J/ApJ/926/154 Cerium abundances in open clusters from OCCAM (Sales-Silva+, 2022)
Exploring the s-process history in the Galactic disk: Cerium abundances and
gradients in open clusters from the OCCAM/APOGEE sample.
Sales-Silva J.V., Daflon S., Cunha K., Souto D., Smith V.V., Chiappini C.,
Donor J., Frinchaboy P.M., Garcia-Hernandez D.A., Hayes C., Majewski S.R.,
Masseron T., Schiavon R.P., Weinberg D.H., Beaton R.L.,
Fernandez-Trincado J.G., Jonsson H., Lane R.R., Minniti D., Manchado A.,
Moni Bidin C., Nitschelm C., O'Connell J., Villanova S.
<Astrophys. J., 926, 154 (2022)>
=2022ApJ...926..154S 2022ApJ...926..154S
ADC_Keywords: Abundances; Spectra, infrared; Clusters, open; Milky Way
Keywords: Galaxy evolution ; Galaxy abundances ; Milky Way disk ;
Open star clusters ; S-process
Abstract:
The APOGEE Open Cluster Chemical Abundances and Mapping survey is used
to probe the chemical evolution of the s-process element cerium in the
Galactic disk. Cerium abundances were derived from measurements of
CeII lines in the APOGEE spectra using the Brussels Automatic Code for
Characterizing High Accuracy Spectra in 218 stars belonging to 42 open
clusters. Our results indicate that, in general, for ages <4Gyr,
younger open clusters have higher [Ce/Fe] and [Ce/α-element]
ratios than older clusters. In addition, metallicity segregates open
clusters in the [Ce/X]-age plane (where X can be H, Fe, or the
α-elements O, Mg, Si, or Ca). These metallicity-dependent
relations result in [Ce/Fe] and [Ce/α] ratios with ages that are
not universal clocks. Radial gradients of [Ce/H] and [Ce/Fe] ratios in
open clusters, binned by age, were derived for the first time, with
d[Ce/H]/dRGC being negative, while d[Ce/Fe]/dRGC is positive. [Ce/H]
and [Ce/Fe] gradients are approximately constant over time, with the
[Ce/Fe] gradient becoming slightly steeper, changing by
~+0.009dex/kpc/Gyr. Both the [Ce/H] and [Ce/Fe] gradients are shifted
to lower values of [Ce/H] and [Ce/Fe] for older open clusters. The
chemical pattern of Ce in open clusters across the Galactic disk is
discussed within the context of s-process yields from asymptotic giant
branch (AGB) stars, gigayear time delays in Ce enrichment of the
interstellar medium, and the strong dependence of Ce nucleosynthesis
on the metallicity of its AGB stellar sources.
Description:
APOGEE is a high-resolution, near-infrared (1.514-1.696um)
spectroscopic survey. The APOGEE observations are made with the 2.5m
telescopes at Apache Point Observatory (New Mexico, USA) and at Las
Campanas Observatory (La Serena, Chile).
