Solar neighbourhood and Galactic disc(s): New constraints

L. Casagrande*, R. Schönrich

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

We present a re-analysis of the Geneva-Copenhagen survey, based on improved effective temperature and metallicity scales, which also provide a better match to theoretical isochrones. The latter are used for a Bayesian investigation on stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shifts the peak of the metallicity distribution function around the solar value. From Strömgren photometry we are able to derive for the first time a proxy for alpha elements, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our analysis suggests a strong interplay among ages, abundances and kinematics of stars.

Original languageEnglish
Title of host publicationAssembling the Puzzle of the Milky Way
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventInternational Conference on Assembling the Puzzle of the Milky Way - Le Grand-Bornand, France
Duration: 17 Apr 201122 Apr 2011

Publication series

NameEPJ Web of Conferences
Volume19
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

ConferenceInternational Conference on Assembling the Puzzle of the Milky Way
Country/TerritoryFrance
CityLe Grand-Bornand
Period17/04/1122/04/11

Fingerprint

Dive into the research topics of 'Solar neighbourhood and Galactic disc(s): New constraints'. Together they form a unique fingerprint.

Cite this