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Title: Fundamental effective temperature measurements for eclipsing binary stars
Speaker: Nikki Miller
Affiliation: Uppsala University
Time: Thursday 5th September 2024, 14:00 to 15:00
Location: 101136A Å
Abstract: Recent advancements in instrumentation and techniques have significantly improved the accuracy and precision of mass and radius measurements for stars in double-lined detached eclipsing binary (DEB) systems, with uncertainties in both properties now reaching less than 0.2%. Such improvements have been made possible by the availability of space-based photometry from TESS, Kepler and CHEOPS (e.g. Maxted et al. 2020), along with stable, high resolution spectroscopy. Reliable measurements of this quality make double-lined DEBs strong candidate benchmark stars that may be used for testing and calibrating a wide range of models, methods and pipelines, for example, in the upcoming PLATO mission. Unfortunately, the accuracy of the effective temperature (Teff) has been trailing behind other parameters, with inhomogeneity, inconsistencies between methods and large systematic errors on the order of 100K or more being common (see Jofré et al. 2019; Tayar et al. 2022). Work towards a consistent Teff scale for stars with a range of masses and ages is therefore both timely and essential, in order to provide the best possible benchmark sample of DEBs for upcoming missions and large-scale surveys. In this talk, I will present a recently-developed method for measuring Teff for FGKM-type stars in DEBs, using high-quality light curves, Gaia astrometry, and spectrophotometry. This method, first published in Miller et al. (2020), derives Teff directly from angular diameter and bolometric flux, with robust uncertainty estimates from MCMC. I will present results for the sample of DEBs analysed using this method so far, covering a range of spectral types, which will form the basis of a benchmark sample of stars in DEBs with very precise, accurate and homogeneous mass, radius and Teff measurements.