red giants in the gaia-eso survey...the gaia-eso survey targets & scientific goals red giants in the...
Post on 20-Feb-2021
3 Views
Preview:
TRANSCRIPT
-
Rodolfo Smiljanic&
the Gaia-ESO Survey Consortium
Dep. of AstrophysicsNicolaus Copernicus Astronomical Center
Toruń, Poland
Red Giants in theGaia-ESO Survey
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
● The Gaia-ESO Survey● Targets & Scientific Goals ● Red Giants in the Survey● Data Analyses and Data Releases● Early Results from the Sample of Giants
TOPICS
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Gaia-ESOhttp://www.gaia-eso.eu/
● Public Spectroscopic Survey
● Two Co-PIs: G. Gilmore (IoA Cambridge, UK) S. Randich (Obs. Arcetri, Italy)
● FLAMES multi-fiber facility at the 8m UT2/VLT
● Aims to observe >105 Galactic stars
● 300 nights allocated for 4 years (+ 1?)
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Gaia-ESO
● Around 300 CoIs from 90 Institutes.
● Astrophysical dataproducts to be released
● Huge collaborationwith a huge task!
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
The FLAMES Instrument
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
● A Fiber positioner with two plates (FoV of 25' diameter).● 132 fibers of 1.2 arcsec connected to Giraffe.● 8 fibers of 1.0 arcsec connected to UVES.
● Giraffe: medium-high resolution spectrograph R ~ 20000HR10, 15N, 21: λλ 533-562, 647-679, 848-900 nm
● UVES: high-resolution echelle spectrographR ~ 47000#580 nm set up (λλ 476-684 nm)
The FLAMES Instrument
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Gaia-ESOhttp://www.gaia-eso.eu/
● All Galactic components (halo, bulge, thick and thin disks)● Sample of ~100 open clusters● Selected calibration samples
● PMS, MS and Giants● OBAFGKM-types
● Multiple goals!
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Scientific Goals
● Formation and evolution of the Milky Way, its stars and stellar populations.
● Kinematics and abundances
● Dynamical evolution of open clusters (birth to disruption).
● Stellar evolution.● Halo substructures.● Nature of the bulge.● Formation of the thin
and thick disks.
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
It will observe 109 stars!!! (down to I ~ 20)
Gaia is coming!
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
● 109 objects (26 x 106 with V < 15, 250 x 106 with V < 18)
● Positions and proper motions better than 25μas at V=15● Parallax error of 25μas at V=15● RV error of 15 km/s at V=17● Thousands of OCs (mean distances to 1%)● Observations of clusters in the LMC (~ 200 μas)● 80 GCs (+1000 stars) within 10kpc (mean distances to 1%)● Discovery of 105-106 asteroids● For stars within 200 pc, discover every Jupiter size planet with
period between 1.5 - 9 years
● Spectra with R ~ 11500 of 1.5 x 108 stars with V < 17, around 870nm
What can Gaia do?
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
What can we do for Gaia?
Gaia has limited spectroscopic capabilities
● Final σRV
~ 1 km/s for a G5V star with V=14, σRV
~ 5 km/s at V = 18; for hot stars σ
RV ~ 10 km/s at V = 16.
● Estimates of [Fe/H] and [alpha/Fe] for stars brighter than V~12.
Gaia-ESO: adds the spectroscopic information.
● Better RV precision.● Detailed abundances down to V ~ 16 (UVES).● At least [Fe/H] and [alpha/Fe] down to V~19 (Giraffe) –
possibly more elements.
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
What can we do for Gaia?
