Isochrone fitting done with Gaia DR2 parallaxes properly included. Made with UniDAM tool.

1. Isochrone fitting and Gaia results
UniDAM approach
Alexey Mints
Max-Planck Institute for Solar System Research (MPS), Goettingen, Germany
August 31, 2018

2. Spectroscopic surveys
Alexey Mints 2/12

3. Isochrone fitting: classical approach
Teff
log g
[Fe/H]
J, H, Ks
Alexey Mints 3/12

4. Isochrone fitting: classical approach
Models
Teff
log g
[Fe/H]
J, H, Ks
Alexey Mints 3/12

5. Isochrone fitting: classical approach
Models
Teff
log g
[Fe/H]
J, H, Ks
mass
age
d
π
AV
Alexey Mints 3/12

6. Isochrone fitting problem
Alexey Mints 4/12
Credit: Jorgensen and
Lindegren (2005)

7. Isochrone fitting: PDF
Alexey Mints 5/12

8. What we do differently
UniDAM – Unified tool for Distance, Age and Mass estimation.
Separate solutions
Fits to probability density functions
Quality flags and best-fit probabilities
Correlations between age, distance and mass
Alexey Mints 6/12
Mints, Hekker (2017)

9. Parameter correlations
Alexey Mints 6/12

10. What we do differently
UniDAM – Unified tool for Distance, Age and Mass estimation.
Separate solutions
Fits to probability density functions
Quality flags and best-fit probabilities
Correlations between age, distance and mass
Only IR-photometry (2MASS, AllWISE)
Alexey Mints 7/12
Mints, Hekker (2017)

11. Why infra-red photometry?
Forbes effect: magnitude change is a non-linear function of
extinction:
m ∝ −2.5 log (F(λ)−AλExt(λ))t(λ)dλ = −2.5 log F(λ)t(λ)dλ+Aλ
Alexey Mints 7/12

12. What we do differently
UniDAM – Unified tool for Distance, Age and Mass estimation.
Separate solutions
Fits to probability density functions
Quality flags and best-fit probabilities
Correlations between age, distance and mass
Only IR-photometry (2MASS, AllWISE)
Open source tool (published on GitHub)
Flexibility in input/output parameter choice
Alexey Mints 8/12
Mints, Hekker (2017)

13. Isochrone fitting with Gaia data
Models
Teff
log g
[Fe/H]
J, H, Ks
mass
age
d
π
AV
Alexey Mints 9/12

14. Distance and age precision with Gaia DR2
RAVE
Alexey Mints 10/12
Mints, Hekker (2018)

15. Catalogue
Distance, log(age), mass for 5.5 million stars from APOGEE,
GALAH, LAMOST, RAVE, SEGUE.
Alexey Mints 11/12

16. Catalogue
Distance, log(age), mass for 5.5 million stars from APOGEE,
GALAH, LAMOST, RAVE, SEGUE.
Alexey Mints 11/12

17. Catalogue
Distance, log(age), mass for 5.5 million stars from APOGEE,
GALAH, LAMOST, RAVE, SEGUE.
Alexey Mints 11/12

18. Catalogue
Distance, log(age), mass for 5.5 million stars from APOGEE,
GALAH, LAMOST, RAVE, SEGUE.
Alexey Mints 11/12

19. Summary and outlook
Summary
UniDAM – flexible open source isochrone fitting tool.
Catalogue of distances, ages and masses for 5,5 millions
stars with Gaia DR2 parallaxes.
Detailed PDF information for every solution.
Alexey Mints 12/12
Mints, Hekker (2018)

20. Summary and outlook
Summary
UniDAM – flexible open source isochrone fitting tool.
Catalogue of distances, ages and masses for 5,5 millions
stars with Gaia DR2 parallaxes.
Detailed PDF information for every solution.
Future
New parameters: [α/Fe], νmax, δν.
Gaia-based extinctions.
Alexey Mints 12/12
Mints, Hekker (2018)