Kavli Affiliate: Wendy L. Freedman
| First 5 Authors: Barry F. Madore, Wendy L. Freedman, , ,
| Summary:
We review the theoretical underpinnings, evolutionary status, calibrations
and current applications of three bright Population II extragalactic distance
indicators: Tip of the Red Giant Branch (TRGB) stars, RR Lyrae variables and
J-Branch Asymptotic Giant Branch (JAGB/Carbon) stars. For M_I (TRGB) = -4.05
mag the Hubble constant is determined to be Ho = 69.8 +/- 0.6 (stat) +/-1.6
(sys) km/s/Mpc.
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