STELLA meets RAVE: Calibrating low-resolution Ca II IRT fluxes

Within the RAVE (the Radial Velocity Experument) survey in total 574,630 low-resolution spectra of 483,330 stars covering the Ca II IRT has been obtained. With our selection criteria, out of those stars about 10% are late-type dwarfs. We have selected these dwarfs from the database, converted the measured 1-Å core equivalent widths into the fluxes, and obtained follow up high-resolution spectra of selected targets as well as spectra of MK standard stars using SES (STELLA échelle spectrograph) at STELLA (STELLar Activity) telescope. With a single exposure, we cover all wavelengths from Ca H&K to IRT and can therefore relate IRT fluxes with those of other activity indicators, such as Hα. Furthermore, we can place these fluxes in relation to observable astrophysical parameters, such as global metallicity and temperature.