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On the alleged duality of the Galactic halo
Ralph Schoenrich, Martin Asplund, Luca Casagrande
We examine the kinematics of the Galactic halo based on SDSS/SEGUE data by Carollo et al. (2007, 2010). We find that their claims of a counter-rotating halo are the result of subst…
Fiducial Stellar Population Sequences for the VJKs Photometric System
Crystal Brasseur, Peter B. Stetson, Don A. VandenBerg +3
We have obtained broad-band near-infrared photometry for seven Galactic star clusters (M92, M15, M13, M5, NGC1851, M71 and NGC6791) using the WIRCam wide-field imager on the Canada…
Observational evidence for a broken Li Spite plateau and mass-dependent Li depletion
Jorge Melendez, Luca Casagrande, Ivan Ramirez +2
We present NLTE Li abundances for 88 stars in the metallicity range -3.5 < [Fe/H] < -1.0. The effective temperatures are based on the infrared flux method with improved E(B-V) valu…
Revisiting Delta Y/Delta Z from multiple main sequences in Globular Clusters: insight from nearby stars
Laura Portinari, Luca Casagrande, Chris Flynn
For nearby K dwarfs, the broadening of the observed Main Sequence at low metallicities is much narrower than expected from isochrones with the standard helium-to-metal enrichment r…
An absolutely calibrated effective temperature scale from the InfraRed Flux Method
L. Casagrande, I. Ramirez, J. Melendez +2
Various effective temperature scales have been proposed over the years. Despite much work and the high internal precision usually achieved, systematic differences of order 100 K (o…