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The Core Mass Growth and Stellar Lifetime of Thermally Pulsing Asymptotic Giant Branch Stars
Jason S. Kalirai, Paola Marigo, Pier-Emmanuel Tremblay
We establish new constraints on the intermediate-mass range of the initial-final mass relation by studying white dwarfs in four young star clusters, and apply the results to study…
The Formation History of the Ultra-Faint Dwarf Galaxies
Thomas M. Brown, Jason Tumlinson, Marla Geha +11
We present early results from a Hubble Space Telescope survey of the ultra-faint dwarf galaxies. These Milky Way satellites were discovered in the Sloan Digital Sky Survey, and app…
Comparing the White Dwarf Cooling Sequences in 47 Tuc and NGC 6397
Harvey B. Richer, Ryan Goldsbury, Jeremy Heyl +7
Using deep Hubble Space Telescope imaging, color-magnitude diagrams are constructed for the globular clusters 47 Tuc and NGC 6397. As expected, because of its lower metal abundance…
An Age Difference of 2 Gyr between a Metal-Rich and a Metal-Poor Globular Cluster
B. M. S. Hansen, J. S. Kalirai, J. Anderson +9
Globular clusters trace the formation history of the spheroidal components of both our Galaxy and others, which represent the bulk of star formation over the history of the univers…
A Dynamical Signature of Multiple Stellar Populations in 47 Tucanae
Harvey B. Richer, Jeremy Heyl, Jay Anderson +5
Based on the width of its main sequence, and an actual observed split when viewed through particular filters, it is widely accepted that 47 Tucanae contains multiple stellar popula…
WFIRST-2.4: What Every Astronomer Should Know
D. Spergel, N. Gehrels, J. Breckinridge +43
The Astro2010 Decadal Survey recommended a Wide Field Infrared Survey Telescope (WFIRST) as its top priority for a new large space mission. The report of the WFIRST-AFTA Science De…