The Open Cluster Chemical Abundances and Mapping (OCCAM) survey
(Donor+ 2020, J/AJ/159/199) used the atmospheric parameters and
chemical abundances from APOGEE DR16.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 42 Cluster parameters and abundance ratios used
in this study
table4.dat 103 218 Line-by-line Ce abundances and atmospheric
parameters (Teff, logg, ξ and [Fe/H]) for
all cluster stars
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See also:
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/ApJ/696/797 : Evolution & yields of low-mass AGB stars (Cristallo+, 2009)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/AJ/144/95 : Abundance in stars of the outer gal. disk. IV. (Yong+, 2012)
J/AJ/145/107 : Zr, Ba, La & Eu abund. in 19 open clusters (Jacobson+, 2013)
J/A+A/558/A53 : MW global survey of star clusters. II. (Kharchenko+, 2013)
J/A+A/552/A128 : Abundances of neutron-capture elements (Mishenina+, 2013)
J/MNRAS/431/3338 : Abundances of red giants in open clusters (Reddy+, 2013)
J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)
J/ApJ/787/10 : Solar s-process with GCE model (Bisterzo+, 2014)
J/A+A/586/A49 : r- & s- process elements in MW disk (Battistini+, 2016)
J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)
J/ApJ/854/184 : Abundances of stars in 3 open clusters (Pena Suarez+, 2018)
J/MNRAS/474/2580 : Evolution of neutron-capture elements (Spina+, 2018)
J/A+A/624/A78 : Masses & ages of 1059 HARPS-GTO stars (Delgado Mena+, 2019)
J/MNRAS/487/1057 : Massive SFR beyond the solar circle (Djordjevic+, 2019)
J/A+A/631/A113 : Abundances of disk & bulge giants (Forsberg+, 2019)
J/ApJ/874/97 : Abundances from APOGEE. II. M67 stars (Souto+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/A+A/639/A127 : Age-chemical-clocks-metallicity relations (Casali+, 2020)
J/AJ/159/199 : OCCAM. IV. Open cluster abund. from APOGEE (Donor+, 2020)
J/A+A/633/L9 : Linear regression fit coefficients (Jofre+, 2020)
J/ApJ/895/52 : EW and abundances in 211 stars with HARPS (Spina+, 2020)
J/A+A/652/A25 : Abundance-age relations with open cl. (Casamiquela+, 2021)
J/A+A/645/A85 : Age dissection of the Milky Way discs (Miglio+, 2021)
J/MNRAS/503/3279 : GALAH survey. Gal. disc with open clusters (Spina+, 2021)
J/A+A/649/A126 : Abundances of neutron-capture elements (Tautvaisiene+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cl Cluster name
15- 18 F4.2 [yr] logAge [8.1/9.9] Log of age (1)
20- 25 F6.3 kpc RGC [6/20.6] Galactocentric distance (1)
27- 28 I2 --- Ns [1/30] Number of stars
30- 35 F6.3 [Sun] [Fe/H] [-0.47/0.36] Metallicity (1)
37- 41 F5.3 [Sun] e_[Fe/H] [0.003/0.04]? [Fe/H] uncertainty
43- 47 F5.3 --- ACe [1.38/2.1] Mean Ce abundance obtained in our
study using BACCHUS
49- 53 F5.3 --- e_ACe [0.014/0.09]? ACe uncertainty
55- 60 F6.3 [Sun] [Ce/H] [-0.32/0.38] Log of Ce/H abundance
62- 66 F5.3 [Sun] [Ce/Fe] [0.002/0.44] Log of Ce/Fe abundance
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Note (1): The galactocentric distance and age of the open clusters were
obtained from Cantat-Gaudin+ (2020, J/A+A/640/A1). We used APOGEE DR16
values to determine the average metallicity for each cluster.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cl Cluster name
15- 32 A18 --- Name APOGEE identifier (2MHHMMSSss+DDMMSSs)
34- 37 I4 --- S/N [41/1137] Signal-to-noise ratio of the spectra
39- 42 I4 K Teff [4014/4999] Effective temperature
44- 47 F4.2 [cm/s2] logg [1.66/3.54] Log of surface gravity
49- 52 F4.2 km/s xi [0.7/1.51] Microturbulent velocity
54- 58 F5.2 [Sun] [Fe/H] [-0.51/0.41] Metallicity
60- 63 F4.2 --- Ce15277 [1.32/2.16]? 15277.6Å CeII absorption line
65- 68 F4.2 --- Ce15784 [1.38/2.23]? 15784.8Å CeII absorption line
70- 73 F4.2 --- Ce15977 [1.31/2.21]? 15977.1Å CeII absorption line
75- 78 F4.2 --- Ce16327 [1.51/2.15]? 16327.3Å CeII absorption line
80- 83 F4.2 --- Ce16376 [1.36/2.15]? 16376.5Å CeII absorption line
85- 88 F4.2 --- Ce16595 [1.33/2.25]? 16595.2Å CeII absorption line
90- 93 F4.2 --- Ce16722 [1.54/2.23]? 16722.6Å CeII absorption line
95- 98 F4.2 --- ACe [1.32/2.19] Ce abundance, <A(Ce)>
100- 103 F4.2 --- e_ACe [0/0.25]? 1σ ACe uncertainty
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 31-Oct-2023