Fig. 18.
Top: absolute V magnitudes computed from HIPPARCOS photometry but with Gaia DR2 parallaxes (MV = HPmag + 5log(Plx/100)) as a function of the HIPPARCOS B − V colour of 74 Ap stars with positive parallaxes in both catalogues. The symbols are the same as used in Figs. 12 and 15. Bottom: HIPPARCOS parallaxes HPlx were used to compute the absolute magnitudes (MV = HPmag + 5log(HPlx/100)). The labelled object (HD 81009) is not shown in the top panel because its Gaia DR2 parallax is negative.
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.