CHRONOGRAPHY OF THE MILKY WAY’S HALO SYSTEM WITH FIELD BLUE HORIZONTAL-BRANCH STARS [PDF]
, 2015 In a pioneering effort, Preston et al. reported that the colors of blue horizontal-branch (BHB) stars in the halo of the Galaxy shift with distance, from regions near the Galactic center to about 12 kpc away, and interpreted this as a correlated ...
R. Santucci +8 more
semanticscholar +1 more source
Inclusion of horizontal branch stars in the derivation of star formation histories of dwarf galaxies: The Carina dSph [PDF]
, 2015 We present a detailed analysis of the horizontal branch of the Carina dwarf spheroidal galaxy by means of synthetic modelling techniques, taking consistently into account the star formation history and metallicity evolution as determined from main ...
A. Savino +5 more
semanticscholar +1 more source
The HST/ACS star formation history of the Tucana dwarf spheroidal galaxy: clues from the horizontal branch [PDF]
Astronomy & Astrophysics, 2019 We report a new star formation history for the Tucana dwarf spheroidal galaxy, obtained from a new look at a deep HST/ACS colour-magnitude diagram. We combined information from the main sequence turn-off and the horizontal branch to resolve the ancient ...
A. Savino +4 more
semanticscholar +1 more source
The Na-O anticorrelation in horizontal branch stars. V. NGC 6723 [PDF]
, 2014 We used FLAMES+GIRAFFE (Medusa mode) at the VLT to obtain moderately high resolution spectra for 30 red horizontal branch (RHB) stars, 4 RR Lyrae variables, and 17 blue horizontal branch (BHB) stars in the low-concentration, moderately metal-rich ...
R. Gratton +9 more
semanticscholar +1 more source
Horizontal branch morphology: A new photometric parametrization [PDF]
Astronomy & Astrophysics, 2019 Context. Theory and observations indicate that the distribution of stars along the horizontal branch of Galactic globular clusters mainly depends on the metal content.
M. Torelli +10 more
semanticscholar +1 more source
Helium enhanced stars and multiple populations along the horizontal branch of NGC 2808: direct spectroscopic measurements [PDF]
, 2013 We present an abundance analysis of 96 horizontal branch (HB) stars in NGC 2808, a globular cluster exhibiting a complex multiple stellar population p attern.
A. Marino +18 more
semanticscholar +1 more source
The Milky Way’s Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from the Kinematics of ~2400 SDSS Blue Horizontal-Branch Stars [PDF]
, 2008 We derive new constraints on the mass of the Milky Way’s dark matter halo, based on 2401 rigorously selected blue horizontal-branch halo stars from SDSS DR6.
X. Xue +18 more
semanticscholar +1 more source
Spectroscopy of blue horizontal branch stars in NGC 6656 (M 22) [PDF]
, 2013 Context. Recent investigations revealed very peculiar properties o f blue horizontal branch (HB) stars in ω Centauri, which show anomalously low surface gravity and mass compared to other clusters and to theoretical models. ω Centauri, however, is a very
C. Salgado +4 more
semanticscholar +1 more source
KINEMATICS OF THE STELLAR HALO AND THE MASS DISTRIBUTION OF THE MILKY WAY USING BLUE HORIZONTAL BRANCH STARS [PDF]
, 2012 Here, we present a kinematic study of the Galactic halo out to a radius of ∼60 kpc, using 4664 blue horizontal branch stars selected from the SDSS/SEGUE survey to determine key dynamical properties.
P. Kafle +3 more
semanticscholar +1 more source
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569 [PDF]
, 2018 Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a double red horizontal branch (HB).
Christian I. Johnson +6 more
semanticscholar +1 more source