In the era of precision cosmology, it is essential to determine the Hubble constant empirically
with an accuracy of one per cent or better. At present, the uncertainty on this constant is …

We present results from the analysis of 401 RR Lyrae stars (RRLs) belonging to the field of
the Milky Way (MW). For a fraction of them multiband (V, K s, W 1) photometry, metal …

Abstract The Vera C. Rubin Legacy Survey of Space and Time (LSST) holds the potential to
revolutionize time domain astrophysics, reaching completely unexplored areas of the …

ABSTRACT RR Lyrae stars have long been popular standard candles, but significant
advances in methodology and technology have been made in recent years to increase their …

We present new luminosity–metallicity (LZ; and) relations and, for the first time, empirical,
Gaia three-band (G, G BP, G RP) period-Wesenheit-metallicity (PWZ) relations of RR Lyrae …

Based on updated pulsation models for classical Cepheids, computed for various
assumptions about the metallicity and helium abundance, roughly representative of …

ABSTRACT HP 1 is an α-enhanced and moderately metal-poor bulge globular cluster with a
blue horizontal branch. These combined characteristics make it a probable relic of the early …

Convective boundary mixing (CBM) is ubiquitous in stellar evolution. It is a necessary
ingredient in the models in order to match observational constraints from clusters, binaries …

This paper presents results from photometric and statistical-parallax analysis of a sample of
850 field RR Lyrae (RRL) variables. The photometric and spectroscopic data for our sample …

Bulge globular clusters (GCs) with metallicities [Fe/H]≲− 1.0 and blue horizontal branches
are candidates to harbor the oldest populations in the Galaxy. Based on the analysis of HST …