Benchmark ages for theGaiabenchmark stars

  title={Benchmark ages for theGaiabenchmark stars},
  author={Christian L Sahlholdt and Sofia Feltzing and Lennart Lindegren and Ross P. Church},
  journal={Monthly Notices of the Royal Astronomical Society},
In the era of large-scale surveys of stars in the MilkyWay, stellar ages are crucial for studying the evolution of the Galaxy.But determining ages of field stars is notoriously difficult; therefore, we attempt to determine benchmark ages for the extensively studied Gaia benchmark stars which can be used for validation purposes. By searching the literature for age estimates from different methods and deriving new ages based on Bayesian isochrone fitting, we are able to put reliable limits on the… 

Figures and Tables from this paper

Estimating the age–metallicity distribution of a stellar sample from the probability distributions of the individual stars
Estimating age distributions, or star formation histories, of stellar populations in the Milky Way is important in order to study the evolution of trends in elemental abundances and kinematics. We
Testing abundance-age relations beyond solar analogues with Kepler LEGACY stars
The prospects of using abundance ratios as stellar age indicators appear promising for solar analogues, but the usefulness of this technique for stars spanning a much wider parameter space remains to
Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings
A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain
The local and distant Universe: stellar ages and H0
The ages of the oldest stellar objects in our galaxy provide an independent test of the current cosmological model as they give a lower limit to the age of the Universe. Recent accurate parallaxes by
Inferring the age of the universe with globular clusters
We present an estimate of the absolute age of 68 galactic globular clusters obtained by exploiting the distribution of stars in the full color-magnitude diagram. In particular, we jointly estimate
Weighing stars from birth to death: mass determination methods across the HRD
The mass of a star is the most fundamental parameter for its structure, evolution, and final fate. It is particularly important for any kind of stellar archaeology and characterization of exoplanets.
On the Origin of Metal-poor Stars in the Solar Neighborhood
We determined the ages, kinematic parameters, and Galactic orbital parameters of six metal-poor (−2.4 < [Fe/H] < −1.0 dex), F-type, high-proper-motion (HPM) stars to investigate their HPM nature and
Revisiting the mass- and radius–luminosity relations for FGK main-sequence stars
Context. Scaling relations are very useful tools for estimating unknown stellar quantities. Within this framework, eclipsing binaries are ideal for this goal because their mass and radius are known
The GALAH survey: multiple stars and our Galaxy
Context. Binary stellar systems form a large fraction of the Galaxy’s stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken
Constraining churning and blurring in the Milky Way using large spectroscopic surveys – an exploratory study
We have investigated the possibilities to quantify how much stars move in the Milky Way disc due to diffuse processes (blurring) and due to influences from spiral arms and the bar (churning). We


Revising the ages of planet-hosting stars
Aims. This article aims to measure the age of stars with planets (SWP) through stellar tracks and isochrones computed with the PAdova and TRieste Stellar Evolutionary Code (PARSEC). Methods. We
The Ages of Stars
The age of an individual star cannot be measured, only estimated through mostly model-dependent or empirical methods, and no single method works well for a broad range of stellar types or for a full
Determination of stellar ages from isochrones: Bayesian estimation versus isochrone fitting
We present a new method, using Bayesian estimation, to determine stellar ages and their uncertainties from observational data and theoretical isochrones. The result for an individual star is obtained
Estimating stellar ages and metallicities from parallaxes and broadband photometry: successes and shortcomings
A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain
The Influence of Atomic Diffusion on Stellar Ages and Chemical Tagging
In the era of large stellar spectroscopic surveys, there is an emphasis on deriving not only stellar abundances but also the ages for millions of stars. In the context of Galactic archeology, stellar
Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors
We here develop an improved way of using a rotating star as a clock, set it using the Sun, and demonstrate that it keeps time well. This technique, called gyrochronology, derives ages for low-mass
An Assessment of the Rotation Rates of the Host Stars of Extrasolar Planets
The rotation periods of the host stars of extrasolar planets have been assessed against those of the Mount Wilson stars, open cluster stars, and evolutionary stellar models that include rotation.
Weakened magnetic braking as the origin of anomalously rapid rotation in old field stars
Stellar evolutionary modelling is reported, and the presence of unexpectedly rapid rotation in stars that are more evolved than the Sun is confirmed, suggesting a fundamental change in the nature of ageing stellar dynamos.
Effective temperatures of red giants in the APOKASC catalogue and the mixing length calibration in stellar models
Red giants in the updated APOGEE-Kepler catalogue, with estimates of mass, chemical composition, surface gravity and effective temperature, have recently challenged stellar models computed under the
Basic physical parameters of a selected sample of evolved stars
We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the