Considerable progress has been made in determining the Hubble constant over the past
two decades. We discuss the cosmological context and importance of an accurate …

The tip of the red giant branch (TRGB) method provides one of the most accurate and
precise means of measuring the distances to nearby galaxies. Here we present a multi …

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 …

ABSTRACT We use the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope
(HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4 …

We present phase-corrected photometric measurements of 88 Cepheid variables in the core
of the Small Magellanic Cloud (SMC), the first sample obtained with the Hubble Space …

We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular
galaxies (dIrrs), and we show that dIrrs obey the same mass–metallicity relation as the dwarf …

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 …

Based on a homogeneous set of X-ray, infrared and ultraviolet observations from Chandra,
Spitzer, GALEX and 2MASS archives, we study populations of high-mass X-ray binaries …

I reanalyse the Riess et al.(hereafter) Cepheid data using the revised geometric maser
distance to NGC 4258 of Humphreys et al.(hereafter). I explore different outlier rejection …

ABSTRACT We present LITTLE THINGS (Local Irregulars That Trace Luminosity Extremes,
The H i Nearby Galaxy Survey), which is aimed at determining what drives star formation in …