Strömgren Survey for Asteroseismology and Galactic Archaeology: Let the SAGA Begin.

Research output: Contribution to journalArticle

Abstract

Asteroseismology has the capability of precisely determining stellar properties that would otherwise be inaccessible, such as radii, masses, and thus ages of stars. When coupling this information with classical determinations of stellar parameters, such as metallicities, effective temperatures, and angular diameters, powerful new diagnostics for Galactic studies can be obtained. The ongoing Stromgren survey for Asteroseismology and Galactic Archaeology has the goal of transforming the Kepler field into a new benchmark for Galactic studies, similar to the solar neighborhood. Here we present the first results from a stripe centered at a Galactic longitude of 74 degrees and covering latitude from about 8 degrees to 20 degrees, which includes almost 1000 K giants with seismic information and the benchmark open cluster NGC 6819. We describe the coupling of classical and seismic parameters, the accuracy as well as the caveats of the derived effective temperatures, metallicities, distances, surface gravities, masses, and radii. Confidence in the achieved precision is corroborated by the detection of the first and secondary clumps in a population of field stars with a ratio of 2 to 1 and by the negligible scatter in the seismic distances among NGC 6819 member stars. An assessment of the reliability of stellar parameters in the Kepler Input Catalog is also performed, and the impact of our results for population studies in the Milky Way is discussed, along with the importance of an all-sky Stromgren survey.

Details

Authors
  • L. Casagrande
  • V. Silva Aguirre
  • D. Stello
  • D. Huber
  • A. M. Serenelli
  • S. Cassisi
  • A. Dotter
  • A. P. Milone
  • S. Hodgkin
  • A. F. Marino
  • M. N. Lund
  • A. Pietrinferni
  • M. Asplund
  • Sofia Feltzing
  • C. Flynn
  • F. Grundahl
  • P. E. Nissen
  • R. Schoenrich
  • K. J. Schlesinger
  • W. Wang
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: stellar content, stars: abundances, stars: distances, stars:, fundamental parameters, stars: oscillations, surveys, techniques:, photometric
Original languageEnglish
Article number110
JournalAstrophysical Journal
Volume787
Issue number2
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes