We performed the largest and most homogeneous spectroscopic survey of field RR Lyraes (RRLs). We secured ~6300 high-resolution (HR, R~35000) spectra for 143 RRLs (111...
Spectral data used for characterization. This plots contains the blue spectra of 45 stars obtained at Pico dos Dias Observatory (black line). Main spectral lines are signaled. Red line represent the s
We present the results of high S/N long-slit spectroscopy with the Multiple Mirror (MMT) and the SAO 6-m (BTA) telescopes, optical imaging with the Wise 1-m telescope and HI...
