2023/11/08 by Guillermo Torres, Torres, Guillermo, R. P. Stefanik +3 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2311.05036
openalex publication_date 2023/11/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report spectroscopic observations of vB 120 (HD 30712), a 5.7 yr astrometric-spectroscopic binary system in the Hyades cluster. We combine our radial velocities with others from the literature, and with existing speckle interferometry measurements, to derive an improved 3D orbit for the system. We infer component masses of M1 = 1.065 +/- 0.018 MSun and M2 = 1.008 +/- 0.016 MSun, and an orbital parallax of 21.86 +/- 0.15 mas, which we show to be more accurate than the parallax from Gaia DR3. This is the ninth binary or multiple system in the Hyades with dynamical mass determinations, and one of the examples with the highest precision. An analysis of the spectral energy distribution yields the absolute radii of the stars, R1 = 0.968 +/- 0.012 RSun and R2 = 0.878 +/- 0.013 RSun, and effective temperatures of 5656 +/- 56 K and 5489 +/- 60 K for the primary and secondary, respectively. A comparison of these properties with the predictions of current stellar evolution models for the known age and metallicity of the cluster shows only minor differences.