J/A+A/622/A191        885 globular cluster giants abundances   (Masseron+, 2019)

Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code. I. The northern clusters. Masseron T., Garcia-Hernandez D.A., Meszaros S., Zamora O., Dell'Agli F., Allende Prieto C., Edvardsson B., Shetrone M., Plez B., Fernandez-Trincado J.G., Cunha K., Jonsson H., Geisler D., Beers T.C., Cohen R.E. <Astron. Astrophys. 622, A191 (2019)> =2019A&A...622A.191M 2019A&A...622A.191M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Abundances Keywords: stars: abundances - globular clusters: general Abstract: We seek to provide abundances of a large set of light and neutron-capture elements homogeneously analyzed that cover a wide range of metallicity to constrain globular cluster (GC) formation and evolution models. We analyzed a large sample of 885 GCs giants from the SDSS∼IV-Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. We used the Cannon results to separate the red giant branch and asymptotic giant branch stars, not only allowing for a refinement of surface gravity from isochrones, but also providing an independent H-band spectroscopic method to distinguish stellar evolutionary status in clusters. We then used the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS) to derive metallicity, microturbulence, macroturbulence, many light-element abundances, and the neutron-capture elements Nd and Ce for the first time from the APOGEE GCs data. Our independent analysis helped us to diagnose issues regarding the standard analysis of the APOGEE DR14 for low-metallicity GC stars. Furthermore, while we confirm most of the known correlations and anticorrelation trends (Na-O, Mg-Al, C-N), we discover that some stars within our most metal-poor clusters show an extreme Mg depletion and some Si enhancement. At the same time, these stars show some relative Al depletion, displaying a turnover in the Mg-Al diagram. These stars suggest that Al has been partially depleted in their progenitors by very hot proton-capture nucleosynthetic processes. Furthermore, we attempted to quantitatively correlate the spread of Al abundances with the global properties of GCs. We find an anticorrelation of the Al spread against clusters metallicity and luminosity, but the data do not allow us to find clear evidence of a dependence of N against metallicity in the more metal-poor clusters. Large and homogeneously analyzed samples from ongoing spectroscopic surveys unveil unseen chemical details for many clusters, including a turnover in the Mg-Al anticorrelation, thus yielding new constrains for GCs formation/evolution models. Description: We investigated the abundances of ten elements (C, N, O, Mg, Al, Si, K, and Ca, Ce and Nd), for 885 stars in 10 globular clusters (NGC 7078, NGC 6341, NGC 5024, NGC 5466, NGC 6205, NGC 7089, NGC 5272, NGC 5904, NGC 6171, and NGC 6838) using Apache Point Observatory Galactic Evolution Experiment (APOGEE; Majewski et al. 2015, Cat. J/AJ/149/7) DR14 spectra. We make use of photometry and theoretical isochrones to constrain the effective temperature (Teff) and surface gravity log(g) and the stellar evolutionnary status (RGB, HB, or early AGB). The abundances are derived by line fitting with the automatic code BACCHUS (Masseron, Merle & Hawkins, 2016ascl.soft05004M), which uses MARCS model atmospheres andf the APOGEE DR14 atomic and molecular linelists. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 227 885 Stellar parameters and abundances for the 885 globular clusters stars -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 A2 --- --- [2M] 3- 18 A16 --- 2MASS Star 2MASS identifier (HHMMSSss+DDMMSSs, J2000) 20- 24 A5 --- Cluster Cluster name 26- 29 A4 --- Evol Stellar evolutionary status (RGB, HB or eAGB) 31- 34 I4 K Teff Photometric effective temperature 36- 40 F5.2 [cm/s2] logg Log surface gravity; from isochrones 42- 47 F6.3 [Sun] [Fe/H] ? Log Fe/H abundance 49- 53 F5.3 [Sun] e_[Fe/H] ? Error on log Fe/H 55 A1 --- l_[C/Fe] Upper limit flag on [C/Fe] 56- 62 F7.3 [Sun] [C/Fe] ? Log C/Fe abundance 64- 69 F6.3 [Sun] e_[C/Fe] ? Error on log C/Fe abundance 71 I1 --- o_[C/Fe] Number of lines for log C/Fe abundance 73 A1 --- l_[N/Fe] Upper limit flag on [N/Fe] 74- 80 F7.3 [Sun] [N/Fe] ? Log N/Fe abundance 82- 86 F5.3 [Sun] e_[N/Fe] ? Error on log N/Fe abundance 88- 89 I2 --- o_[N/Fe] Number of lines for log N/Fe abundance 91 A1 --- l_[O/Fe] Upper limit flag on [O/Fe] 92- 98 F7.3 [Sun] [O/Fe] ? Log O/Fe abundance 100-104 F5.3 [Sun] e_[O/Fe] ? Error on log O/Fe abundance 106-107 I2 --- o_[O/Fe] Number of lines for log O/Fe abundance 109 A1 --- l_[Mg/Fe] Upper limit flag on [Mg/Fe] 110-116 F7.3 [Sun] [Mg/Fe] ? Log Mg/Fe abundance 118-122 F5.3 [Sun] e_[Mg/Fe] ? Error on log Mg/Fe abundance 124 I1 --- o_[Mg/Fe] Number of lines for log Mg/Fe abundance 126 A1 --- l_[Al/Fe] Upper limit flag on [Al/Fe] 127-133 F7.3 [Sun] [Al/Fe] ? Log Al/Fe abundance 135-139 F5.3 [Sun] e_[Al/Fe] ? Error on log Al/Fe abundance 141 I1 --- o_[Al/Fe] Number of lines for log Al/Fe abundance 143 A1 --- l_[Si/Fe] Upper limit flag on [Si/Fe] 144-150 F7.3 [Sun] [Si/Fe] ? Log Si/Fe abundance 152-156 F5.3 [Sun] e_[Si/Fe] ? Error on log Si/Fe abundance 158-159 I2 --- o_[Si/Fe] Number of lines for log Si/Fe abundance 161 A1 --- l_[K/Fe] Upper limit flag on [K/Fe] 162-168 F7.3 [Sun] [K/Fe] ? Log K/Fe abundance 170-174 F5.3 [Sun] e_[K/Fe] ? Error on log K/Fe abundance 176 I1 --- o_[K/Fe] Number of lines for log K/Fe abundance 178 A1 --- l_[Ca/Fe] Upper limit flag on [Ca/Fe] 179-185 F7.3 [Sun] [Ca/Fe] ? Log Ca/Fe abundance 187-191 F5.3 [Sun] e_[Ca/Fe] ? Error on log Ca/Fe abundance 193 I1 --- o_[Ca/Fe] Number of lines for log Ca/Fe abundance 195 A1 --- l_[Ce/Fe] Upper limit flag on [Ce/Fe] 196-202 F7.3 [Sun] [Ce/Fe] ? Log Ce/Fe abundance 204-208 F5.3 [Sun] e_[Ce/Fe] ? Error on log Ce/Fe abundance 210 I1 --- o_[Ce/Fe] Number of lines for log Ce/Fe abundance 212 A1 --- l_[Nd/Fe] Upper limit flag on [Nd/Fe] 213-219 F7.3 [Sun] [Nd/Fe] ? Log Nd/Fe abundance 221-225 F5.3 [Sun] e_[Nd/Fe] ? Error on log Nd/Fe abundance 227 I1 --- o_[Nd/Fe] Number of lines for log Nd/Fe abundance -------------------------------------------------------------------------------- Acknowledgements: Thomas Masseron, tmasseron(at)iac.es
(End) Patricia Vannier [CDS] 05-Feb-2019
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