کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1764693 | 1020068 | 2014 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Stark widths of Ar III spectral lines in the atmospheres of subdwarf B stars Stark widths of Ar III spectral lines in the atmospheres of subdwarf B stars](/preview/png/1764693.png)
Using semiclassical perturbation approach in impact approximation, we have calculated Stark widths for 32 spectral lines of doubly charged argon (Ar III). Oscillator strengths are calculated using Hartree–Fock method with relativistic correction (HFR) and an atomic model including 17 configurations. Energy levels are taken from NIST database. For perturbing levels for which the corresponding energy does not exist in NIST database, the calculated energies are used. Our widths are compared with the experimental results. The results presented here are of interest for modelling and investigation of stellar atmospheres since argon in different ionization stages is observed in many astrophysical objects. Finally, the importance of Stark broadening mechanism is studied in the atmospheric conditions of sdB stars. Electron impact Stark widths are compared to thermal Doppler widths as a function of temperature and optical depth of atmospheric layers.
Journal: Advances in Space Research - Volume 54, Issue 7, 1 October 2014, Pages 1223–1230