Isochrone fitting and Gaia results
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1) The document describes a tool called UniDAM that performs isochrone fitting to estimate stellar parameters like distance, age, and mass from photometric and spectroscopic data. 2) UniDAM fits probability density functions and provides quality flags, correlations between parameters, and open source flexibility. It uses only infrared photometry to minimize extinction effects. 3) The author has applied UniDAM to data from various surveys along with Gaia parallaxes, producing a catalog of distances, ages, and masses for 5.5 million stars.
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Isochrone fitting and Gaia results
- 1. Isochrone fitting and Gaia results UniDAM approach Alexey Mints Max-Planck Institute for Solar System Research (MPS), Goettingen, Germany August 31, 2018
- 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)
- 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)