TY - JOUR
T1 - The age and metallicity dependence of the near-infrared magnitudes of red clump stars
AU - Onozato, Hiroki
AU - Ita, Yoshifusa
AU - Nakada, Yoshikazu
AU - Nishiyama, Shogo
N1 - Funding Information:
This work was supported by Grant-in-Aid for Japan Society for the Promotion of Science Research Fellow Grant Number JP16J00865. The IRSF project is a collaboration between Nagoya University and the SAAO supported by the Grants-in-Aid for Scientific Research on Priority Areas (A) (No. 10147207 and No. 10147214) and Optical & Near-Infrared Astronomy Inter-University Cooperation Program, from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan and the National Research Foundation (NRF) of South Africa. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
Publisher Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Red clump (RC) stars are widely used as an excellent standard candle. To make them even better, it is important to know the dependence of their absolute magnitudes on age and metallicity.We observed star clusters in the LargeMagellanic Cloud to fill age and metallicity parameter space, which previous work has not observationally studied. We obtained the empirical relations of the age and metallicity dependence of absolute magnitudes MJ, MH, and MKS , and colours J - H, J - KS, and H - KS of RC stars, although the coefficients have large errors. Mean near-infrared magnitudes of the RC stars in the clusters show relatively strong dependence on age for young RC stars. The J - KS and H - KS colours show the nearly constant values of 0.528 ± 0.015 and 0.047 ± 0.011, respectively, at least within the ages of 1.1-3.2 Gyr and [Fe/H] of -0.90 to -0.40 dex. We also confirmed that the population effects of observational data are in good agreement with the model prediction.
AB - Red clump (RC) stars are widely used as an excellent standard candle. To make them even better, it is important to know the dependence of their absolute magnitudes on age and metallicity.We observed star clusters in the LargeMagellanic Cloud to fill age and metallicity parameter space, which previous work has not observationally studied. We obtained the empirical relations of the age and metallicity dependence of absolute magnitudes MJ, MH, and MKS , and colours J - H, J - KS, and H - KS of RC stars, although the coefficients have large errors. Mean near-infrared magnitudes of the RC stars in the clusters show relatively strong dependence on age for young RC stars. The J - KS and H - KS colours show the nearly constant values of 0.528 ± 0.015 and 0.047 ± 0.011, respectively, at least within the ages of 1.1-3.2 Gyr and [Fe/H] of -0.90 to -0.40 dex. We also confirmed that the population effects of observational data are in good agreement with the model prediction.
KW - Globular clusters: general
KW - Hertzsprung-Russell and colour-magnitude diagrams
KW - Magellanic Clouds
KW - Stars: distances
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U2 - 10.1093/mnras/stz1192
DO - 10.1093/mnras/stz1192
M3 - Article
AN - SCOPUS:85067995899
SN - 0035-8711
VL - 486
SP - 5600
EP - 5613
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -