J/A+A/703/A267 CAPOS member stars in 18 globular clusters (Geisler+, 2025)
CAPOS: The bulge Cluster APOgee Survey.
VIII. Final ASPCAP results for all clusters.
Geisler D., Munoz C., Villanova S., Cohen R.E., Minniti D., Monachesi A.,
Majewski S.R., Kunder A., Barbuy B., Cunha K., Smith V., Montecinos C.,
Haro Moya W., Barrera N., Blana M.
<Astron. Astrophys. 703, A267 (2025)>
=2025A&A...703A.267G 2025A&A...703A.267G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Populations, stellar ; Infrared sources
Keywords: stars: abundances - galaxy: bulge - globular clusters: general
Abstract:
Bulge globular clusters (BGCs) are exceptional tracers of the
formation and chemodynamical evolution of this oldest Galactic
component. However, until now, observational difficulties have
prevented us from taking full advantage of these powerful Galactic
archeological tools.
CAPOS, the bulge Cluster APOgee Survey, addresses this key topic by
observing a large number of BGCs, most of which have only been poorly
studied previously. We aim to obtain accurate mean values for
metallicity, [α/Fe], and radial velocity, as well as abundances
for eleven other elements. Here we present final parameters for all 18
CAPOS BGCs.
We use atmospheric parameters, abundances and velocities from ASPCAP
in DR17.
First, we carry out a stringent selection of cluster members, finding
a total of 295 having spectral SNR>70. We reinforced the finding that
stars with high [N/Fe] abundances show higher [Fe/H] than their lower
[N/Fe] counterparts. Mg, Ca and global α abundances show similar
trends, while Si is well-behaved. The [Fe/H] value of these 2nd
population stars is corrected to derive the mean metallicity. Mean
metallicities are determined to a precision of 0.05dex, [α/Fe]
to 0.06dex, and radial velocity to 3.4km/s. No clusters show strong
evidence for internal metallicity variations. Abundances for eleven
other elements using only 1st population stars are calculated. Our
values are generally in good agreement with the literature. We
developed a new chemodynamical GC classification scheme, synthesizing
recent studies. We also compile up-to-date metallicities. The BGC
metallicity distribution is bimodal, with peaks near [Fe/H]=-0.45 and
-1.1, with the metal-poor peak strongly dominant. The entire in situ
sample, including Disk and BGCs, shows the same bimodality, while ex
situ GCs are unimodal, with a peak around -1.6. Surprisingly, we find
a negligible difference in the mean [Si/Fe] of in and ex situ GCs.
Description:
This file lists 428 stars identified as high-probability members of 18
different globular clusters observed as part of the CAPOS (CArina
Project On Star clusters) survey. Each entry includes the name of the
cluster, the APOGEE DR17 identifier, and equatorial coordinates (RA,
Dec) in degrees.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
capos-id.dat 48 428 CAPOS member stars in 18 globular clusters
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See also:
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
https://www.sdss.org/dr17/irspec : APOGEE Home Page
Byte-by-byte Description of file: capos-id.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Name of the globular cluster (1)
9- 26 A18 --- ApogeeID APOGEE DR17 star identifier (2MHHMMSSss+DDMMSSs)
28- 37 F10.6 deg RAdeg Right Ascension (J2000)
39- 48 F10.6 deg DEdeg Declination (J2000)
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Note (1): Clusters are Djorg_2, FSR1758, HP1, NGC6273, NGC6293, NGC6304,
NGC6316, NGC6380, NGC6540, NGC6558, NGC6569, NGC6642, NGC6656, NGC6717,
Ter2, Ter4, Ter9 and Ton2
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History:
From Cesar Munoz, cesar.alejandro.munoz.g(at)gmail.com
Acknowledgements:
This dataset is part of the CAPOS project led by Doug Geisler.
References:
Majewski et al., 2017AJ....154...94M 2017AJ....154...94M, Cat. III/284
Abdurro'uf et al., 2022ApJS..259...35A 2022ApJS..259...35A, Cat. III/284
Geisler, et al., Paper I 2021A&A...652A.157G 2021A&A...652A.157G
Romero-Colmenares et al. Paper II 2021A&A...652A.158R 2021A&A...652A.158R
Fernandez-Trincado et al., Paper III 2022A&A...658A.116F 2022A&A...658A.116F
Gonzalez-Diaz et al., Paper IV 2023MNRAS.526.6274G 2023MNRAS.526.6274G
Henao et al., Paper V 2025A&A...696A.154H 2025A&A...696A.154H
Barrera et al., Paper VI 2025A&A...699A.128B 2025A&A...699A.128B
Frelijj et al., Paper VII 2025arXiv250218607F 2025arXiv250218607F
(End) Patricia Vannier [CDS] 23-Jul-2025