Improving the diameters of interferometric calibrators with MATISSE

Understand

A good knowledge of the angular diameters of stars used to calibrate the observables in stellar interferometry is fundamental.

• As the available precision for giant stars is worse than the required per cent level, we aim to improve the knowledge of many diameters using MATISSE (Multiple AperTure mid-Infrared SpectroScopic Experiment) data in its different instrumental configurations.
• Using the squared visibility MATISSE observable, we compute the angular diameter value, which ensures the best-fitting curves, assuming an intensity distribution of a uniform disc.
• We take into account that the transfer function varies over the wavelength and is different from one instrumental configuration to another.