Chemical Abundances Of Open Clusters From High-Resolution Infrared Spectra. II. NGC 752

Abstract

We present a detailed near-infrared chemical abundance analysis of 10 red giant members of the Galactic open cluster NGC 752. High-resolution (R$\simeq$45000) near-infrared spectral data were gathered with the Immersion Grating Infrared Spectrograph (IGRINS), providing simultaneous coverage of the complete H and K bands. We derived the abundances of H-burning (C, N, O), $\alpha$ (Mg, Si, S, Ca), light odd-Z (Na, Al, P, K), Fe-group (Sc, Ti, Cr, Fe, Co, Ni) and neutron-capture (Ce, Nd, Yb) elements. We report the abundances of S, P, K, Ce, and Yb in NGC 752 for the first time. Our analysis yields solar metallicity and solar abundance ratios for almost all of the elements heavier than the CNO group in NGC 752. O and N abundances were measured from a number of OH and CN features in the $H$ band, and C abundances were determined mainly from CO molecular lines in the K band. High excitation \ion{C}{i} lines present in both near-infrared and optical spectra were also included in the C abundance determinations. Carbon isotopic ratios were derived from the R-branch band heads of first overtone (2-0) and (3$-$1) ${}^{12}$CO and (2-0) ${}^{13}$CO lines near 23440 Åand (3-1) ${}^{13}$CO lines at about 23730 Å. The CNO abundances and ${}^{12}$C/${}^{13}$C ratios are all consistent with our giants having completed "first dredge-up" envelope mixing of CN-cyle products. We independently assessed NGC 752 stellar membership from Gaia astrometry, leading to a new color-magnitude diagram for this cluster. Applications of Victoria isochrones and MESA models to these data yield an updated NGC 752 cluster age (1.52 Gyr) and evolutionary stage indications for the program stars. The photometric evidence and spectroscopic light element abundances all suggest that the most, perhaps all of the program stars are members of the helium-burning red clump in this cluster.

arXiv comment16 pages, 11 figures

References in corpus (29)

• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Gaia Data Release 2: Catalogue validation
• The Victoria-Regina Stellar Models: Evolutionary Tracks and Isochrones for a Wide Range in Mass and Metallicity that Allow for Empirically Constrained Amounts of Convective Core Overshooting
• On the use of Gaia magnitudes and new tables of bolometric corrections
• Thermohaline instability and rotation-induced mixing. I - Low- and intermediate-mass solar metallicity stars up to the end of the AGB
• The age of the oldest Open Clusters
• Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. II. age dependencies and new insights
• Chemical abundance analysis of the Open Clusters Berkeley 32, NGC 752, Hyades and Praesepe
• A New Look at an Old Cluster: The Membership, Rotation, and Magnetic Activity of Low-Mass Stars in the 1.3-Gyr-Old Open Cluster NGC 752
• Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506
• On the Abundance of Potassium in Metal-Poor Stars
• Evidence against anomalous compositions for giants in the Galactic Nuclear Star Cluster
• The Potassium abundance in the globular clusters NGC104, NGC6752 and NGC6809
• The Chemical Compositions and Evolutionary Status of Red Giants in the Open Cluster NGC 752
• Chemical Compositions of Evolved Stars From Near-Infrared IGRINS High-Resolution Spectra. I. Abundances in Three Red Horizontal Branch Stars
• Sulfur and zinc abundances of red giant stars
• The Abundance of Fluorine in Normal G and K Stars of the Galactic Thin Disk
• A uvbyCaHbeta CCD Analysis of the Open Cluster Standard, NGC 752
• Deriving temperature, mass and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651
• The chemical compositions and evolutionary status of red giants in the open cluster NGC 6940
• Chemical Abundances Of Open Clusters From High-Resolution Infrared Spectra. I. NGC 6940
• Extended Stromgren Photoelectric Photometry in NGC 752
• A Comparison of the Chemical Composition of Main Sequence and Giant Stars in the Open Cluster NCC 752

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• A uvbyCaHbeta CCD Analysis of the Open Cluster Standard, M67,and its Relation to NGC 752
• M giants with IGRINS IV. Identification and characterization of a near-IR line of the s-element Barium
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