2 --- d[Pr/Fe] ? Delta [Pr/Fe] value
162-166 F5.2 --- d[Nd/Fe] ? Delta [Nd/Fe] value
168-172 F5.2 --- d[Eu/Fe] ? Delta [Eu/Fe] value
174-180 A7 --- Cluster Cluster name
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Acknowledgements:
Jose Schiappacasse-Ulloa, jose.schiappacasse(at)inaf.it
(End) Jose Schiappacasse-Ulloa [INAF-OOA], Patricia Vannier [CDS] 20-May-2025