Effects of line asymmetries on the determination of solar internal structure

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dc.creatorRabello-Soares, M. C.
dc.creatorChristensen-Dalsgaard, J.
dc.creatorRosenthal, C. S.
dc.creatorThompson, M. J.
dc.date1999-08-23
dc.date.accessioned2026-07-07T02:32:54Z
dc.date.available2026-07-07T02:32:54Z
dc.descriptionDespite the strong evidence that the peaks in the spectrum of solar oscillations are asymmetric, most determinations of mode frequencies have been based on fits of symmetric Lorentzian profiles to the Fourier or power spectra of oscillation time strings. The systematic errors resulting from neglecting the line asymmetry could have serious effects on inversions for the solar internal structure and rotation. Here we analyse artificial data based on simple models of the intrinsic line asymmetry, using GONG mode parameters with asymmetries found by one of us (Rosenthal \cite{rosenthal2}). By fitting Lorentzians to the resulting spectra, we estimate the likely properties of the errors introduced in the frequencies. We discuss whether these frequency shifts have a form similar to the near-surface layers uncertainties and are therefore suppressed in the solar structure inversion. We also estimate directly their contribution, if any, in the solar sound-speed and density determinations using the SOLA technique.
dc.description9 pages, 10 figures. Accepted for publication on A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9908250
dc.identifierhttp://arxiv.org/abs/astro-ph/9908250
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14630
dc.subjectAstrophysics
dc.titleEffects of line asymmetries on the determination of solar internal structure
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