Asteroseismology for Galactic Archaeology: bridging two fields Luca Casagrande Victor Silva Aguirre Dennis Stello, Aldo Serenelli Daniel Huber, Katie Schlesinger, Ralph Schönrich, Sofia Feltzing
Asteroseismology for Galactic Archaeology: bridging two fields www.mso.anu.edu.au/saga Casagrande, Silva Aguirre, Stello et al. 2014, ApJ, 787, 110 Casagrande, Silva Aguirre, Schlesinger et al. 2015, MNRAS, submitted Luca Casagrande Victor Silva Aguirre Dennis Stello, Aldo Serenelli Daniel Huber, Katie Schlesinger, Ralph Schönrich, Sofia Feltzing
Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! WFC @ INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights (2012-2014) ~40 nights (2015)
Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! WFC @ INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights (2012-2014) ~40 nights (2015)
Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! WFC @ INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights (2012-2014) ~40 nights (2015)
Isaac Newton Telescope Kepler field ~ 1000 red giants Kepler is dead, long live to Kepler! WFC @ INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights (2012-2014) ~40 nights (2015)
Image credit: NASA/JPL-Caltech
Image credit: NASA/JPL-Caltech
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009)
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009)
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) Schönrich & Binney (2009) AMR [Fe/H] age
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) AMR [Fe/H] age
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) AMR [Fe/H] age
Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) Schönrich & Binney (2009) AMR AVR [Fe/H] age e.g. Holmberg et al. (2007), Casagrande et al. (2011) age
Strömgren (uvby) [Fe/H] Broad-band photometry Teff Asteroseismology (evol. phase, Δν, νmax ) Radii, Masses, distances, ages, metallicities
Kepler selection function: how well the red giants observed by Kepler are representative of the underlying population of giants in the field. (benchmarking against an unbiased sample). Target selection effects: once the selection function is known, how this bias the observations. (population synthesis).
Kepler selection function: how well the red giants observed by Kepler are representative of the underlying population of giants in the field. (benchmarking against an unbiased sample). Target selection effects: once the selection function is known, how this bias the observations. (population synthesis).
Kepler selection function all stars
Kepler selection function V < 14
Kepler selection function V < 14-2.0 giants GCS dwarfs
Kepler selection function V < 14 seismic -2.0 giants GCS dwarfs
Kepler selection function V < 14 seismic -2.0 giants unbiased sample Kepler sample GCS dwarfs ~400 red giants
Kepler selection function V < 14 seismic -2.0 giants unbiased sample Kepler sample GCS dwarfs ~400 red giants
Target selection effects
Stellar Mass gradient height above the Galactic plane (kpc)
Stellar Mass gradient height above the Galactic plane (kpc)
height above the Galactic plane (kpc) Age gradient
height above the Galactic plane (kpc) Age gradient
Age gradient 4 ± 2 Gyr / kpc height above the Galactic plane (kpc)
Age-metallicity relation NOW Lookback time
Age-metallicity relation NOW Lookback time
Age-metallicity relation NOW Lookback time
Conclusions ADVANCES IN GALACTIC ASTRONOMY FROM ASTEROSEISMOLOGY Vertical structure of the disk: vertical age gradient age-metallicity suggest quiescent evolution for Milky Way disc over the last 10 Gyr, thus highlighting the importance of secular processes in disc evolution