APO ACCELS. Ages, Li EW, & Prot for 166 accel. stars

Potential benchmark companions can be identified from astrometric accelerations of their host stars. We use Gaia DR3 and Hipparcos astrometry to identify 166 northern hemisphere stars with astrometric accelerations consistent with a substellar companion between 0.5" and 1".

For this accelerating sample we identify young stars using Apache Point Observatory/ARCES spectra and TESS light curves. From spectroscopic screening of the sample, we measure ages for 24 stars with detectable amounts of lithium, place lower age limits on 135 stars with lithium nondetections, and measure ages from R'_HK_ for 34 stars. A total of 129 stars have TESS light curves, from which we measure ages for 20 stars with rotation rates <15days, and we identify three eclipsing binaries.