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Reconciling the Galactic Bulge Turnoff Age Discrepancy with Enhanced Helium Enrichment
David M. Nataf, Andrew P. Gould
We show that the factor 2 discrepancy between spectroscopic and photometric age determinations of the Galactic bulge main-sequence turnoff can be naturally explained by posit…
Red Giant Branch Bump Brightness and Number Counts in 72 Galactic Globular Clusters Observed with the Hubble Space Telescope
David M. Nataf, Andrew P. Gould, Marc H. Pinsonneault +1
We present the broadest and most precise empirical investigation of red giant branch bump (RGBB) brightness and number counts ever conducted. We implement a new method and use data…
The Intrinsic I-Band Magnitude Dispersion of the Galactic Bulge Red Clump
David M. Nataf, Andrzej Udalski
We measure the intrinsic magnitude dispersion of the Galactic bulge red clump (RC) using two different methods and arrive at an estimate of σ_{I} ~ 0.17 mag. We first estimate the…
The Optical Gravitational Lensing Experiment: Analysis of the bulge RR Lyrae population from the OGLE-III data
P. Pietrukowicz, A. Udalski, I. Soszynski +8
We have analyzed the data on 16,836 RR Lyrae (RR Lyr) variables observed toward the Galactic bulge during the third phase of the Optical Gravitational Lensing Experiment (OGLE-III)…
The Gradients in the 47 Tuc Red Giant Branch Bump and Horizontal Branch are Consistent With a Centrally-Concentrated, Helium-Enriched Second Stellar Generation
D. M. Nataf, A. Gould, M. H. Pinsonneault +1
We combine ground and space-based photometry of the Galactic globular cluster 47 Tuc to measure four independent lines of evidence for a helium gradient in the cluster, whereby sta…