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
(Gilmore et al. 2012)
-
Gaia-ESO Targets
1. Open Clusters
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
● Sample of ~100 OCs● In all phases of evolution
(~1 Myr to ~10 Gyr)● Covering the age-[Fe/H]-
radial distance-mass space● Complete members
(from OB to M-type stars)● UVES for brighter and key
objects (down to V ~ 16.5)● GIRAFFE for all others
(down to V ~ 19)
-
Gaia-ESO Targets
2. Field stars:
● Bulge: K giants (Giraffe); bright giants in low-extinction regions (UVES)
● Halo/Thick disks: mainly turn-off stars (Giraffe) giants in the outer disk, flare, warp, streams... (Giraffe)
● Thin disk: arm, inter-arm, near-bar line of sights (Giraffe only RV)
● Solar neighborhood: >5000 FG-type stars (< 2 kpc) (UVES)
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Gaia-ESO Targets
3. Calibration fields:
● Gaia Benchmark Stars (Giraffe & UVES)
● CoRoT fields (Giraffe & UVES)
● Well studied OCs and GCs (Giraffe & UVES)
● Targets of other Surveys(Giraffe & UVES)
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Benchmark Stars
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
● Used to validate the analyses
● Stars with fundamentalparameters
● Observed by GES, or from a spectral library
-
Red Giants in GES
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
● Old- and intermediate age open clusters (> 100 Myr)Clump giants with UVES
● Bulge K giants with Giraffe
● Inner disk/BulgeClump giants with UVES (search for metal-poor stars)
● Outer disk, halo-thick disk substructuresBright giants with Giraffe
● Globular clusters (calibration)UVES and Giraffe
● CoRoT fields (calibration)UVES and Giraffe
-
Analyses & Data Products
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Analyses & Data Products
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
WG11: Analyses of UVES spectra of FGK-type starsco-coordinators: A. Korn (Upsala) & R. Smiljanic (CAMK)
● 60+ people from 20+ different institutes (14 FTEs)● Analysis of 5000+ stars (giants and dwarfs, field and clusters)● ~13 different Nodes (multiple analyses)
● Receive: reduced UVES spectra, photometric information, RV and vsini.
● Deliver: atmospheric parameters, abundances, equivalent widths, chromospheric activity with errors, quality flags, and method-to-method dispersion.
● Li, C, O, Na, Mg, Al, Si, S, Ca, Ti, Cr, Ni, Zn, Y, Zr, Mo, Ce, and Dy
-
Science VerificationNumbers
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
● 6 months of data (up to June 2012)
UVES (FGK-type stars):● 421 stars with atmospheric parameters
271 MW / 98 OC / 52 CAL● 147 with log g
-
First Public ReleaseUVES FGK-type
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
Early Science
● For early science, a bit of everything was observed
● OCs: stellar evolution, internal kinematics, membership, PMS, hot-stars, etc...
● GCs: stellar evolution, GC formation● Bulge: search for metal-poor stars, inner disk chemical
composition● Thick disk: formation, scale lengths● Halo: substructures, peculiar stars
-
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
Early Science
● Stellar Evolutionwith OCs
● Abundances of Li, C, N, O, and Na
● Red: GES● Blue: Smiljanic 2012● Black: Smiljanic et al. (2009)
-
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
Early Science
● Stellar Evolutionwith OCs
● Li-rich giants in an OC
● Help to constrain the evolutionary stage ofthese objetcs.
-
Globular clusters: abundances (anti-)correlations.
● GCs for CAL. but also Science
● Red giants with UVES
● Li, C, N, O, Na, Al...
● NGC2808: [Fe/H] = -1.07, age = 12-13 Gyr
Early Science
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
-
Dig Sites of Stellar Archaeology: Giant Stars in the Milky Way, Izmir, Turkey, 4-6 Sep. 2013
Summary
● GES is an exciting project that will deliver a lot!!
● Data and results are public!● Semester releases of reduced data.● First annual release of advanced data products in ~ June 2014● Final release: Dec. 2017 or 2018 (extension?)
● Products: Atmospheric parameters, abundances, chromospheric activity, radial velocities, reduced data, auxiliary data, errors
● Many opportunities, data for different goals, OCs, GCs, MW field● OBAFGKM-type stars● Many red giants!
http://www.gaia-eso.eu/
Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29
top related