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The horizontal branch morphology of M31 globular clusters. Extreme second parameter effect in outer halo clusters
S. Perina, M. Bellazzini, A. Buzzoni +4
We use deep, high quality colour magnitude diagrams obtained with the Hubble Space Telescope to compute a simplified version of the Mironov index [SMI; B/(B+R)] to parametrize the…
The horizontal branch luminosity vs metallicity in M31 globular clusters
Luciana Federici, Carla Cacciari, Michele Bellazzini +3
Thanks to the outstanding capabilites of the HST, our current knowledge about the M31 globular clusters (GCs) is similar to our knowledge of the Milky Way GCs in the 1960s-1970s, w…
The Gaia spectrophotometric standard stars survey. I. Preliminary results
E. Pancino, G. Altavilla, S. Marinoni +23
We describe two ground based observing campaigns aimed at building a grid of approximately 200 spectrophotometric standard stars (SPSS), with an internal ~1% precision and tied to…
The Kinematic Properties of BHB and RR Lyrae stars towards the Anticentre and the North Galactic Pole: The Transition between the Inner and the Outer Halo
T. D. Kinman, C. Cacciari, A. Bragaglia +2
We identify 51 blue horizontal branch (BHB) stars, 12 possible BHB stars and 58 RR Lyrae stars in Anticentre fields. Their selection does not depend on their kinematics. Light curv…