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On the newly discovered Canes Venatici II dSph galaxy
C. Greco, M. Dall'Ora, G. Clementini +11
We report on the detection of variable stars in the Canes Venatici II (CVn II) dwarf spheroidal galaxy, a new satellite of the Milky Way recently discovered by the Sloan Digital Sk…
Multimodal Horizontal Branches: Empirical Evidence and Possible Evolutionary Scenarios
M. Catelan
We review the available empirical evidence for the presence of "gaps" and multimodal distributions among horizontal branch (HB) stars, along with some of the theoretical scenarios…
Meet the COG's
Martin Altmann, Marcio Catelan, Manuela Zoccali
Kinematics combined with detailed element abundances provide the method of analysis of stellar populations using as much available information as possible, in contrast to other met…
Binaries among Extreme Horizontal Branch Stars in Globular Clusters
C. Moni Bidin, M. Catelan, S. Villanova +4
Following a review of our present knowledge about blue subdwarf stars in globular clusters, we present an overview of the results of searches for close binaries among these stars,…
A Search for EHB Pulsators in the Globular Cluster NGC 6752
M. Catelan, G. E. Prieto, M. Zoccali +8
We describe the status of a project whose main goal is to detect variability along the extreme horizontal branch of the globular cluster NGC 6752. Based on Magellan 6.5m data, prel…
Variable Stars in the Newly Discovered Milky Way Dwarf Spheroidal Satellite Canes Venatici I
Charles Kuehn, Karen Kinemuchi, Vincenzo Ripepi +11
We have identified 23 RR Lyrae stars and 3 possible Anomalous Cepheids among 84 candidate variables in the recently discovered Canes Venatici I dwarf spheroidal galaxy. The mean pe…
Horizontal Branch Stars and the Ultraviolet Universe
M. Catelan
Extremely hot horizontal branch (HB) stars and their progeny are widely considered to be responsible for the "ultraviolet upturn" (or UVX) phenomenon observed in elliptical galaxie…
The Peculiar Horizontal Branch Morphology of the Galactic Globular Clusters NGC 6388 and NGC 6441: new insights from UV observations
G. Busso, S. Cassisi, G. Piotto +9
In this paper we present multiband optical and UV Hubble Space Telescope photometry of the two Galactic globular clusters NGC 6388 and NGC 6441. We have obtained the first UV color…
Variable stars in the Fornax dSph Galaxy. I. The Globular Cluster Fornax 4
C. Greco, G. Clementini, M. Catelan +8
Variable stars have been identified for the first time in Fornax 4, the globular cluster located near the center of the Fornax dwarf spheroidal galaxy. By applying the image subtra…
Structure and Evolution of Low-Mass Stars: An Overview and Some Open Problems
M. Catelan
A review is presented of some of the ingredients, assumptions and techniques that are used in the computation of the structure and evolution of low-mass stars. Emphasis is placed o…
Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
S. Cassisi, A. Y. Potekhin, A. Pietrinferni +2
We review the theory of electron-conduction opacity, a fundamental ingredient in the computation of low-mass stellar models; shortcomings and limitations of the existing calculatio…