Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159..202t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 202-208. Research supported by the Nuffield Found
Astronomy and Astrophysics
Astrophysics
13
Stellar Mass Accretion, Stellar Models, White Dwarf Stars, X Ray Sources, Bombardment, Coulomb Collisions, Shock Waves
Scientific paper
The problem of the observed low ratio of hard to soft X-rays in accreting white dwarfs, with low accretion rate (e.g. AM Her), is discussed in terms of models where the accreting matter is treated as a nonthermal stream bombarding a static atmosphere cooled by optically thin radiation (Kuijpers and Pringle, 1982). It is shown that the proton collisional mean free path used by Kuijpers and Pringle (1982) was inappropriate for the inferred temperature regime and that when the correct expression is used the global mean temperature of a steady state bombardment solution is much lower (about 10 to the 5 K) and much closer to observations. It is seen that no steady state solution is possible without invoking some other kind of energy transport mechanism; such bombardment models cannot explain the 'soft X-ray puzzle'. The shock solution of Frank and King (1984) - and its failure to solve the puzzle - are discussed.
Brown John C.
Kuijpers Jan
Thompson Maggie A.
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