J/AJ/163/195 Open Cluster Chemical Abundances and Mapping Survey.V. (Ray+, 2022)
The Open Cluster Chemical Abundances and Mapping Survey.
V. Chemical Abundances of CTIO/Hydra Clusters Using The Cannon.
Ray A.E., Frinchaboy P.M., Donor J., Chojnowski S.D., Melendez M.
<Astron. J., 163, 195 (2022)>
=2022AJ....163..195R 2022AJ....163..195R
ADC_Keywords: Clusters, open; Effective temperatures; Abundances;
Spectra, optical
Keywords: Open star clusters ; Galactic abundances ; Milky Way evolution
; Chemical abundances
Abstract:
Open clusters are key chemical and age tracers of Milky Way evolution.
While open clusters provide significant constraints on galaxy
evolution, their use has been limited due to discrepancies in
measuring abundances from different studies. We analyze
medium-resolution (R∼19000) Cerro Tololo Inter-American
Observatory/Hydra spectra of giant stars in 58 open clusters using The
Cannon to determine [Fe/H], [Mg/Fe], [Si/Fe], [Al/Fe], and [O/Fe].
This work adds an additional 55 primarily southern hemisphere open
clusters calibrated to the Sloan Digital Sky Survey/Apache Point
Observatory Galactic Evolution Experiment DR16 metallicity system.
This uniform analysis is compared to previous studies [Fe/H]
measurements for 23 clusters and we present spectroscopic
metallicities for the first time for 35 open clusters.
Description:
The primary data for this study comes from optical data near the
calcium infrared triplet (7745-8730Å) taken with the Hydra
spectrograph using the Cerro Tololo Inter-American Observatory (CTIO)
4m telescope. Data was observed on UT 2002 March, 2003 March, 2003
July, and 2003 August.
We have chosen to train The Cannon using data from the Sloan Digital
Sky Survey's (SDSS DR16) taken as part of APOGEE2. The APOGEE/DR16
data set includes about 430000 stars, collected using two APOGEE
spectrographs at Apache Point Observatory (APO) and Las Campanas
Observatory (LCO).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 390 APOGEE DR16 training set parameters
table3.dat 99 237 The Cannon results star results for all clusters
table4.dat 78 58 The Cannon-based cluster parameters
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/A+A/480/79 : Abundances of giants in 5 Galactic clusters (Bragaglia+, 2008)
J/AJ/136/118 : Open clusters as galactic disk tracers. I. (Frinchaboy+, 2008)
J/A+A/489/403 : Line abundances for solar stars (Pace+, 2008)
J/AJ/137/4753 : Red giants equivalent widths 4 open clusters (Jacobson+, 2009)
J/AJ/139/1942 : Equivalent widths of red giants 6 open clusters (Friel+, 2010)
J/A+A/515/A28 : Abundances of dwarfs and giants 2 open clusters (Pace+, 2010)
J/A+A/535/A30 : Chemical abundance of 12 stars open clusters (Carrera+, 2011)
J/ApJ/756/74 : 2MASS view of Sgr dSph. VII. Kinematics (Frinchaboy+, 2012)
J/MNRAS/422/3527 : Equivalent widths of 11 NGC 3680 stars (Mitschang+, 2012)
J/AJ/144/95 : Abundance in stars of outer galactic disk. IV. (Yong+, 2012)
J/MNRAS/431/3338 : Abundances of red giants in open clusters (Reddy+, 2013)
J/A+A/578/A27 : RV and [Fe/H] in 5 open clusters (Carrera+, 2015)
J/MNRAS/453/106 : NGC5617 and Trumpler 22 stars BV mag and RV (De Silva+, 2015)
J/ApJ/808/16 : The Cannon a new approach to determine abundances (Ness+, 2015)
J/MNRAS/450/4301 : Line list for red giants in open clusters (Reddy+, 2015)
J/AJ/151/144 : ASPCAP weights for 15 APOGEE chemical elements (Garcia+, 2016)
J/AJ/151/49 : M6 open cluster; star members properties (Kilicoglu+, 2016)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
J/MNRAS/469/1330 : NGC 6067 stars (Alonso-Santiago+, 2017)
J/ApJ/836/5 : Abundances of LAMOST giants from APOGEE DR12 (Ho+, 2017)
