Population effects on the red giant clump absolute magnitude, and distance determinations to nearby galaxies
نویسندگان
چکیده
منابع مشابه
Population effects on the Red Giant Clump absolute magnitude, and distance determinations to nearby galaxies
The red giant clump has been recently argued to be a reliable distance indicator for the galaxies in the Local Group. The accuracy of distance determinations based on this method, however, depend on the possible presence of systematic magnitude differences (∆M I ) between the local clump revealed by the Hipparcos colour-magnitude diagram, and the clump stars observed in distant galaxies. In thi...
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We present a detailed analysis of the behaviour of the Red Clump K-band absolute magnitude (M K ) in simple and composite stellar populations, in light of its use as standard candle for distance determinations. The advantage of using M K , following recent empirical calibrations of its value for the solar neighbourhood, arises from its very low sensitivity to the extinction by interstellar dust...
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The I-band brightnessMI of clump stars is a possible distance indicator for stellar populations. Investigations have shown that MI is almost insensitive to the (V − I) colour within the clump. Based on this, it was assumed that MI was insensitive to age and composition of the stellar population and therefore an ideal standard candle, which could be calibrated with local clump stars, whose absol...
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We have determined the distance to M33 using the tip of the red giant branch (TRGB) and the red clump (RC), from the V I photometry of stars in ten regions of M33 based onHST/WFPC2 images. The regions used in this study are located at R = 2.6 − 17.8 arcmin from the center of M33. The distance modulus to M33 obtained in this study, for an adopted foreground reddening of E(B − V ) = 0.04, is (m −...
متن کاملK-Band Red Clump Distance to the Large Magellanic Cloud
The Hipparcos I-band calibration of horizontal-branch red clump giants as standard candles has lead to controversial results for the distance to the Large Magellanic Cloud (LMC). In an attempt to properly ascertain the corrections for interstellar extinction and clump age and metallicity, we analyze new multiwavelength luminosity functions of the LMC red clump. Our photometry dataset in the K-b...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2001
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2001.04084.x