Issue |
A&A
Volume 435, Number 3, June I 2005
|
|
---|---|---|
Page(s) | 1191 - 1198 | |
Section | Atomic, molecular, and nuclear data | |
DOI | https://doi.org/10.1051/0004-6361:20042318 | |
Published online | 13 May 2005 |
On the influence of Stark broadening on Cr I lines in stellar atmospheres
1
Astronomical Observatory, Volgina 7, 11160 Belgrade 74, Serbia
2
Isaac Newton Institute of Chile, Yugoslavia Branch, Yugoslavia e-mail: mdimitrijevic@aob.bg.ac.yu
3
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia
4
Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
5
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
6
Tavrian National University, Yaltinskaya 4, 330000 Simferopol, Crimea, Ukraine
Received:
5
November
2004
Accepted:
17
January
2005
Using the semiclassical perturbation method, electron-,
proton-, and ionized helium-impact line widths and shifts for the
nine Cr i spectral lines from the multiplet were
calculated for a perturber density of 1014 cm-3 and for
temperatures
K. The results were used to
investigate the influence of Stark broadening effect in the
Cr-rich Ap star β CrB atmosphere on line shapes of these
lines. It was found that the contribution of proton and He ii collisions to the line width and shift is significant and
comparable, and is sometimes even larger than electron-impact
contribution depending of the electron temperature. Moreover, not
only the Stark line width, but also the Stark shift may contribute
to the blue as well as to the red asymmetry of the same line
depending on the electron-, proton-, and He ii density in stellar
atmosphere. The results were used to investigate the influence of
Stark broadening effect on Cr i line shapes in the atmosphere of
the Cr-rich Ap star
CrB.
Key words: atomic processes / line: profiles / stars: chemically peculiar / stars: individual: β CrB
© ESO, 2005
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