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Title: The lithium abundances of a large sample of red giants

Abstract

The lithium abundances for 378 G/K giants are derived with non-local thermodynamic equilibrium correction considered. Among these are 23 stars that host planetary systems. The lithium abundance is investigated, as a function of metallicity, effective temperature, and rotational velocity, as well as the impact of a giant planet on G/K giants. The results show that the lithium abundance is a function of metallicity and effective temperature. The lithium abundance has no correlation with rotational velocity at v sin i < 10 km s{sup –1}. Giants with planets present lower lithium abundance and slow rotational velocity (v sin i < 4 km s{sup –1}). Our sample includes three Li-rich G/K giants, 36 Li-normal stars, and 339 Li-depleted stars. The fraction of Li-rich stars in this sample agrees with the general rate of less than 1% in the literature, and the stars that show normal amounts of Li are supposed to possess the same abundance at the current interstellar medium. For the Li-depleted giants, Li-deficiency may have already taken place at the main sequence stage for many intermediate mass (1.5-5 M {sub ☉}) G/K giants. Finally, we present the lithium abundance and kinematic parameters for an enlarged sample of 565 giants usingmore » a compilation of the literature, and confirm that the lithium abundance is a function of metallicity and effective temperature. With the enlarged sample, we investigate the differences between the lithium abundance in thin-/thick-disk giants, which indicate that the lithium abundance in thick-disk giants is more depleted than that in thin-disk giants.« less

Authors:
; ; ; ;  [1];  [2];  [3]
  1. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012 (China)
  2. Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
  3. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22357127
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 785; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; CORRECTIONS; CORRELATIONS; DATA ANALYSIS; LITHIUM; LTE; MASS; METALLICITY; PLANETS; RED GIANT STARS; STARS; VELOCITY

Citation Formats

Liu, Y. J., Tan, K. F., Wang, L., Zhao, G., Li, H. N., Sato, Bun'ei, and Takeda, Y., E-mail: lyj@nao.cas.cn, E-mail: gzhao@nao.cas.cn. The lithium abundances of a large sample of red giants. United States: N. p., 2014. Web. doi:10.1088/0004-637X/785/2/94.
Liu, Y. J., Tan, K. F., Wang, L., Zhao, G., Li, H. N., Sato, Bun'ei, & Takeda, Y., E-mail: lyj@nao.cas.cn, E-mail: gzhao@nao.cas.cn. The lithium abundances of a large sample of red giants. United States. doi:10.1088/0004-637X/785/2/94.
Liu, Y. J., Tan, K. F., Wang, L., Zhao, G., Li, H. N., Sato, Bun'ei, and Takeda, Y., E-mail: lyj@nao.cas.cn, E-mail: gzhao@nao.cas.cn. Sun . "The lithium abundances of a large sample of red giants". United States. doi:10.1088/0004-637X/785/2/94.
@article{osti_22357127,
title = {The lithium abundances of a large sample of red giants},
author = {Liu, Y. J. and Tan, K. F. and Wang, L. and Zhao, G. and Li, H. N. and Sato, Bun'ei and Takeda, Y., E-mail: lyj@nao.cas.cn, E-mail: gzhao@nao.cas.cn},
abstractNote = {The lithium abundances for 378 G/K giants are derived with non-local thermodynamic equilibrium correction considered. Among these are 23 stars that host planetary systems. The lithium abundance is investigated, as a function of metallicity, effective temperature, and rotational velocity, as well as the impact of a giant planet on G/K giants. The results show that the lithium abundance is a function of metallicity and effective temperature. The lithium abundance has no correlation with rotational velocity at v sin i < 10 km s{sup –1}. Giants with planets present lower lithium abundance and slow rotational velocity (v sin i < 4 km s{sup –1}). Our sample includes three Li-rich G/K giants, 36 Li-normal stars, and 339 Li-depleted stars. The fraction of Li-rich stars in this sample agrees with the general rate of less than 1% in the literature, and the stars that show normal amounts of Li are supposed to possess the same abundance at the current interstellar medium. For the Li-depleted giants, Li-deficiency may have already taken place at the main sequence stage for many intermediate mass (1.5-5 M {sub ☉}) G/K giants. Finally, we present the lithium abundance and kinematic parameters for an enlarged sample of 565 giants using a compilation of the literature, and confirm that the lithium abundance is a function of metallicity and effective temperature. With the enlarged sample, we investigate the differences between the lithium abundance in thin-/thick-disk giants, which indicate that the lithium abundance in thick-disk giants is more depleted than that in thin-disk giants.},
doi = {10.1088/0004-637X/785/2/94},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 785,
place = {United States},
year = {2014},
month = {4}
}