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Published May 10, 2015 | Published + Submitted
Journal Article Open

The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets


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 stellar evolution models, accounting for the effects of stellar rotation. We calibrate and validate our methods at the atmospheric parameter stage by comparing our results to fundamentally determined T_(eff) and log g values. We validate and test our methods at the evolutionary model stage by comparing our results on ages to the accepted ages of several benchmark open clusters (IC 2602, α Persei, Pleiades, Hyades). Finally, we apply our methods to estimate stellar ages for 3493 field stars, including several with directly imaged exoplanet candidates.

Additional Information

© 2015 The American Astronomical Society. Received 2014 October 31; accepted 2015 January 7; published 2015 May 12. The authors wish to thank John Stauffer for his helpful input on sources of uvbyβ data for open clusters and Timothy Brandt for helpful discussions during the proof stage of this work regarding the open cluster analysis, resulting in the Appendix material concerning logarithmic versus linear approaches and a modified version of Figure 17. This material is based on work supported in 2014 and 2015 by the National Science Foundation Graduate Research Fellowship under grant No. DGE1144469. This research has made use of the WEBDA database, operated at the Institute for Astronomy of the University of Vienna, as well as the SIMBAD database and VizieR catalog access tool, operated at CDS, Strasbourg, France.

Attached Files

Published - 0004-637X_804_2_146.pdf

Submitted - 1501.03154v2.pdf


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August 22, 2023
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