# Gaia Data Release 1. Testing parallaxes with local Cepheids and RR Lyrae stars

title={Gaia Data Release 1. Testing parallaxes with local Cepheids and RR Lyrae stars},
journal={Astronomy and Astrophysics},
year={2017},
volume={605},
pages={1-29}
}
• Published 1 May 2017
• Physics
• Astronomy and Astrophysics
Parallaxes for 331 classical Cepheids, 31 Type II Cepheids and 364 RR Lyrae stars in common between Gaia and the Hipparcos and Tycho-2 catalogues are published in Gaia Data Release 1 (DR1) as part of the Tycho-Gaia Astrometric Solution (TGAS). In order to test these first parallax measurements of the primary standard candles of the cosmological distance ladder, that involve astrometry collected by Gaia during the initial 14 months of science operation, we compared them with literature estimates…
The Cepheid period–luminosity–metallicity relation based on Gaia DR2 data
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• Physics
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• Physics
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• 2018
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• Physics
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• Physics
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