Asteroseismology for Galactic Archaeology: bridging two fields

Transcription

1 Asteroseismology for Galactic Archaeology: bridging two fields Luca Casagrande Victor Silva Aguirre Dennis Stello, Aldo Serenelli Daniel Huber, Katie Schlesinger, Ralph Schönrich, Sofia Feltzing

2 Asteroseismology for Galactic Archaeology: bridging two fields 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

3 Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights ( ) ~40 nights (2015)

4 Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights ( ) ~40 nights (2015)

5 Isaac Newton Telescope Kepler field Kepler is dead, long live to Kepler! INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights ( ) ~40 nights (2015)

6 Isaac Newton Telescope Kepler field ~ 1000 red giants Kepler is dead, long live to Kepler! INT: 2.5 m 34 x 34 FOV Strömgren uvby ~30 nights ( ) ~40 nights (2015)

7 Image credit: NASA/JPL-Caltech

8 Image credit: NASA/JPL-Caltech

9 Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009)

10 Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009)

11 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

12 Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) AMR [Fe/H] age

13 Galactic Evolution (=baryons!) e.g. Lynden-Bell 1975, Tinsley 1980, Matteucci & Francois 1989, Chiappini et al. 1997, Schönrich & Binney (2009) AMR [Fe/H] age

14 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

15 Strömgren (uvby) [Fe/H] Broad-band photometry Teff Asteroseismology (evol. phase, Δν, νmax ) Radii, Masses, distances, ages, metallicities

16 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).

17 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).

18 Kepler selection function all stars

19 Kepler selection function V < 14

20 Kepler selection function V < giants GCS dwarfs

21 Kepler selection function V < 14 seismic -2.0 giants GCS dwarfs

22 Kepler selection function V < 14 seismic -2.0 giants unbiased sample Kepler sample GCS dwarfs ~400 red giants

23 Kepler selection function V < 14 seismic -2.0 giants unbiased sample Kepler sample GCS dwarfs ~400 red giants

24 Target selection effects

25 Stellar Mass gradient height above the Galactic plane (kpc)

26 Stellar Mass gradient height above the Galactic plane (kpc)

27 height above the Galactic plane (kpc) Age gradient

28 height above the Galactic plane (kpc) Age gradient

29 Age gradient 4 ± 2 Gyr / kpc height above the Galactic plane (kpc)

30 Age-metallicity relation NOW Lookback time

31 Age-metallicity relation NOW Lookback time

32 Age-metallicity relation NOW Lookback time

33 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