The Geneva-Copenhagen survey of the solar neighbourhood III. Improved distances, ages, and kinematics

By J. Holmberg, B. Nordström, J. Andersen. 2008

190 citations recorded by the source corpus.

Context. Ages, chemical compositions, velocity vectors, and Galactic orbits for stars in the solar neighbourhood are fundamental test data for models of Galactic evolution. The Geneva-Copenhagen Survey of the Solar Neighbourhood (Nordstrom et al. 2004; GCS), a magnitude-complete, kinematically unbiased sample of 16 682 nearby F and G dwarfs, is the largest available sample with complete data for stars with ages spanning that of the disk. Aims. We aim to improve the accuracy of the GCS data by implementing the recent revision of the Hipparcos parallaxes. Methods. The new parallaxes yield improved astrometric distances for 12 506 stars in the GCS. We also use the parallaxes to verify the distance calibration for uvbyβ photometry by Holmberg et al. (2007, AA GCS II). We add new selection criteria to exclude evolved cool stars giving unreliable results and derive distances for 3580 stars with large parallax errors or not observed by Hipparcos. We also check the GCS II scales of Teff and [Fe/H] and find no need for change. Results. Introducing the new distances, we recompute MV for 16 086 stars, and U, V, W, and Galactic orbital parameters for the 13 520 stars that also have radial-velocity measurements. We also recompute stellar ages from the Padova stellar evolution models used in GCS I-II, using the new values of MV , and compare them with ages from the Yale-Yonsei and Victoria-Regina models. Finally, we compare the observed age-velocity relation in W with three simulated disk heating scenarios to show the potential of the data. Conclusions. With these revisions, the basic data for the GCS stars should now be as reliable as is possible with existing techniques. Further improvement must await consolidation of the Teff scale from angular diameters and fluxes, and the Gaia trigonometric parallaxes. We discuss the conditions for improving computed stellar ages from new input data, and for distinguishing different disk heating scenarios from data sets of the size and precision of the GCS.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/d9bdd4c6106d2e2bc3c7811ff17f511ddc76c966

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Citations in the corpus

Accurate fundamental parameters for 23 bright solar-type stars (2010, methodology): “A further examination of the Holmberg et al. (2007) calibration was done by Holmberg et al. (2009).”
THE METALLICITY DISTRIBUTION FUNCTIONS OF SEGUE G AND K DWARFS: CONSTRAINTS FOR DISK CHEMICAL EVOLUTION AND FORMATION (2011, methodology): “Work such as the Geneva–Copenhagen Survey (GCS) of the solar neighborhood (Jørgensen 2000; Nordström et al. 2004; Holmberg et al. 2007, 2009; Casagrande et al. 2011) indicated that for a large volume-complete and kinematically unbiased sample, the simple closed box model overpredicted the number…”
A NEW MECHANISM FOR RADIAL MIGRATION IN GALACTIC DISKS: SPIRAL–BAR RESONANCE OVERLAP (2009, unknown): “Because of the age-velocity relation (AVR), where older stellar samples are observed to have higher velocity dispersion than younger ones (e.g. Holmberg et al. 2009), stars from the inner and outer Milky Way (MW) disk can enter the SN and thus blur the expected AMR.”
New constraints on the chemical evolution of the solar neighbourhood and galactic disc(s) - improved astrophysical parameters for the Geneva-Copenhagen Survey (2011, methodology): “The original catalogue (Nordström et al. 2004, GCSI) has undergonea number of revisions to improve the temperature and metallicity calibrations (Holmberg et al. 2007, GCSII) and to account for the new reduction of theHipparcos parallaxes (Holmberg et al. 2009, GCSIII).”
The Gaia-ESO Survey : radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk (2014, background): “Also, Feltzing et al. (2001), and later the Geneva-Copenhagen Survey (Nordström et al. 2004; Holmberg et al. 2007, 2009; Casagrande et al. 2011), found a large scatter in metallicity at all ages, and confirmed the tentative existence of an old metal-rich population.”
THE MILKY WAY TOMOGRAPHY WITH SDSS. III. STELLAR KINEMATICS (2009, background): “HIPPARCOS stars with full three-dimensional velocity information, Nordström et al. (2004), Famaey et al. (2005), and Holmberg et al. (2007, 2009) have detected the same kinematic morphology.”
EVOLVING GRAVITATIONALLY UNSTABLE DISKS OVER COSMIC TIME: IMPLICATIONS FOR THICK DISK FORMATION (2011, unknown): “The velocity dispersions of stars in the solar neighborhood vary from about 17 km/s for 1 Gyrold stars to ∼ 10 Gyr-old stars with σ∗ ≈ 37 km/s (Nordström et al. 2004; Holmberg et al. 2009).”
STARS, GAS, AND DARK MATTER IN THE SOLAR NEIGHBORHOOD (2015, background): “The velocity dispersion of stars is observed to increase with age; from an analysis of the 16682 nearby F and G dwarfs in the Geneva–Copenhagen Survey of the Solar Neighborhood (Nordström et al. 2004), Holmberg et al. (2009) found that the vertical velocity dispersion, Ws , increases as age t t0.”
DIRECT IMAGING OF A COLD JOVIAN EXOPLANET IN ORBIT AROUND THE SUN-LIKE STAR GJ 504 (2013, background): “In light of these large discrepancies, it is unsurprising that literature estimates for the isochronal age of GJ 504 vary strongly from hundreds of Myrs to several Gyrs (e.g., Valenti & Fischer 2005; Takeda et al. 2007; Holmberg et al. 2009; da Silva et al. 2012).”
The Lives of Stars: Insights from the TGAS–RAVE–LAMOST Data Set (2018, methodology): “Our values are similar to those found by Binney et al. (2000) using Hipparcos data, Aumer & Binney (2009) using Hipparcos data combined with Geneva-Copenhagen Survey radial velocities, and Holmberg et al. (2009) again with Geneva-Copenhagen Survey and Hipparcos data (see Equation 13).”
An absolutely calibrated T eff scale from the infrared flux method. Dwarfs and subgiants (2010, background): “…temperature scale adopted by Holmberg et al. (2006) favours bluer colours, which are grossly compensated to the red by the underestimation of∼ 0.1 dex in the GCS photometric metallicities with respect to spectroscopic ones selected to be consistent with our temperature scal (Holmberg et al. 2009).”