ABSTRACT We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope
(HST) to determine the Hubble constant from optical and infrared observations of over 600 …

Old-aged stellar distance indicators are present in all Galactic structures (halo, bulge, disk)
and in galaxies of all Hubble types and, thus, are immensely powerful tools for …

This is the second of two papers reporting results from a program to determine the Hubble
constant to∼ 5% precision from a refurbished distance ladder based on extensive use of …

Abstract Classical Cepheid and RR Lyrae variables are radially pulsating stars that trace
young and old-age stellar populations, respectively. These classical pulsating stars are the …

Using a mid-infrared calibration of the Cepheid distance scale based on recent observations
at 3.6 μm with the Spitzer Space Telescope, we have obtained a new, high-accuracy …

The Cepheid period–luminosity (PL) relation (or Leavitt law) has served as the first rung of
the most widely used extragalactic distance ladder and is central to the determination of the …

Classical Cepheid variable stars (from hereon: Cepheids) are high-sensitivity probes of
stellar evolution and fundamental tracers of cosmic distances. While rotational mixing …

Context. Classical Cepheids (DCEPs) play a fundamental role in the calibration of the
extragalactic distance ladder, which eventually leads to the determination of the Hubble …

This is the final summary paper of our 15 yr program using the Hubble Space Telescope
(HST) to determine the Hubble constant from the Cepheid-calibrated luminosity of Type Ia …

To properly quantify the possible residual systematic errors affecting the classical Cepheid
distance scale, a detailed theoretical scenario is recommended. By extending the set of …