Stellar parameters of MEGASTAR late-type stars

We have created MEGASTAR , an empirical library of stellar spectra obtained using MEGARA at high resolution, R=20000 (full width at half-maximum), available in two wavelength ranges: one centred on H_{alpha}_, from 6420 to 6790 {AA}; and the other centred on the Ca II triplet, from 8370 to 8885 {AA} (HR-R and HR-I volume phase holographic (VPH)-grating configurations).

In this work, we use MEGASTAR spectra, a combination of these two short wavelength intervals, to estimate the stellar parameters, namely the effective temperature, surface gravity, and metallicity (and their associated errors), for a sample of 351 MEGASTAR members with spectral types earlier than B2. We applied a {Chi}^2^-technique by comparing MEGASTAR data with theoretical stellar models. For those stars with stellar parameters derived in the literature, we obtained a good agreement between the published parameters and ours.