J/A+A/603/A2 : Gaia-ESO Survey abundances radial distribution (Magrini+, 2017)
J/A+A/615/A165 : Equivalent widths of 13 red giants in IC4756 (Bagdonas+, 2018)
J/AJ/156/142 : Precision cluster abund. for APOGEE SDSS DR14 (Donor+, 2018)
J/ApJ/854/184 : Abundances of stars in 3 open clusters (Pena Suarez+, 2018)
J/MNRAS/490/1821 : Abundances for stars 18 open clusters (Casamiquela+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/AJ/159/199 : OCCAM. IV. Open cluster abund. using APOGEE DR16 (Donor+, 2020)
J/ApJ/901/109 : Ages & [Fe/H] of the MW bulge using APOGEE (Hasselquist+, 2020)
J/AJ/159/220 : WOCS LXXIX. M48. I. WIYN/Hydra spectra M48 stars (Sun+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- 2MASS 2MASS identifier
20- 23 F4.1 /pix S/N [0.9/73.6] Signal-to-Noise
25- 28 I4 K Teff [3523/5011] APOGEE DR16 Effective temperature
30- 36 F7.4 [cm/s2] logg [-0.44/3.4] APOGEE DR16 log surface gravity
38- 44 F7.4 [Sun] [Fe/H] [-1.72/0.4] APOGEE DR16 Iron/Hydrogen abundance
46- 52 F7.4 [Sun] [Si/Fe] [-0.32/0.53] APOGEE DR16 Silicon/Iron abundance
54- 60 F7.4 [Sun] [Al/Fe] [-0.84/1.49] APOGEE DR16 Aluminum/Iron abundance
62- 68 F7.4 [Sun] [Mg/Fe] [-0.34/0.44] APOGEE DR16 Magnesium/Iron abundance
70- 76 F7.4 [Sun] [O/Fe] [-0.21/0.46] APOGEE DR16 Oxygen/Iron abundance
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Cluster Cluster name
16- 33 A18 --- 2MASS 2MASS identifier
35- 40 F6.1 /pix S/N [8.2/223] Signal-to-Noise
42- 46 I5 K Teff [4524/5007] Effective temperature
48- 54 F7.4 [cm/s2] logg [1.97/3.08] log surface gravity
56- 63 F8.4 [Sun] [Fe/H] [-0.19/0.21] Iron to Hydrogen abundance
65- 72 F8.4 [Sun] [Si/Fe] [-0.04/0.08] Silicon to Iron abundance
74- 81 F8.4 [Sun] [Al/Fe] [-0.17/0.06] Aluminum to Iron abundance
83- 90 F8.4 [Sun] [Mg/Fe] [-0.06/0.09] Magnesium to Iron abundance
92- 99 F8.4 [Sun] [O/Fe] [-0.05/0.06] Oxygen to Iron abundance
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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 --- Cluster Cluster name
15- 16 I2 --- Nstar [1/19] Number of Stars
18- 21 F4.2 [yr] Age [6.66/9.63]? Logarithmic cluster age (1)
23- 27 F5.2 [Sun] [Fe/H] [-0.16/0.19] Cluster average Iron/Hydrogen
abundance
29- 32 F4.2 [Sun] e_[Fe/H] [0.06/0.3] Uncertainty in [Fe/H]
34- 38 F5.2 [Sun] [Si/Fe] [-0.02/0.07] Cluster average Silicon/Iron
abundance
40- 43 F4.2 [Sun] e_[Si/Fe] [0.02/0.09] Uncertainty in [Si/Fe]
45- 49 F5.2 [Sun] [Al/Fe] [-0.17/0.06] Cluster average Aluminum/Iron
abundance
51- 54 F4.2 [Sun] e_[Al/Fe] [0.04/0.2] Uncertainty in [Al/Fe]
56- 60 F5.2 [Sun] [Mg/Fe] [-0.05/0.05] Cluster average Magnesium/Iron
abundance
62- 65 F4.2 [Sun] e_[Mg/Fe] [0.02/0.1] Uncertainty in [Mg/Fe]
67- 71 F5.2 [Sun] [O/Fe] [-0.03/0.04] Cluster average Oxygen/abundance
73- 76 F4.2 [Sun] e_[O/Fe] [0.02/0.07] Uncertainty in [O/Fe]
78- 78 A1 --- New New measured cluster (2)
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Note (1): Cluster ages are taken from Cantat-Gaudin+, 2020, J/A+A/640/A1.
Note (2): Codes as follows:
Y = Cluster without previously published spectroscopic [Fe/H], new
in this work (12 occurrences)
N = Cluster with previously published spectroscopic [Fe/H] (43 occurrences)
T = training set cluster with APOGEE DR16 stars (V/154) (3 occurrences)
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History:
From electronic version of the journal
References:
Donor et al. Paper II: 2018AJ....156..142D 2018AJ....156..142D Cat. J/AJ/156/142
Donor et al. Paper IV: 2020AJ....159..199D 2020AJ....159..199D Cat. J/AJ/159/199
Spoo et al. Paper VII: 2022AJ....163..229S 2022AJ....163..229S
(End) Prepared by [AAS], Coralie Fix [CDS], 08-Aug-2022