Planetary Nebulae as Possible X-ray Sources

Details Planetary Nebulae as Possible X-ray Sources Planetary Nebulae as Possible X-ray Sources

Dec 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.220.1111k&link_type=abstract

Nature, Volume 220, Issue 5172, pp. 1111 (1968).

Physics

Scientific paper

THERE is still the problem of the identification of galactic X-ray sources in the energy interval of 4-8 keV, and it seems reasonable to consider whether they can be identified with such common objects of the galactic disk as planetary nebulae. A planetary nebula is a slowly expanding gaseous shell with a very hot star inside, and in such a system X-ray emission could originate both in the nebula and in the star. We consider the nebula as a uniform spherical shell with a radius of ~ 2 × 1017 cm and mass 0.1 Msolar the radius of the central star can be taken as 1 Rsolar and its temperature as >=2 × 105 °K (ref. 1). A value of 1 kpc seems a suitable characteristic distance.

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