Computer Science
Scientific paper
Sep 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.219.1236m&link_type=abstract
Nature, Volume 219, Issue 5160, pp. 1236-1237 (1968).
Computer Science
3
Scientific paper
THE discovery in Cen XR-2 of a high temperature component with a decreasing intensity1,2 may be consistent with the proposed nova-like model of Chodil et al.3 discussed earlier by Manley4. It may have arisen as the shock from the nova expanded into a circumstellar medium of radially decreasing density. It is well known5-7 that a shock expanding into a medium with a sufficiently fast decreasing density may accelerate, so that the temperature of the shock-heated medium will increase with distance. Thus for a shock propagating into an exponential atmosphere with T(T0) the temperature at the density ρ(ρ0) ρ is a numerical factor between 1 and 1.5 and γ is the adiabatic index. For a density decreasing radially according to a power law, the corresponding temperature behaviour is where T(T0) is the temperature immediately behind the shock front at R(R0) and the density ρ~R-ω. (Note that ω > 3 for it to be interesting in this context.) By evaluating the integral which governs the volume emissivity at the frequency ν of a hot plasma with a radially varying temperature, In the limit hν > >kT0 for either circumstellar density model, it is found that the spectral index (~ 1.2) found by Lewin et al.1 is far too small to be consistent with these simple considerations.
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