activity
19952022
most citedThe Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues

490 citations · 5.2k across the 57 of their papers we have counts for

collaborators

57 papers

astro-ph.SR2022★ 7 cited

Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. III. Grids of Isochrones for [Fe/H] and Helium Abundances and at Each Metallicity

Don A. VandenBerg

Stellar evolutionary tracks for have been computed for each of several variations in the abundances of C, N, and O, assuming mass-fraction helium abund…

astro-ph.SR2021★ 12 cited

Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. II. Application to the Colour-Magnitude Diagrams of the Globular Clusters 47 Tuc, NGC 6362, M5, M3, M55, and M92

Don A. VandenBerg, Luca Casagrande, Bengt Edvardsson

Stellar models for -2.5 <= [Fe/H] <= -0.5 that have been computed for variations in the C:N:O abundance ratio (for two different values of [CNO/Fe]) are compared with HST Wide Fiel…

astro-ph.SR2021★ 12 cited

Models of Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. I. Bolometric Corrections Derived from New MARCS Synthetic Spectra and Their Implications for Observed Colour-Magnitude Diagrams

Don A. VandenBerg, Bengt Edvardsson, Luca Casagrande +1

New, high-resolution MARCS synthetic spectra have been calculated for more than a dozen mixtures of the metals allowing, in turn, for variations in C:N:O, [CNO/Fe], and enhanced ab…

astro-ph.SR2020★ 13 cited

Properties of the Hyades, the eclipsing binary HD27130, and the oscillating red giant Tau

K. Brogaard, E. Pakštienė, F. Grundahl +21

Eclipsing binary stars allow derivation of accurate and precise masses and radii. When they reside in star clusters, properties of even higher precision, along with additional info…

astro-ph.SR2020★ 6 cited

Hubble Space Telescope Astrometry of the Metal-Poor Visual Binary Cassiopeiae: Dynamical Masses, Helium Content, and Age

Howard E. Bond, Gail H. Schaefer, Ronald L. Gilliland +1

Cassiopeiae is a nearby, high-velocity, metal-poor () visual binary. We have used high-resolution imaging with the Hubble Space Telescope (HST), obtained over…

astro-ph.SR2018★ 25 cited

The blue straggler V106 in NGC6791: A prototype progenitor of old single giants masquerading as young

K. Brogaard, S. M. Christiansen, F. Grundahl +18

We determine the properties of the binary star V106 in the old open cluster NGC6791. We identify the system to be a blue straggler cluster member by using a combination of ground-b…