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The Bologna Key Project on Omega Cen
F. R. Ferraro, E. Pancino, M. Bellazzini
In this contribution we schematically summarize a number of ongoing, coordinated spectro-photometric projects devoted to the study of the stellar population properties in Omega Cen…
A new calibration of the RGB Tip as a Standard Candle
Michele Bellazzini, Francesco R. Ferraro, Elena Pancino
We have obtained an accurate estimate of the absolute I magnitude of the Tip of the Red Giant Branch (M_I(TRGB)) for the globular cluster Omega Cen, based {\em (a)} on the largest…
Multiple stellar population in the Sextans dwarf spheroidal galaxy?
M. Bellazzini, F. R. Ferraro, E. Pancino
We present wide field (33 X 34 arcmin^2) multiband (BVI) CCD photometry (down to I <= 20.5) of the very low surface brightness dwarf Spheroidal (dSph) galaxy Sextans. In the derive…
Horizontal-Branch Models and the Second-Parameter Effect. IV. The Case of M3 and Palomar 3
M. Catelan, F. R. Ferraro, R. T. Rood
We present a detailed analysis of the "second-parameter pair" of globular clusters M3 (NGC 5272) and Palomar 3. Our main results can be summarized as follows: i) The horizontal-bra…
A step toward the calibration of the RGB Tip as a Standard Candle
M. Bellazzini, F. R. Ferraro, E. Pancino
The absolute I magnitude of the Tip of the Red Giant Branch M_I(TRGB) is one of the most promising Standard Candles actually used in astrophysics as a fundamental pillar for the Co…