Revisiting the White Dwarf Luminosity Function from the Palomar-Green Survey
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We present updated atmospheric parameters for all DA, DB, and DO white dwarfs in the complete sample of the Palomar-Green survey. In particular, we perform a spectroscopic analysis of the DO stars using our new set of non-LTE model atmosphere calculations. We then compute an improved luminosity function of the Palomar-Green sample, including the DO stars for the first time, which allows us to study the variations in the numbers of hydrogen- and helium-atmosphere white dwarfs along a large part of the cooling sequence. We demonstrate that the so-called float-up model successfully explains the spectral evolution of the majority of white dwarfs.
The 21st European Workshop on White Dwarfs was held in Austin, TX from July 23rd to 27th of 2018