Context. Parallaxes for 331 classical Cepheids, 31 Type II Cepheids, and 364 RR Lyrae stars in common between Gaia and the H ipparcos 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 paralla...
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