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A Step toward the Calibration of the Red Giant Branch Tip as a Standard Candle
The absolute I magnitude of the tip of the red giant branch (M) is one of the most promising standard candles actually used in astrophysics as a fundamental pillar for the cosmological distance
The calibration of the RGB Tip as a Standard Candle Extension to Near Infrared colors and higher metallicity
New empirical calibrations of the Red Giant Branch Tip in the I, J, H and K bands based on two fundamental pillars, namely ω Centauri and 47 Tucanae, have been obtained by using a large optical and
Metallicities, Relative Ages, and Kinematics of Stellar Populations in ω Centauri*
We present results of an extensive spectroscopic survey of subgiant stars in the stellar system ω Cen. Using infrared Ca II triplet lines, we derived metallicities and radial velocities for more than
Red giant branch in near-infrared colour¿magnitude diagrams ¿ I. Calibration of photometric indices
We present new high-quality near-infrared photometry of 10 Galactic globular clusters spanning a wide metallicity range (-2.12 ≤ [Fe/H] ≤ -0.49): five clusters belong to the halo (NGC 288, 362, 6752,
The age of the main population of the Sagittarius dwarf spheroidal galaxy. Solving the "M giant conundrum"
We present a statistically decontaminated Color Magnitude Diagram of a $1\degr\times 1\degr$ field in the core of the Sagittarius dSph galaxy. Coupling this CMD with the most recent metallicity
Red giant branch in near-infrared colour–magnitude diagrams – II. The luminosity of the bump and the tip
We present new empirical calibrations of the red giant branch (RGB) bump and tip based on a homogeneous near-infrared data base of 24 Galactic globular clusters. The luminosities of the RGB bump and
The Ital-FLAMES survey of the Sagittarius dwarf spheroidal galaxy - I. Chemical abundances of bright RGB stars
We present iron and α element (Mg, Ca, Ti) abundances for a sample of 15 Red Giant Branch stars belonging to the main body of the Sagittarius dwarf Spheroidal galaxy. Abundances have been obtained
The Draco and Ursa Minor dwarf spheroidals. A comparative study
We present (V,I) photometry of two wide (~25 X 25 arcmin^2) fields centered on the low surface brightness dwarf spheroidal galaxies Draco and Ursa Minor. New estimates of the distance to these
On the discrete nature of the red giant branch of ω Centauri
We report on the results of an extensive Very Large Telescope high-resolution imaging campaign of the central region of the giant globular cluster ω Centauri. More than 100000 stars have been
The cluster Terzan 5 as a remnant of a primordial building block of the Galactic bulge
It is reported that Terzan 5, a globular-cluster-like system in the Galactic bulge, has two stellar populations with different iron contents and ages, which could be the surviving remnant of one of the primordial building blocks that are thought to merge and form galaxy bulges.