arXiv subjects

J. -P. Caillault

Publications and source records attributed to J. -P. Caillault.

2 recordsLinked to original sources

arXiv2000

Ages of A-type Vega-like stars from uvby$β$ Photometry

We have estimated the ages of a sample of A-type Vega-like stars by using Strömgren \emph{uvby$β} photometric data and theoretical evolutionary tracks. We find that 13 percent of these A stars have been reported as Vega-like stars in the literature and that the ages of this subset run the gamut from very young (50~Myr) to old (1~Gyr), with no obvious age difference compared to those of field A stars. We clearly show that the fractional IR luminosity decreases with the ages of Vega-like stars.

astro-ph↗

arXiv2000

Ages of late spectral type Vega-like stars

We have estimated the ages of eight late-type Vega-like stars by using standard age dating methods for single late-type stars, e.g., location on the color magnitude diagram, Li 6708 angstrom absorption, CaII H&K emission, X-ray luminosity, and stellar kinematic population. With the exception of the very unusual pre-main sequence star system HD 98800, all the late-type Vega-like stars are the same age as the Hyades cluster (600-800 Myr) or older.

astro-ph↗