Fig. 1
The fraction of variable stars in the Hipparcos catalog based on the van Leeuwen (2007) parallax data. The bin size is 0.1 in (V − I) and 0.25 in MV. Considered are stars with an relative parallax error <0.15 and an error in (V − I) < 0.15 mag. The RGB stands out as having almost 100% variability.
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