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We show that the I magnitude of the tip of the first-ascent red giant branch (TRGB) of low-mass stars is a distance indicator for resolved galaxies with metal-poor (Fe/H < -0.7 dex) old populations, having a precision comparable to primary distance indicators such as Cepheids and RR Lyraes. A comparison of the distances to resolved galaxies based on the TRGB with those derived from Cepheids and RR Lyraes shows that they agree within ‰0.1 mag. Advantages o{ the TRGB method are discussed.
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Myung Gyoon Lee
Seoul National University
Wendy L. Freedman
University of Chicago
Barry F. Madore
École Normale Supérieure de Lyon
The Astrophysical Journal
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Lee et al. (Mon,) studied this question.
synapsesocial.com/papers/69d8f08d2c39562886ae349c — DOI: https://doi.org/10.1086/173334