Astrophysical properties of 600 bonafide single stars in the Hyades open cluster

TL;DR

This study refines the astrophysical properties of 600 single stars in the Hyades cluster using Gaia data and stellar models, providing a benchmark for stellar evolution and exoplanet research.

Contribution

It updates the Hyades single star sequence, identifies bonafide single stars, and validates PARSEC isochrones for a specific metallicity and age.

Findings

The sequence is well-fitted by PARSEC isochrones for [M/H] = +0.18 and 775 Myr.

Mass, temperature, luminosity, and gravity are assigned to 600 stars.

The sequence serves as a benchmark for stellar models and exoplanet studies.

Abstract

The determination of the astrophysical properties of stars remains challenging, and frequently relies on the application of stellar models. Stellar sequences in nearby open clusters provide some of the best means to test and calibrate stellar evolutionary models and isochrones, and to use these models to assign astrophysical properties consistently to a large sample of stars. We aim at updating the single star sequence of members of the Hyades cluster, identifying the best-fitting isochrones, and determining the astrophysical properties of the stars. The Gaia Catalogue of Nearby Stars provides a comprehensive sample of high-probability members of the Hyades cluster. We apply a multi-step method to flag photometric outliers, and to identify bonafide single stars and likely binary and multiple systems. The single stars define a tight sequence, which in the mass range 0.12 to 2.2 Msun is well-fitted by PARSEC isochrones for a supersolar metallicity of [M/H] = +0.18 +- 0.03 and an age of 775 +- 25 Myr. The isochrones enable us to assign mass, effective temperature, luminosity, and surface gravity to each of the 600 bonafide single main-sequence stars. The observed sequence validates the PARSEC isochrones. The derived stellar properties can serve as benchmarks for atmospheric and evolutionary models, and for all-sky catalogs of stellar astrophysical properties. The stellar properties are also relevant for studies of exoplanet properties among Hyades exoplanet hosts.