1.4k citations · 25.8k across the 323 of their papers we have counts for
4 papers · 1 filter
The Red Giant Branch Luminosity Function Bump
M. Riello, S. Cassisi, G. Piotto +6
We present observational estimates of the magnitude difference between the luminosity function RGB bump and the HB (Delta(bump-zahb)), and of star counts in the bump region (R_bump…
Why Hot Horizontal Branch Stars Can Appear Redder Than Red Giants
Y. Momany, S. Cassisi, G. Piotto +4
In this paper we report on a curious feature in the V, (U-B) color-magnitude diagrams of globular clusters. In our database, we find that a considerable fraction of blue horizontal…
The Red Giant Branch Bump
M. Riello, G. Piotto, A. Recio-Blanco +2
We present a comparison between theoretical models and the observed magnitude difference between the horizontal branch and the red giant branch bump for a sample of 53 clusters. We…
The initial Helium content of Galactic Globular Cluster stars from the R-parameter: comparison with the CMB constraint
S. Cassisi, M. Salaris, A. W. Irwin
Recent precise determinations of the primordial He-abundance (Y_p) from cosmic microwave background (CMB) analyses and cosmological nucleosynthesis computations, provide Y_p=0.248$…