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Helium enhanced stars and multiple populations along the horizontal branch of NGC2808: direct spectroscopic measurements
A. F. Marino, A. P. Milone, N. Przybilla +15
We present an abundance analysis of 96 horizontal branch (HB) stars in NGC2808, a globular cluster exhibiting a complex multiple stellar population pattern. These stars are distrib…
3D maps of the local ISM from inversion of individual color excess measurements
Rosine Lallement, Jean-Luc Vergely, Bernard Valette +3
Three-dimensional (3D) maps of the Galactic interstellar matter (ISM) are a potential tool of wide use, however accurate and detailed maps are still lacking. One of the ways to con…
High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun
TalaWanda R. Monroe, Jorge Meléndez, Iván Ramírez +13
We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with preci…
Fundamental stellar properties from asteroseismology
V. Silva Aguirre, L. Casagrande, A. Miglio
Accurate characterization of stellar populations is of prime importance to correctly understand the formation and evolution process of our Galaxy. The field of asteroseismology has…
The 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
Don A. Vandenberg, Karsten Brogaard, Ryan Leaman +1
Ages have been derived for 55 globular clusters (GCs) from overlays of isochrones onto the turnoff photometry, assuming distances based on fits of zero-age horizontal branch (ZAHB)…
Stellar ages and convective cores in field main-sequence stars: first asteroseismic application to two Kepler targets
V. Silva Aguirre, S. Basu, I. M. Brandão +21
Using asteroseismic data and stellar evolution models we make the first detection of a convective core in a Kepler field main-sequence star, putting a stringent constraint on the t…