New constraints on the chemical evolution of the solar neighbourhood and galactic disc(s) - improved astrophysical parameters for the Geneva-Copenhagen Survey

By Luca Casagrande, R. Schoenrich, Martin Asplund, Santi Cassisi, I. Ramírez, Jorge Meléndez, T. Bensby, S. Feltzing. 2011

651 citations recorded by the source corpus.

We present a re-analysis of the Geneva-Copenhagen survey, which benefits from the infrared flux method to improve the accuracy of the derived stellar effective temperatures and uses the latter to build a consistent and improved metallicity scale. Metallicities are calibrated on high-resolution spectroscopy and checked against four open clusters and a moving group, showing excellent consistency. The new temperature and metallicity scales provide a better match to theoretical isochrones, which are used for a Bayesian analysis of stellar ages. With respect to previous analyses, our stars are on average 100 K hotter and 0.1 dex more metal rich, which shift the peak of the metallicity distribution function around the solar value. From Stromgren photometry we are able to derive for the first time a proxy for [alpha/Fe] abundances, which enables us to perform a tentative dissection of the chemical thin and thick disc. We find evidence for the latter being composed of an old, mildly but systematically alpha-enhanced population that extends to super solar metallicities, in agreement with spectroscopic studies. Our revision offers the largest existing kinematically unbiased sample of the solar neighbourhood that contains full information on kinematics, metallicities, and ages and thus provides better constraints on the physical processes relevant in the build-up of the Milky Way disc, enabling a better understanding of the Sun in a Galactic context. (Less)

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/698b8710f4b10c11446fef58c8acf131df221218

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Citations in the corpus

The Galaxy in Context: Structural, Kinematic, and Integrated Properties (2016, methodology): “From existing data, it is very difficult to distinguish a continually rising AVR from one that steps or saturates at old ages (Aumer & Binney 2009, Casagrande et al. 2011).”
Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes (2017, methodology): “…distribution functions for each stellar parameter were then obtained by weighting ( ∣ )p y x by the volume thateach isochrone point encompasses in mass, age, metallicity, and AV, and integrating the resulting distribution along a given stellar parameter (see Appendix A of Casagrande et al. 2011).”
The Milky Way’s stellar disk (2013, background): “Casagrande et al. (2011) also showed that precise Strömgren photometry can constrain [α/Fe] to ≃ 0.1 dex.”
FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 428 LIKELY FALSE POSITIVES (2016, methodology): “Priors used in these fits are listed in Table 1—notably, we use a prior on [Fe/H] based on a double-Gaussian fit to the local metallicity distribution (Hayden et al. 2015; Casagrande et al. 2011).”
THE K2 ECLIPTIC PLANE INPUT CATALOG (EPIC) AND STELLAR CLASSIFICATIONS OF 138,600 TARGETS IN CAMPAIGNS 1–8 (2015, methodology): “Note that the volume in age, mass and metallicity covered by each isochrone point (which is required to take into account different evolutionary speeds, see Casagrande et al. 2011; Serenelli et al. 2013) are taken into account through the sampling process used to generate the Galaxia population.”
REVISED STELLAR PROPERTIES OF KEPLER TARGETS FOR THE QUARTER 1–16 TRANSIT DETECTION RUN (2013, methodology): “Matching observations to stellar isochrones is a non-trivial task, with important systematics such as the terminal age bias (Pont & Eyer 2004; Jørgensen & Lindegren 2005; Casagrande et al. 2011; Serenelli et al. 2013).”
Impacts of a flaring star-forming disc and stellar radial mixing on the vertical metallicity gradient (2016, result): “On the other hand, the dispersion of the metallicity distribution function (MDF) increases, which is qualitatively consistent with the observed MDF for different ages of stars in the solar neighbourhood (Casagrande et al. 2011).”
Chemodynamical evolution of the Milky Way disk - I. The solar vicinity (2012, methodology): “It can be seen that the MDF peak shifts from solar at low heights from the plane (consistent with the GCS sample, e.g., Casagrande et al. 2011), to a value below solar, because we selected only particles with heights above 500 pc (consistent with RAVE – Boeche et al. 2013 and SEGUE – Bovy et al.…”
AN ANCIENT EXTRASOLAR SYSTEM WITH FIVE SUB-EARTH-SIZE PLANETS (2015, methodology): “This is in fair agreement with a proxy value of 0.17± 0.10 dex from Strömgren photometry (Casagrande et al. 2011).”
Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys (2018, background): “The profile of the [Fe/H] distribution in the solar neighbourhood has been widely studied (e.g. van den Bergh 1962; Nordström et al. 2004; Casagrande et al. 2011).”
The Solar Twin Planet Search. I. Fundamental parameters of the stellar sample (2014, background): “Isochrone age determinations are subject to a number of sampling biases whose impact can be minimized using Bayesian statistics (e.g., Pont & Eyer 2004; Jørgensen & Lindegren 2005; da Silva et al. 2006; Casagrande et al. 2011).”
THE METALLICITY DISTRIBUTION FUNCTIONS OF SEGUE G AND K DWARFS: CONSTRAINTS FOR DISK CHEMICAL EVOLUTION AND FORMATION (2011, methodology): “The GCS sample is limited to 200 pc from the Sun (Casagrande et al. 2011).”
3D maps of the local ISM from inversion of individual color excess measurements (2013, positive): “We, then, added the catalog of color excess and distances derived for the target stars from the latest revision of the Geneva-Copenhagen Survey (Nordström et al.(2004), Casagrande et al.(2011)).”
The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data (2017, methodology): “1 http://freeeos.sourceforge.net/ To validate the version of Elli used in this paper, we used the Elli age measurements for the sample of Casagrande et al. (2011), and Fig.”
Chemodynamics of the Milky Way - I. The first year of APOGEE data (2013, methodology): “25 However, the photometric [α/Fe] estimates for the GenevaCopenhagen survey used by Boeche et al. (2013b) are from Casagrande et al. (2011), and should only be treated as proxies for [α/Fe].”
Gaia Data Release 2 (2018, methodology): “The left panel c compares our luminosities with those derived from the bolometric flux estimates from Casagrande et al. (2011).”
How to Constrain Your M Dwarf. II. The Mass–Luminosity–Metallicity Relation from 0.075 to 0.70 Solar Masses (2018, methodology): “For the other two, we took [Fe/H] values from Casagrande et al. (2011) and Torres et al. (2010), respectively.”