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Book Boris V. Vasiliev Astrophysics

Chapter 11 Other stars,

Chapter 11 Other stars, their classification and some cosmology The Schwarzsprung-Rassel diagram is now a generally accepted base for star classification. It seems that a classification based on the EOS of substance may be more justified from physical point of view. It can be emphasized by possibility to determine the number of classes of celestial bodies. The matter can totally have eight states (Fig.(11.1)). The atomic substance at low temperature exists as condensed matter (solid or liquid). At high temperature it transforms into gas phase. The electron -nuclear plasma can exist in four states. It can be relativistic or non-relativistic. The electron gas of non-relativistic plasma can be degenerate (cold) or non-degenerate (hot). The relativistic electron gas is degenerate at temperature below T F . Very high temperature can remove the degeneration even for relativistic electrons (if, certainly, electronic gas was not ultra-relativistic originally). In addition to that, a substance can exist as neutron matter with the nuclear density approximately. At present, assumptions about existence of matter at different states, other than the above-named, seem unfounded. Thus, these above-named states of matter show a possibility of classification of celestial bodies in accordance with this dividing. 83

Figure 11.1: The steady states of substance 84

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