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Fig. 2


HR diagram of Hipparcos stars closer than 130 pc. The top panel a) shows RAVE measurements of gravity and effective temperature, while the bottom panel b) presents the result of our calculation of the absolute J magnitude using the YY set of isochrones. Grey points are Hipparcos stars with a trigonometric distance error smaller than 20%, a spectroscopic distance error below 32% and with RAVE spectra with S / N > 40. Black points are the subset where the B10 and the three isochrone set calculations presented in this paper found a spectroscopic distance error smaller than 32%. Black and gray lines trace YY isochrones with Solar and subsolar composition and for ages between 1 and 11 Gyr with a 1 Gyr spacing. The vast majority of Hipparcos stars close enough to have accurate trigonometric parallaxes are dwarfs.

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