Stability valley for strange dwarfs |
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Authors: | Yu L Vartanyan G S Hajyan A K Grigoryan T R Sarkisyan |
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Institution: | 1. Yerevan State University, Yerevan, Armenia
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Abstract: | This is a study of the stability of strange dwarfs, superdense stars with a small self-confining core (M
core
< 0.02 M⊙) containing strange quark matter and an extended crust consisting of atomic nuclei and degenerate electron gas. The mass
and radius of these stars are of the same orders as those of ordinary white dwarfs. It is shown that any study of their stability
must examine the dependence of the mass on two variables, which can, for convenience, be taken to be the rest mass (total
baryon mass) of the quark core and the energy density ρ
tr
of the crust at the surface of the quark core. The range of variation of these quantities over which strange dwarfs are stable
is determined. This region is referred to as the stability valley for strange dwarfs. The mass and radius from theoretical
models of strange dworfs are compared with observational data obtained through the HIPPARCOS program and the most probable
candidate strange dwarfs are identified. |
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Keywords: | |
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