publication 21-March-2018 23:35:19

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

Publication date: 13 December 2017

Authors: Gaia Collaboration

Journal: Astronomy & Astrophysics
Volume: 605
Page: A79
Year: 2017

Copyright: ESO

Context. 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). Aims: In order to test these first parallax measurements of the primary standard candles of the cosmological distance ladder, which involve astrometry collected by Gaia during the initial 14 months of science operation, we compared them with literature estimates and derived new period-luminosity (PL), period-Wesenheit (PW) relations for classical and Type II Cepheids and infrared PL, PL-metallicity (PLZ), and optical luminosity-metallicity (MV-[Fe/H]) relations for the RR Lyrae stars, with zero points based on TGAS.

[Remainder of abstract truncated due to character limitations]

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Last Update: 13 December 2017

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