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Given their location on the Hertzsprung-Russell (HR) diagram, thoroughlycharacterized subgiant stars can place stringent constraints on a wide range ofastrophysical problems. Accordingly, they are prime asteroseismic targets forthe Transiting Exoplanet Survey Satellite (TESS) mission. In this work, weinfer stellar properties for a sample of 347 subgiants located in the TESSContinuous Viewing Zones (CVZs), which we select based on their likelihood ofshowing asteroseismic oscillations. We investigate how well they can becharacterized using classical constraints (photometry, astrometry), andvalidate our results using spectroscopic values. We derive luminosities,effective temperatures, and radii with mean 1$\sigma$ random (systematic)uncertainties of 4.5% (2%), 33 K (60 K), and 2.2% (2%), as well as moremodel-dependent quantities such as surface gravities, masses, and ages. We useour sample to demonstrate that subgiants are ideal targets for mass and agedetermination based on HR diagram location alone, discuss the advantages ofstellar parameters derived from a detailed characterization over widelyavailable catalogs, show that the generally used 3D extinction maps tend tooverestimate the extinction for nearby stars (distance $\lesssim$ 500 pc), andfind a correlation that supports the rotation-activity connection in post mainsequence stars. The complementary roles played by classical and asteroseismicdata sets will open a window to unprecedented astrophysical studies usingsubgiant stars.

Testing the Limits of Precise Subgiant Characterization with APOGEE and Gaia: Opening a Window to Unprecedented Astrophysical Studies