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Stars as Laboratories for Fundamental Physics - MPP Theory Group

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Anomalous Stellar Energy Losses Bounded by Observations 55<br />

a point at which photon emission from the surface becomes the dominant<br />

<strong>for</strong>m of cooling. In Fig. 2.14 the central temperature, surface<br />

temperature, neutrino luminosity, and photon luminosity are shown <strong>as</strong><br />

functions of age according to a numerical calculation of Nomoto and<br />

Tsuruta (1987).<br />

Fig. 2.14. Cooling of a neutron star with baryon m<strong>as</strong>s 1.4 M ⊙ (gravitational<br />

m<strong>as</strong>s 1.3 M ⊙ ) according to Nomoto and Tsuruta (1987). The solid line is<br />

<strong>for</strong> an equation of state of intermediate stiffness (model FP), the dotted<br />

line <strong>for</strong> a stiff model (PS). All “nonstandard” effects were ignored such <strong>as</strong><br />

nucleon superfluidity, a meson condensate, magnetic fields, and so <strong>for</strong>th.<br />

Temperatures and luminosities are local, ignoring the gravitational redshift.

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