Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-30
Astronomy and Astrophysics
Astrophysics
8 pages, Astron. Astrophys. accepted
Scientific paper
10.1051/0004-6361:20042318
Using the semiclassical perturbation method, electron-, proton-, and ionized helium-impact line widths and shifts for the nine Cr I spectral lines from the $4p^7P^0-4d^7D$ multiplet, have been calculated for a perturbers density of 10$^{14}$ cm$^{-3}$ and temperatures T =2,500 - 50,000 K. The obtained results have been used to investigate the influence of Stark broadening effect in the Cr-rich Ap star $\beta $ CrB atmosphere on line shapes of these lines. It has been found that the contribution of the proton and He II collisions to the line width and shift is significant, and it is comparable and sometimes (depending of the electron temperature) even larger than electron-impact contribution. Moreover, not only the Stark line width, but, depending on the electron-, proton-, and He\ii density in stellar atmosphere also the Stark shift may contribute to the blue as well as to the red asymmetry of the same line. The obtained results have been used to investigate the influence of Stark broadening effect on line shapes of Cr\i lines in the atmosphere of Cr-rich Ap star $\beta $ CrB.
Dimitrijevic Milan S.
Khan Sergiy
Popovic Luka C.
Ryabchikova Tanya
Shulyak Denis
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