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Signatures of an Intermediate-Age Metal-Rich Bulge Population

In English

Författare

  • Thomas Bensby
  • Sofia Feltzing
  • A. Gould
  • J. A. Johnson
  • M. Asplund
  • Daniel Adén
  • J. Melendez
  • J. G. Cohen
  • I. Thompson
  • S. Lucatello
  • A. Gal-Yam
Visa allt

Summary, in English

We have determined detailed elemental abundances and stellar ages for a sample of now 38 microlensed dwarf and subgiant stars in the Galactic bulge. Stars with sub-solar metallicities are all old and have enhanced alpha-element abundances - very similar to what is seen for local thick disk stars. The metal-rich stars on the other hand show a wide variety of stellar ages, ranging from 3-4 Gyr to 12 Gyr, and an average around 7-8 Gyr. The existence of young and metal-rich stars are in conflict with recent photometric studies of the bulge which claim that the bulge only contains old stars.

Publiceringsår

2012

Språk

Engelska

Sidor

203-204

Publikation/Tidskrift/Serie

Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)

Volym

458

Dokumenttyp

Konferensbidrag

Förlag

Astronomical Society of the Pacific (ASP)

Ämne

  • Astronomy, Astrophysics and Cosmology

Conference name

Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way

Conference date

2011-11-01 - 2011-11-04

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 978-1-58381-798-8