Systematics in the Cepheid and TRGB Distance Scales: Metallicity Sensitivity of the Wesenheit Leavitt Law
Barry F. Madore; Wendy L. Freedman · 2024 · The Astrophysical Journal
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Abstract
Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular galaxies, covering a wide range of metallicities, we have searched for evidence of a correlation of the zero-point of the Cepheid period–luminosity relation with H ii region (gas-phase) metallicities. Our analysis, for the 21 galaxies closer than 12.5 Mpc, results in the following conclusions: (1) The zero-points of the Cepheid and TRGB distance scales are in remarkably good agreement, with the mean offset in the zero-points of the most nearby distan
Abstract by Barry F. Madore; Wendy L. Freedman, The Astrophysical Journal (2024) — licensed CC BY 4.0.
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Metadata source: DOAJ · DOI 10.3847/1538-4357/acfaea