Constraints on the Distance Moduli, Helium, and Metal Abundances, and Ages of Globular Clusters from Their RR Lyrae and Non-variable Horizontal Branch Stars. II. Multiple Stellar Populations in 47 Tuc, M3, and M13 [PDF]
, 2017 We present a new set of horizontal branch (HB) models computed with the MESA stellar evolution code. The models adopt α-enhanced Asplund et al. metal mixtures and include the gravitational settling of He. They are used in our HB population synthesis tool
P. Denissenkov +3 more
semanticscholar +1 more source
VVV Survey of Blue Horizontal Branch Stars in the Bulge–Halo Transition Region of the Milky Way [PDF]
Astrophysical Journal, 2018 We characterize the population of blue horizontal branch (BHB) stars in the bulge–halo transition region of the Milky Way using the VISTA Variables in the Vía Láctea (VVV) ESO Public Survey data.
K. Montenegro +6 more
semanticscholar +1 more source
Mapping the anisotropic Galactic stellar halo with blue horizontal branch stars [PDF]
Astronomy & AstrophysicsWe used Legacy Survey photometric data to probe the stellar halo in multiple directions of the sky using a probabilistic methodology to identify blue horizontal branch (BHB) stars. The measured average radial density profile follows a double power law in
Joao A. S. Amarante +2 more
semanticscholar +1 more source
SHOTGLAS: I. The ultimate spectroscopic census of extreme horizontal branch stars in ω Centauri [PDF]
, 2018 The presence of extreme horizontal branch (EHB) and blue hook stars in some Galactic globular clusters (GGCs) constitutes one of the remaining mysteries of stellar evolution.
M. Latour +4 more
semanticscholar +1 more source
Multiple Stellar Populations along the Red Horizontal Branch and Red Clump of Globular Clusters [PDF]
, 2020 We exploit multiband Hubble Space Telescope photometry to investigate multiple populations (MPs) along the red horizontal branches (HBs) and red clumps of 14 metal-rich globular clusters (GCs), including 12 Milky Way GCs and the Magellanic Cloud GCs NGC ...
E. Dondoglio +7 more
semanticscholar +1 more source
CONSTRAINTS ON THE DISTANCE MODULI, HELIUM AND METAL ABUNDANCES, AND AGES OF GLOBULAR CLUSTERS FROM THEIR RR LYRAE AND NON-VARIABLE HORIZONTAL-BRANCH STARS. I. M3, M15, AND M92 [PDF]
, 2016 Up-to-date isochrones, zero-age horizontal-branch (ZAHB) loci, and evolutionary tracks for core He-burning stars are applied to the color–magnitude diagrams of M3, M15, and M92, focusing in particular on their RR Lyrae populations.
D. VandenBerg +2 more
semanticscholar +1 more source
Multiple Stellar Populations in Asymptotic Giant Branch Stars of Galactic Globular Clusters [PDF]
, 2021 Multiple stellar populations (MPs) are a distinct characteristic of globular clusters (GCs). Their general properties have been widely studied among main-sequence, red giant branch (RGB), and horizontal branch (HB) stars, but a common framework is still ...
E. Lagioia +10 more
semanticscholar +1 more source
Characterizing stellar halo populations II: the age gradient in blue horizontal-branch stars [PDF]
, 2016 The distribution of Milky Way halo blue horizontal-branch (BHB) stars is examined using action-based extended distribution functions (EDFs) that describe the locations of stars in phase space, metallicity, and age.
P. Das, Angus Williams, J. Binney
semanticscholar +1 more source
RR Lyrae stars and the horizontal branch of NGC 5904 (M5) [PDF]
, 2016 We report the distance and [Fe/H] value for the globular cluster NGC 5904 (M5) derived from the Fourier decomposition of the light curves of selected RRab and RRc stars.
A. Arellano Ferro +5 more
semanticscholar +1 more source
Level of helium enhancement among M3's horizontal-branch stars [PDF]
, 2016 (Abridged) The color and luminosity distribution of horizontal branch (HB) stars in globular clusters are sensitive probes of their original helium abundances.
A. Valcarce +4 more
semanticscholar +1 more source