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Neutral helium line profiles through the simulation of local interactions

Published online by Cambridge University Press:  09 October 2020

Patrick Tremblay Open the ORCID record for Patrick Tremblay [Opens in a new window] ,
Alain Beauchamp  and
Pierre Bergeron
Patrick Tremblay
Affiliation:
Département de Physique, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada email: patrick@astro.umontreal.ca
Alain Beauchamp
Affiliation:
Département de Physique, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada email: patrick@astro.umontreal.ca
Pierre Bergeron
Affiliation:
Département de Physique, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada email: patrick@astro.umontreal.ca
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Abstract

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For the past 25 years, we have been considering the Stark effect for neutral helium lines in DB white dwarfs using the standard Stark broadening theory in both the impact regime (in the center of the lines) and the quasi-static regime (in the wings) for the electrons, while neglecting the effect of ions in motion. Although this is probably a good approximation based on previous theoretical work, the transition between the two regimes for the electrons and the contribution of the ions very near the core might be poorly represented. To better represent these particularities, we report here the results of a new series of simulations that treat the local dynamics and interactions of both electrons and ions around a neutral helium atom. From these simulations, we produce new improved line profiles, which we compare with our previous analytical results.

Keywords

line: profilesatomic processesmethods: n-body simulationsmethods: statisticaltechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 89 - 92
Copyright
© International Astronomical Union 2020

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