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Evolution of Iron-Core White Dwarfs

1 May 2014, 22:00 UTC
Evolution of Iron-Core White Dwarfs
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Figure 1: A typical white dwarf packs as much mass as the Sun into a volume the size of Earth. With so much mass packed into such a small object, white dwarfs are incredibly dense. A teaspoon if its material would weight many tons.George C. Jordan et al. (2012) and Isern J. et al. (1991) have proposed ways that can lead to the formation of iron-core white dwarfs (WDs). A study by J. A. Panei et al. (2000) examined the structure and evolution of iron-core WDs, and found that iron-core WDs are markedly different from carbon-oxygen WDs which make up the majority of WDs. The study modelled the evolution of iron-core WDs with various masses and compositions. Also included for comparison in the study are standard carbon-oxygen WD models.Iron-core WDs with masses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 solar mass are adopted. Firstly, the models examined pure iron cores comprising 99 (pure iron model), 75, 50 and 25 per cent of the WD’s mass, with a carbon-oxygen envelop for the last 3 cases. The models then examined WDs with a homogeneous composition of iron and carbon-oxygen by adopting a mass fraction for iron of 0.25, 0.50 and ...

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