Fig. 3


Comparison of the observational HR diagram in the MG vs. (BV) plane for the Hipparcos stars in Gaia DR1, using their Hipparcos (van Leeuwen 2007) parallaxes (a) and their parallaxes as listed in Gaia DR1 (b), c)). The relative standard uncertainties on the parallax are less than 20% for both the Hipparcos and Gaia DR1 parallaxes in panels a) and b), while in panel c) all stars with relative parallax uncertainties better than 20% in Gaia DR1 are shown. The stars were otherwise selected as described in the text. All panels show the stars as individual symbols where possible and where the symbols overlap the relative source density is shown, with colours varying from purple (dark) to yellow (light) indicating increasing density on a logarithmic scale. The contours enclose 10, 30, and 50 per cent of the data.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.