Gaia Data Release 1 contains parallaxes for more than 700 Galactic Cepheids and RR Lyrae stars, computed as part of the Tycho-Gaia Astrometric Solution (TGAS). We have used TGAS parallaxes, along with literature (V,I,J,Ks,W1) photometry and spectroscopy, to calibrate the zero point of the Period-Luminosity and Period-Wesenheit relations of classical and type II Cepheids, and the near-infrared Period-Luminosity, Period-Luminosity-Metallicity and optical Luminosity-Metallicity relations of RR Lyrae stars. In this contribution we briefly summarise results obtained by fitting these basic relations adopting different techniques that operate either in parallax or distance (absolute magnitude) space.
@article{arxiv.1704.08865,
title = {Gaia's Cepheids and RR Lyrae Stars and Luminosity Calibrations Based on Tycho-Gaia Astrometric Solution},
author = {Gisella Clementini and Laurent Eyer and Tatiana Muraveva and Alessia Garofalo and Vincenzo Ripepi and Marcella Marconi and Luis Sarro and Max Palmer and Xavier Luri and Roberto Molinaro and Lorenzo Rimoldini and Laszlo Szabados and Richard I. Anderson and Ilaria Musella},
journal= {arXiv preprint arXiv:1704.08865},
year = {2017}
}
Comments
5 pages, 4 figures, proceedings for the 22nd Los Alamos Stellar Pulsation Conference Series Meeting "Wide field variability surveys: a 21st-century perspective", held in San Pedro de Atacama, Chile, Nov. 28 - Dec. 2, 2016