Imprints of fast-rotating massive stars in the Galactic Bulge

Cristina Chiappini (), Urs Frischknecht, Georges Meynet, Raphael Hirschi, Beatriz Barbuy, Marco Pignatari, Thibaut Decressin and André Maeder
Additional contact information
Cristina Chiappini: Astrophysikalisches Institut Potsdam, An der Sternwarte 16
Urs Frischknecht: University of Basel, Klingelbergstrasse 82
Georges Meynet: Geneva Observatory, University of Geneva, 51 Ch. des Maillettes
Raphael Hirschi: Astrophysics Group, Keele University
Beatriz Barbuy: University of São Paulo, IAG, Rua do Matão 1226, Cidade Universitaria
Marco Pignatari: University of Basel, Klingelbergstrasse 82
Thibaut Decressin: Geneva Observatory, University of Geneva, 51 Ch. des Maillettes
André Maeder: Geneva Observatory, University of Geneva, 51 Ch. des Maillettes

Nature, 2011, vol. 472, issue 7344, 454-457

Abstract: Spinstars lead the way NGC 6522, the oldest globular cluster in our Galaxy, probably witnessed the earliest phases of the chemical enrichment of the Universe, when massive stars formed soon after the Big Bang generated the 'metals' (elements heavier than helium) that were incorporated into the low-mass stars that have survived to the present. However, reported element abundances in stars from NGC 6522 provided contradictory evidence about the nature of the gas from which they were formed. A reanalysis of the earlier spectra, adding yttrium and strontium abundances and upper limits for carbon, points to a pattern of abundances best explained by the early presence of metal-poor fast-rotating massive stars. These 'spinstars' are prime candidates for recognition as the 'first stars' in the Universe.

Date: 2011
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DOI: 10.1038/nature10000

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