Zobrazeno 1 - 10
of 474
pro vyhledávání: '"Badnell, N. R."'
We present new calculations of atomic data needed to model autoionizing states of Fe XVI. We compare the state energies, radiative and excitation data with a sample of results from previous literature. We find a large scatter of results, the most sig
Externí odkaz:
http://arxiv.org/abs/2405.01274
To calculate realistic models of objects with Ni in their atmospheres, accurate atomic data for the relevant ionization stages need to be included in model atmosphere calculations. In the context of white dwarf stars, we investigate the effect of cha
Externí odkaz:
http://hdl.handle.net/10150/623044
http://arizona.openrepository.com/arizona/handle/10150/623044
http://arizona.openrepository.com/arizona/handle/10150/623044
Plasma models built on extensive atomic data are essential to interpreting the observed cosmic spectra. H-like Lyman series and He-like triplets observable in the X-ray band are powerful diagnostic lines to measure the physical properties of various
Externí odkaz:
http://arxiv.org/abs/2210.13427
Autor:
Vieira, Nicholas, Ruan, John J., Haggard, Daryl, Ford, Nicole, Drout, Maria R., Fernández, Rodrigo, Badnell, N. R.
Freshly-synthesized r-process elements in kilonovae ejecta imprint absorption features on optical spectra, as observed in the GW170817 binary neutron star merger. These spectral features encode insights into the physical conditions of the r-process a
Externí odkaz:
http://arxiv.org/abs/2209.06951
Autor:
Badnell, N. R., Guzmán, F., Brodie, S., Williams, R. J. R., van Hoof, P. A. M., Chatzikos, M., Ferland, G. J.
Precise spectral diagnostic modelling of H~{\sc i} and He~{\sc ii} recombination spectra can constrain theoretical models which describe many astrophysical environments. Simple analytic expressions are of interest for collisional $l$-changing rate co
Externí odkaz:
http://arxiv.org/abs/2108.09166
Publikováno v:
A&A 653, A81 (2021)
Astrophysical plasma codes are built on atomic databases. In the current atomic databases, R-matrix electron-impact excitation data of O-like ions are limited. The accuracy of plasma diagnostics with O-like ions depends on the availability and accura
Externí odkaz:
http://arxiv.org/abs/2107.06975
To predict line emission in the solar atmosphere requires models which are fundamentally different depending on whether the emission is from the chromosphere or the corona. At some point between the two regions, there must be a change between the two
Externí odkaz:
http://arxiv.org/abs/2102.09278
We present here a detailed calculation of opacities for Fe~XVII at the physical conditions corresponding to the base of the Solar convection zone. Many ingredients are involved in the calculation of opacities. We review the impact of each ingredient
Externí odkaz:
http://arxiv.org/abs/2101.01788
Spectral lines from N-like ions can be used to measure the temperature and density of various types of astrophysical plasmas. The atomic databases of astrophysical plasma modelling codes still have room for improvement in their electron-impact excita
Externí odkaz:
http://arxiv.org/abs/2009.09506
The ion populations most frequently adopted for diagnostics in collisional plasmas are derived from the density independent, coronal approximation. In higher density, lower temperature conditions, ionisation rates are enhanced once metastable levels
Externí odkaz:
http://arxiv.org/abs/2007.00465