The age and metallicity dependence of the near-infrared magnitudes of red clump stars

Hiroki Onozato, Yoshifusa Ita, Yoshikazu Nakada, Shogo Nishiyama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5600-5613
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume486
Issue number4
DOIs
Publication statusPublished - 2019 Jul 1

Keywords

  • Globular clusters: general
  • Hertzsprung-Russell and colour-magnitude diagrams
  • Magellanic Clouds
  • Stars: distances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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