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Atoms 2017, 5(4), 44;

A New Analysis of Stark and Zeeman Effects on Hydrogen Lines in Magnetized DA White Dwarfs

Laboratoire PIIM, Aix-Marseille Université and CNRS, 13397 Marseille CEDEX 20, France
Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia
Author to whom correspondence should be addressed.
Received: 8 September 2017 / Revised: 13 October 2017 / Accepted: 1 November 2017 / Published: 6 November 2017
(This article belongs to the Special Issue Spectral Line Shapes in Astrophysics and Related Topics)
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White dwarfs with magnetic field strengths larger than 10 T are understood to represent more than 10% of the total population of white dwarfs. The presence of such strong magnetic fields is clearly indicated by the Zeeman triplet structure visible on absorption lines. In this work, we discuss the line broadening mechanisms and focus on the sensitivity of hydrogen lines on the magnetic field. We perform new calculations in conditions relevant to magnetized DA stellar atmospheres using models inspired from magnetic fusion plasma spectroscopy. A white dwarf spectrum from the Sloan Digital Sky Survey (SDSS) database is analyzed. An effective temperature is provided by an adjustment of the background radiation with a Planck function, and the magnetic field is inferred from absorption lines presenting a Zeeman triplet structure. An order-of-magnitude estimate for the electron density is also performed from Stark broadening analysis. View Full-Text
Keywords: line shapes; Stark broadening; Zeeman effect; white dwarfs line shapes; Stark broadening; Zeeman effect; white dwarfs

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Kieu, N.; Rosato, J.; Stamm, R.; Kovačević-Dojcinović, J.; Dimitrijević, M.S.; Popović, L.Č.; Simić, Z. A New Analysis of Stark and Zeeman Effects on Hydrogen Lines in Magnetized DA White Dwarfs. Atoms 2017, 5, 44.

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