13 citations · 23 across the 6 of their papers we have counts for
6 papers
Line shapes of the Na/K resonance line profiles perturbed by H2 at extreme density
N. F. Allard, J. F. Kielkopf
Collision broadening by molecular hydrogen of sodium and potassium is one of the major broadening mechanisms in the atmospheres of brown dwarf stars and exoplanets at an effective…
New theoretical study of potassium perturbed by He and a comparison to laboratory spectra
N. F. Allard, J. F. Kielkopf, K. Myneni +1
We report on our new calculations of unified line profiles of K perturbed by He using ab initio potential data for the conditions prevailing in cool substellar brown dwarfs and hot…
Temperature and density dependence of line profiles of sodium perturbed by helium
N. F. Allard, K. Myneni, J. N. Blakely +1
Ultracool stellar atmospheres show absorption by alkali resonance lines severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, such as th…
Collision-induced satellite in the blue wing of the Balmer-beta line and consequences on the Balmer series
F. Spiegelman, N. F. Allard, J. F. Kielkopf
In this paper we emphasize the non-Lorentzian behavior of the Balmer series in helium-dominated DBA white dwarf stars for which the decades-old problem exists for the determination…
Collisional effects in the blue wing of the Balmer-alpha line
N. F. Allard, F. Spiegelman, J. F. Kielkopf +1
In order to investigate the near wing of the Lyman-alpha line, accurate line profile calculations and molecular data are both required due to the existence of a close line satellit…
Collisional effects in the blue wing of Lyman-alpha
F. Spiegelman, N. F. Allard, J. F. Kielkopf
Spectral observations below Lyman-alpha are now obtained with the Cosmic Origin Spectrograph (COS) on the Hubble Space Telescope (HST). It is therefore necessary to provide an accu…