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The properties of cool DZ white dwarfs

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Figure

Figure 1.1:The white dwarf mass-radius relation as first presented by Chan-drasekhar (1935)
Figure 1.2:Chemical stratification of a carbon-oxygen white dwarf with a hydrogendominated atmosphere.Almost all of the mass is contained within carbon andoxygen, with helium contributing about 1 % of the total mass, and hydrogen onlyone part in 104
Figure 1.5:(Top/Middle) The first spectrum of vMa2 (van Maanen, 1917) wastaken by Walter Adams and classified as an F-type star due to the prominent CaH+K absorption lines, still visible on the original plate almost one century later.(Bottom) A more recent U
Figure 1.6:Beyond about 1.5that expected for a 12 000 K white dwarf alone. Photometric points are the original µm, G 29−38 exhibits a large flux excess compared todata presented by Zuckerman & Becklin (1987).
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