Galactic Calibration of the Tip of the Red Giant Branch

Abstract

Indications from Gaia data release 2 (DR2) are that the tip of the red giant branch (TRGB, a population II standard candle related to the helium flash in low mass stars) is close to -4 in absolute I magnitude in the Cousins photometric system. Our sample is high latitude southern stars from the thick disk and inner halo, and our result is consistent with longstanding findings from globular clusters, whose distances were calibrated with RR Lyrae stars. As the Gaia mission proceeds, there is every reason to think an accurate Galactic geometric calibration of TRGB will be a significant outcome.

arXiv commentto appear in PASA

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Cited by in corpus (13)

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• Cosmicflows-4
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• Fundamental stellar parameters of benchmark stars from CHARA interferometry. I. Metal-poor stars
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• A Geometric Calibration of the Tip of the Red Giant Branch in the Milky Way using Gaia DR3
• The metallicity sensitivity of a surface brightness temperature scale