Speaker
Description
Accurate measurements of white dwarfs masses are needed for determining the amount of gas recycled in the Galaxy, and, when measured through gravitational
redshift, establish a firm comparison between quantum mechanics and general relativity predictions.
We use the accurate ESPRESSO spectrograph at the VLT to determine Doppler shifts and gravitational redshifts for 8 bona fide Hyades white dwarfs, with an
accuracy of better than 1.5$\%$. By comparing the gravitational redshift M/R measurements with those derived by fitting the Gaia color - magnitude
diagram with theoretical models, we find that the models and the observed M/R ratios globally agree extremely well, to better than 1%. By comparing photometric and spectroscopic Teff, we confirm that spectroscopic Teff are systematically larger, producing larger masses and smaller radii than what
found in our analysis.
