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Title: LITHIUM ABUNDANCES OF THE SUPER-METAL-RICH OPEN CLUSTER NGC 6253

Abstract

High-resolution CTIO 4 m/HYDRA spectroscopy of the super-metal-rich open cluster NGC 6253 ([Fe/H] = +0.43 {+-} 0.01) has been used to study the stellar lithium (Li) abundances near the cluster's turnoff. NGC 6253 greatly expands the range of [Fe/H] for clusters that have a Li abundance analysis. This is important for studying the complicated effects of, and potential correlations with, stellar Fe abundance on surface Li abundance. Comparisons to the younger and less-metal-rich Hyades and to the similarly aged but solar-metallicity M67 show that NGC 6253's Li abundances are qualitatively consistent with the prediction, from Standard Stellar Evolution Theory, that higher-metallicity stars have a greater Li depletion. Comparison with M67 provides evidence that the more-metal-rich NGC 6253 had a higher initial Li, which is consistent with expectations from models of Galactic Li production. NGC 6253 is also compared to the intermediate-aged NGC 3680, NGC 752, and IC 4651 open clusters. Comparison of the Li-gap positions in all six clusters shows that (1) the gap's position in T{sub eff} is independent of metallicity, but (2) higher-metallicity clusters have their gaps in higher-mass stars. In addition, the Li gap's position is shown not to evolve with age, which provides an important constraintmore » for the non-standard depletion mechanisms that may create the Li gap.« less

Authors:
 [1]; ;  [2]; ;  [3]
  1. Departamento de Astronomia, Universidad de Concepcion 160-C Casilla, Concepcion (Chile)
  2. Department of Astronomy, Indiana University Bloomington, IN 47405-7105 (United States)
  3. Department of Physics and Astronomy, University of Kansas Lawrence, KS 66045-7582 (United States)
Publication Date:
OSTI Identifier:
22089820
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 144; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; CORRELATIONS; ELEMENT ABUNDANCE; HYDROGEN; IRON; LITHIUM; MASS; RESOLUTION; STAR CLUSTERS; STAR EVOLUTION; STARS

Citation Formats

Cummings, Jeffrey D., Deliyannis, Constantine P., Maderak, Ryan M., Anthony-Twarog, Barbara, and Twarog, Bruce, E-mail: jcummings@astro-udec.cl, E-mail: con@astro.indiana.edu, E-mail: maderak@astro.indiana.edu, E-mail: bjat@ku.edu, E-mail: btwarog@ku.edu. LITHIUM ABUNDANCES OF THE SUPER-METAL-RICH OPEN CLUSTER NGC 6253. United States: N. p., 2012. Web. doi:10.1088/0004-6256/144/5/137.
Cummings, Jeffrey D., Deliyannis, Constantine P., Maderak, Ryan M., Anthony-Twarog, Barbara, & Twarog, Bruce, E-mail: jcummings@astro-udec.cl, E-mail: con@astro.indiana.edu, E-mail: maderak@astro.indiana.edu, E-mail: bjat@ku.edu, E-mail: btwarog@ku.edu. LITHIUM ABUNDANCES OF THE SUPER-METAL-RICH OPEN CLUSTER NGC 6253. United States. doi:10.1088/0004-6256/144/5/137.
Cummings, Jeffrey D., Deliyannis, Constantine P., Maderak, Ryan M., Anthony-Twarog, Barbara, and Twarog, Bruce, E-mail: jcummings@astro-udec.cl, E-mail: con@astro.indiana.edu, E-mail: maderak@astro.indiana.edu, E-mail: bjat@ku.edu, E-mail: btwarog@ku.edu. Thu . "LITHIUM ABUNDANCES OF THE SUPER-METAL-RICH OPEN CLUSTER NGC 6253". United States. doi:10.1088/0004-6256/144/5/137.
@article{osti_22089820,
title = {LITHIUM ABUNDANCES OF THE SUPER-METAL-RICH OPEN CLUSTER NGC 6253},
author = {Cummings, Jeffrey D. and Deliyannis, Constantine P. and Maderak, Ryan M. and Anthony-Twarog, Barbara and Twarog, Bruce, E-mail: jcummings@astro-udec.cl, E-mail: con@astro.indiana.edu, E-mail: maderak@astro.indiana.edu, E-mail: bjat@ku.edu, E-mail: btwarog@ku.edu},
abstractNote = {High-resolution CTIO 4 m/HYDRA spectroscopy of the super-metal-rich open cluster NGC 6253 ([Fe/H] = +0.43 {+-} 0.01) has been used to study the stellar lithium (Li) abundances near the cluster's turnoff. NGC 6253 greatly expands the range of [Fe/H] for clusters that have a Li abundance analysis. This is important for studying the complicated effects of, and potential correlations with, stellar Fe abundance on surface Li abundance. Comparisons to the younger and less-metal-rich Hyades and to the similarly aged but solar-metallicity M67 show that NGC 6253's Li abundances are qualitatively consistent with the prediction, from Standard Stellar Evolution Theory, that higher-metallicity stars have a greater Li depletion. Comparison with M67 provides evidence that the more-metal-rich NGC 6253 had a higher initial Li, which is consistent with expectations from models of Galactic Li production. NGC 6253 is also compared to the intermediate-aged NGC 3680, NGC 752, and IC 4651 open clusters. Comparison of the Li-gap positions in all six clusters shows that (1) the gap's position in T{sub eff} is independent of metallicity, but (2) higher-metallicity clusters have their gaps in higher-mass stars. In addition, the Li gap's position is shown not to evolve with age, which provides an important constraint for the non-standard depletion mechanisms that may create the Li gap.},
doi = {10.1088/0004-6256/144/5/137},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 5,
volume = 144,
place = {United States},
year = {2012},
month = {11}
}