GAIA FGK BENCHMARK STARS · 2015. 6. 16. · III: Jofré et al (2014) IV: Jofré et al 2015a...
Transcript of GAIA FGK BENCHMARK STARS · 2015. 6. 16. · III: Jofré et al (2014) IV: Jofré et al 2015a...
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GAIA FGK BENCHMARK STARS !
LOOKING FOR THE REPRESENTATIVES OF THE STARS IN THE MILKY WAY
PAULA JOFRE INSTITUTE OF ASTRONOMY, CAMBRIDGE !
Blanco-Cuaresma, Hawkins, Cantat-Gaudin, Nordlander, Guiglion
!!!ULRIKE HEITER (UPPSALA) CAROLINE SOUBIRAN (BORDEAUX)
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MOTIVATION
• The need of reference stars to validate/calibrate methods to analyse the Gaia-related spectroscopic surveys is evident and fundamental.
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• Accurate parallax
• Angular diameter
• Bolometric flux
• mass
!
• High-res and high SNR spectra
!
• Typical Milky Way star
!
REQUIREMENTS FOR A STAR TO BE “GRANTED" AS BENCHMARK
TEFF and LOGG from fundamental relations
Metallicity and elemental abundances from spectroscopy
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• Accurate parallax
• Angular diameter
• Bolometric flux
• mass
!
• High-res and high SNR spectra
!
• Typical Milky Way star
!
REQUIREMENTS FOR A STAR TO BE “GRANTED" AS BENCHMARK
TEFF and LOGG from fundamental relations
Metallicity and elemental abundances from spectroscopy
Stars need to be close-by, bright and with a large angular size
!Ideally seismic targets or binaries for
the mass determination !
Stars need to cover different parts of the HR diagram and have an
extended metallicity distribution
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GAIA BENCHMARK STARS FIRST SET
34 very bright and well known stars, including the Sun
Heiter et al (submitted)
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PARAMETERS
• Effective temperature and surface gravity from FUNDAMENTAL relations
!
• Metallicity and abundances from high-resolution spectroscopy combining several classical methods
I: Heiter et al 2015 (submitted) II: Blanco-Cuaresma et al (2014)
III: Jofré et al (2014) IV: Jofré et al 2015a (submitted)
…
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PRODUCTS AND APPLICATIONS
• we have fundamental Teff and logg for 34 very different stars
• we provide abundances of Fe — Mg, Ca, Si, Ti, Sc, V, Cr, Mn, Co, Ni at
• line-by-line basis
• method-by-method basis
• flags: which lines are recommended for different kind of stars
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PRODUCTS AND APPLICATIONS• we have high-resolution spectra in
long wavelength coverage : we ``create survey-like” spectra for several surveys and projects
• Gaia-ESO (Smiljanic, Recio-Blanco)
• Gaia (DPAC - CU8 - EPC)
• RAVE (Kordopatis)
• GALAH (de Silva)
• ESO - AMBRE (de Pascale)
• SDSS (Schönrich/Bergemann)
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PRODUCTS AND APPLICATIONS• we have high-resolution spectra in
long wavelength coverage : we ``create survey-like” spectra for several surveys and projects
• Gaia-ESO (Smiljanic, Recio-Blanco)
• Gaia (DPAC - CU8 - EPC)
• RAVE (Kordopatis)
• GALAH (de Silva)
• ESO - AMBRE (de Pascale)
• SDSS (Schönrich/Bergemann)
a first step towards
systematically linking/scaling the data of the
surveys
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LOOKING FOR THE BEST REPRESENTATIVE STARS IN THE MILKY WAY
what is being improved
metallicity distribution
Hawkins, Jofré, et al (soon)
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LOOKING FOR THE BEST REPRESENTATIVE STARS IN THE MILKY WAY
- some cases with uncertain
parameters - angular diameters
are not homogeneous
Heiter et al (submitted)
what is being improved
• Large observational campaigns with interferometry (CHARA and AMBER) to increase from 34 to 100 benchmark stars are on-going - so far ~20 new observations being analysed (PI: Karovicova)
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ARE THE 34 BENCHMARKS TYPICAL MILKY WAY STARS?
How many benchmark stars twins are in e.g. the Gaia-ESO Survey?
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400 pre-defined “golden" lines of 11 elements (Jofré et al 2014, 2015a) are used for finding twins
FINDING TWINS - METHOD
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FINDING TWINS - METHOD
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FINDING TWINS - METHOD
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Jofré et al 2015b (submitted) arXiv:1505.07806
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Jofré et al 2015b (submitted) arXiv:1505.07806
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DR4 MW UVES SNR>40
7000 6500 6000 5500 5000 4500 4000TEFF
5
4
3
2
1LO
G G
~800 GES MW stars
!~ 20 bmk GES
spectra !
~100 twins with 10 bmks
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DR4 MW UVES SNR>40
7000 6500 6000 5500 5000 4500 4000TEFF
5
4
3
2
1LO
G G
~800 GES MW stars
!~ 20 bmk GES
spectra !
~100 twins with 10 bmks
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DR4 MW UVES SNR>40
7000 6500 6000 5500 5000 4500 4000TEFF
5
4
3
2
1LO
G G
~800 GES MW stars
!~ 20 bmk GES
spectra !
~100 twins with 10 bmks
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TWIN DISTANCES
Jofré et al 2015b (submitted) arXiv:1505.07806
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TWIN DISTANCES
Fully independent of any
stellar modelling
Jofré et al 2015b (submitted) arXiv:1505.07806
Using a sample of ~500 HARPS Hipparcos stars
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SPACE DISTRIBUTIONtwins of benchmark stars UVES DR4
0.0 0.5 1.0 1.5 2.0 2.5 3.0Distance [Kpc]
0.0
0.2
0.4
0.6
0.8
1.0
1.2ar
bitra
ry fr
eque
ncy
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DEFINING A SCALE HOMOGENEOUSLY BECAUSE …
there is a mess in the parameters
of these well-known stars …
Heiter et al (submitted)
Jofré et al 2014
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…they produce a mess in abundances
DEFINING A SCALE HOMOGENEOUSLY BECAUSE …
Jofré et al 2015a (submitted)