PHOTO2CHEM - Stellar chemistry from photometric narrow-band imaging

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Title: Stellar chemistry from photometric narrow-band imaging

Period: 1. 7. 2019 - 31. 3. 2022

Host Institution: University of Ljubljana, Faculty of Mathematics and Physics

Principal investigator: Tomaž Zwitter

Research activity: Physics

Project description:

Strong metallic absorption lines can absorb much of the flux in a stellar atmosphere, so its metallic content can be inferred from a contrast between fluxes in narrow-band images centered on and off these lines. This classical idea has been hampered by unknown values of stellar parameters which also influence line strengths. But Gaia results published last spring accurately determine stellar temperatures and luminosities, though their chemistry remains largely unknown.

This project is a pilot observational study to check if narrow-band photometry can be used to recover chemistry of a majority of stars observed by Gaia across the parameter space and across the Galaxy, of PLATO exoplanet hosts and of the planned GaiaNIR mission targets. This study is aimed to make a critical improvement of results of the on-going Gaia mission. Its results will be important also for preparation of target lists and for interpretation of results of future missions PLATO and GaiaNIR (a successor of Gaia) for which no on-board spectroscopy is planned.