We explore the possibility that the steepening observed shortward of 1000 Å in the energy distribution of quasars may result from absorption by dust, being...
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PublicationNanodiamond Dust and the Far-Ultraviolet Quasar Break
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PublicationNear optimal angular quadratures for polarised radiative transfer
In three-dimensional (3D) radiative transfer (RT) problems, the tensor product quadratures are generally not optimal in terms of the number of discrete ray...
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PublicationNew ATLAS9 and MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
We present a new grid of model photospheres for the SDSS-III/APOGEE survey of stellar populations of the Galaxy, calculated using the ATLAS9 and MARCS codes...
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PublicationNew H-band Stellar Spectral Libraries for the SDSS-III/APOGEE Survey
The Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) has obtained high-resolution (R ∼ 22,500), high...
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PublicationNon-coherent Continuum Scattering as a Line Polarization Mechanism
Line scattering polarization can be strongly affected by Rayleigh scattering at neutral hydrogen and Thomson scattering at free electrons. Often a...
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PublicationNon-local thermodynamic equilibrium inversions from a 3D magnetohydrodynamic chromospheric model
Context. The structure of the solar chromosphere is believed to be governed by magnetic fields, even in quiet-Sun regions that have a relatively weak...
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PublicationNon-LTE abundance corrections for late-type stars from 2000 Å to 3 µm. I. Na, Mg, and Al
Context. It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Making an accurate abundance determination requires...
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PublicationNon-LTE Determination of the Silicon Abundance Using a Three-dimensional Hydrodynamical Model of the Solar Photosphere
Confrontations of spectroscopic observations with local thermodynamic equilibrium (LTE) spectral syntheses in a three-dimensional (3D) hydrodynamical model of...
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PublicationNon-LTE Inversion of Line Profiles
In this paper we address the problem of the non-LTE (NLTE) inversion of line profiles by means of a nonlinear least-squares minimization procedure combined with...