Low-temperature recombination coefficients and nova-shell abundances
نویسندگان
چکیده
منابع مشابه
Experimental N v and Ne viii low - temperature dielectronic recombination rate coefficients
The dielectronic recombination rate coefficients of N v and Ne viii ions have been measured at a heavy-ion storage ring. The investigated energy ranges covered all dielectronic recombination resonances attached to 2s → 2p (∆n = 0) core excitations. The rate coefficients in a plasma are derived and parameterized by using a convenient fit formula. The experimentally derived rate coefficients are ...
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We have carried out direct measurements of the absolute recombination rate coefficients of four charge states of tungsten in the range from W to W in a heavy ion storage ring. We find that the rich atomic fine structure of the open f -shell leads to very high resonant enhancement of the recombination rate at energies below ∼50 eV. Even in the higher energy domain relevant to fusion plasma this ...
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T Pyxidis is the prototypical recurrent nova (RN) with five eruptions from 1890 to 1967 and a mysterious nova shell. We report here on new observations of the nova shell with the Hubble Space Telescope (HST) in the year 2007, which provides a long time baseline from earlier HST images in 1994 and 1995. We find that the knots in the nova shell are expanding with velocities ranging from roughly 5...
متن کاملThe Effects of Low-Temperature Dielectronic Recombination on the Relative Populations of the Fe M-Shell States
We examine the effects of low-temperature, or ∆n = 0, dielectronic recombination (DR) on the ionization balance of the Fe M-Shell (Fe IX through Fe XVI). Since ∆n = 0 rates are not available for these ions, we have derived estimates based on the existing rates for the first four ionization states of the CNO sequence and newly calculated rates for L-shell ions of 3rd row elements and Fe. For a r...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1991
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/248.2.193