Gaia’s Cepheids and RR Lyrae stars and luminosity calibrations based on Tycho-Gaia Astrometric Solution

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...

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Main Authors: Clementini, Gisella, Eyer, Laurent, Muraveva, Tatiana, Garofalo, Alessia, Ripepi, Vincenzo, Marconi, Marcella, Sarro, Luis, Palmer, Max, Luri, Xavier, Molinaro, Roberto, Rimoldini, Lorenzo, Szabados, Laszlo, Anderson, Richard I., Musella, Ilaria
Format: Conference Proceeding
Language:English
Subjects:
Cepheid variables
Luminosity
Metallicity
Parallax
Photometry
Variable stars
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Summary: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.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201715202003