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The oldest stars of the bulge: new information on the ancient Galaxy

Published online by Cambridge University Press:  02 August 2018

Gabriele Cescutti Open the ORCID record for Gabriele Cescutti [Opens in a new window] ,
Cristina Chiappini  and
Raphael Hirschi
Gabriele Cescutti
Affiliation:
I.N.A.F. Osservatorio Astronomico di Trieste, Italy; email: cescutti@oats.inaf.it
Cristina Chiappini
Affiliation:
Leibniz-Institut fuür Astrophysik Potsdam (AIP)
Raphael Hirschi
Affiliation:
Astrophysics Group, Faculty of Natural Sciences, Keele University Kavli IPMU (WPI), University of Tokyo
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Abstract

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Recently the search for the oldest stars have started to focus on the Bulge region. The Galactic bulge hosts extremely old stars, with ages compatible with the ages of the oldest halo stars. The data coming from these recent observations present new chemical signatures and therefore provide complementary constraints to those already found in the halo. So, the study of the oldest bulge stars can improve dramatically the constraints on the nature of first stars and how they polluted the pristine ISM of our Galaxy. We present our first results regarding the light elements (CNO) and the neutron capture elements. Our findings in the oldest bulge stars support the scenario where the first stellar generations have been fast rotators.

Keywords

Galaxy: bulgeGalaxy: evolutionnuclear reactionsnucleosynthesisabundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 94 - 97
Copyright
Copyright © International Astronomical Union 2018 

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