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Fig. 6.


Hydrogen-rich sequences in the plane log(g)−Teff. Blue solid lines display isochrones of 0.1, 0.5, 1, 2, and 5 Gyr. Crosses indicate the location of ultra-massive white dwarfs from Mukadam et al. (2004), Nitta et al. (2016), Gianninas et al. (2011), Kleinman et al. (2013), Bours et al. (2015), Kepler et al. (2016), Curd et al. (2017).

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