Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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The Near-IR TRGB Magnitude and Distance Modulus to NGC 185

  • Sohn, Y.J. (Department of Astronomy, IEAA, Yonsei University) ;
  • Kang, A. (Department of Astronomy, IEAA, Yonsei University) ;
  • Han, W. (Korea Astronomy and Space Science Institute) ;
  • Park, J.H. (Korea Astronomy and Space Science Institute) ;
  • Kim, H.I. (Korea Astronomy and Space Science Institute) ;
  • Kim, J.W. (Department of Astronomy, IEAA, Yonsei University) ;
  • Shin, I.G. (Department of Astronomy, IEAA, Yonsei University) ;
  • Chun, S.H. (Department of Astronomy, IEAA, Yonsei University)
  • Published : 2008.09.15
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Abstract

We determined values of distance modulus to nearby dwarf galaxy NGC 185 from the Tip of Red-Giant Branch (TRGB) method. Apparent magnitudes of the TRGB are estimated from the near-infrared JHK luminosity functions (LFs) of the resolved giant branch stars. Theoretical absolute magnitudes of the TRGB in near-infrared bands have been extracted from the Yonsei-Yale isochrones. The observed apparent and theoretical absolute magnitudes of the TRGB provide values of distance modulus to NGC 185 as (m - M) = $23.39{\pm}0.14$, $23.23{\pm}0.22$, and $23.27{\pm}0.26$ for J,H, and K bands, respectively. Distance modulus in bolometric magnitude is also derived as (m - M) = $23.62{\pm}0.12$.

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