Showing 2012 · astro-ph.GAShow all

19 papers · 2 filters

astro-ph.GA2012★ 52 cited

An aluminium tool for multiple stellar generations in the globular clusters 47 Tuc and M 4

Eugenio Carretta, Raffaele Gratton, Angela Bragaglia +2

We present aluminium abundances for a sample of about 100 red giant stars in each of the Galactic globular clusters 47 Tuc (NGC 104) and M 4 (NGC 6121). We have derived homogeneous…

astro-ph.GA2012★ 35 cited

Fluorine variations in the globular cluster NGC 6656 (M22): implications for internal enrichment timescales

Valentina D'Orazi, Sara Lucatello, Maria Lugaro +8

Observed chemical (anti)correlations in proton-capture elements among globular cluster stars are presently recognized as the signature of self-enrichment from now extinct, previous…

astro-ph.GA2012★ 91 cited

Searching for multiple stellar populations in the massive, old open cluster Berkeley 39

A. Bragaglia, R. G. Gratton, E. Carretta +3

The most massive star clusters include several generations of stars with a different chemical composition (mainly revealed by an Na-O anti-correlation) while low-mass star clusters…

astro-ph.GA2012★ 42 cited

First Science with SAMI: A Serendipitously Discovered Galactic Wind in ESO 185-G031

Lisa M. R. Fogarty, Joss Bland-Hawthorn, Scott M. Croom +27

We present the first scientific results from the Sydney-AAO Multi-Object IFS (SAMI) at the Anglo-Australian Telescope. This unique instrument deploys 13 fused fibre bundles (hexabu…

astro-ph.GA2012★ 44 cited

The occurrence of nitrogen-enhanced metal-poor stars: implications for the initial mass function in the early Galactic halo

Onno R. Pols, Robert G. Izzard, Richard J. Stancliffe +1

Most carbon-enhanced metal-poor (CEMP) stars are thought to result from past mass transfer of He-burning material from an asymptotic giant branch (AGB) star to a low-mass companion…

astro-ph.GA2012★ 30 cited

The impact of thermodynamics on gravitational collapse: filament formation and magnetic field amplification

Thomas Peters, Dominik R. G. Schleicher, Ralf S. Klessen +4

Stars form by the gravitational collapse of interstellar gas. The thermodynamic response of the gas can be characterized by an effective equation of state. It determines how gas he…