# THE AGES OF EARLY-TYPE STARS: STRÖMGREN PHOTOMETRIC METHODS CALIBRATED, VALIDATED, TESTED, AND APPLIED TO HOSTS AND PROSPECTIVE HOSTS OF DIRECTLY IMAGED EXOPLANETS

@article{David2015THEAO,
title={THE AGES OF EARLY-TYPE STARS: STR{\"O}MGREN PHOTOMETRIC METHODS CALIBRATED, VALIDATED, TESTED, AND APPLIED TO HOSTS AND PROSPECTIVE HOSTS OF DIRECTLY IMAGED EXOPLANETS},
author={Trevor J. David and L. A. Hillenbrand},
journal={The Astrophysical Journal},
year={2015},
volume={804},
pages={146}
}
• Published 13 January 2015
• Geology, Physics
• The Astrophysical Journal
Age determination is undertaken for nearby early type (BAF) stars, which constitute attractive targets for high-contrast debris disk and planet imaging surveys. Our analysis sequence consists of acquisition of uvbyβ photometry from catalogs, correction for the effects of extinction, interpolation of the photometry onto model atmosphere grids from which atmospheric parameters are determined, and finally, comparison to the theoretical isochrones from pre-main sequence through post-main sequence…
79 Citations
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## References

SHOWING 1-10 OF 114 REFERENCES
The Geneva-Copenhagen survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
• Physics, Geology
• 2007
Context. Ages, metallicities, space velocities, and Galactic orbits of stars in the Solar neighbourhood are fundamental observational constraints on models of galactic disk evolution. Understanding
Calibration of Strömgren uvby-H$\beta$ photometry for late-type stars – a model atmosphere approach
• Physics
• 2009
Context. The use of model atmospheres for deriving stellar fundamental parameters, such as Teff ,l ogg ,a nd [Fe/H], will increase as we find and explore extreme stellar populations where empirical
Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry
• Physics, Geology
• 2005
We present a new calibration of optical (UBV, Stromgren uvbyβ, and Geneva) and near-IR (Johnson RIJHK and Two Micron All Sky Survey) photometry for B and early A stars derived from Kurucz ATLAS9
SPECTROSCOPIC PROPERTIES OF COOL STARS (SPOCS). I. 1040 F, G, AND K DWARFS FROM KECK, LICK, AND AAT PLANET SEARCH PROGRAMS
• Physics, Geology
• 2005
We present a uniform catalog of stellar properties for 1040 nearby F, G, and K stars that have been observed by the Keck, Lick, and AAT planet search programs. Fitting observed echelle spectra with
STELLAR DIAMETERS AND TEMPERATURES. I. MAIN-SEQUENCE A, F, AND G STARS
• Physics
• 2012
We have executed a survey of nearby, main-sequence A-, F-, and G-type stars with the CHARA Array, successfully measuring the angular diameters of forty-four stars with an average precision of ~1.5%.
New constraints on the chemical evolution of the solar neighbourhood and galactic disc(s) - improved astrophysical parameters for the Geneva-Copenhagen Survey
• Physics
• 2011
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
A calibration of Geneva photometry for B to G stars in terms of Teff, log g and $[M/H]$
• Geology, Physics
• 1997
We have used recent Kurucz models and numerous standard stars to improve the calibration of the Geneva photometric system proposed a few years ago. A new photometric diagram for the classification of
DIRECTLY DETERMINED LINEAR RADII AND EFFECTIVE TEMPERATURES OF EXOPLANET HOST STARS
• Physics, Geology
• 2009
We present interferometric angular sizes for 12 stars with known planetary companions, for comparison with 28 additional main-sequence stars not known to host planets. For all objects we estimate
Temperature, gravity, and bolometric correction scales for non-supergiant OB stars
Context. Precise and accurate determinations of the atmospheric parameters effective temperature and surface gravity are mandatory to derive reliable chemical abundances in OB stars. Furthermore,
STELLAR DIAMETERS AND TEMPERATURES. III. MAIN-SEQUENCE A, F, G, AND K STARS: ADDITIONAL HIGH-PRECISION MEASUREMENTS AND EMPIRICAL RELATIONS
• Physics
• 2013
Based on CHARA Array measurements, we present the angular diameters of 23 nearby, main-sequence stars, ranging from spectral types A7 to K0, 5 of which are exoplanet host stars. We derive linear