Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..179f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 179-189
Astronomy and Astrophysics
Astrophysics
8
Electron Transitions, H Alpha Line, H Beta Line, Spectral Line Width, Stellar Magnetic Fields, White Dwarf Stars, Zeeman Effect, Absorption Spectra, Astronomical Spectroscopy, Quantum Numbers, Stellar Spectra
Scientific paper
In strong magnetic fields the degeneracy among atomic energy levels of the same principle quantum number in hydrogen is removed by Zeeman splitting. We investigated the line broadening of such isolated transitions by means of stationary Balmer transitions. At the stationary points an absorption edge occurs in the flux spectrum. Two such absorption edges were observed with high spectral resolution in the spectrum of the magnetic white dwarf Grw + 70 deg 8247. The local line profiles are estimated by means of the flux gradient in the edge and the actual position of the edge. The line absorption starts 5-6 A beyond the corresponding turn around points and altogether the local line widths are approximately 20 A. Since in non-magnetic white dwarfs above 10000 K, Stark effect is the dominating line broadening mechanism, we performed quantum mechanical calculations referring to hydrogen including both, (strong) magnetic fields and electric fields. According to the corresponding electron density, the randomly fluctuating electric field, which is caused by neighboring free electron and ions, is typical 107 V/m in non-magnetic white dwarfs. Within some restrictions both, the commencement of line absorption 5-6 A beyond the stationary wavelength and the overall width of approximately 20 A of the local line profile, cannot be explained by such randomly fluctuating electric fields, as far as the physical conditions of non-magnetic white dwarfs are applied. This, and the influence of other line broadening mechanisms, is discussed in some detail.
Friedrich Stefan
Östreicher Roland
Ruder Hanns
Zeller G.
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