Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.358l...6k&link_type=abstract
Monthly Notices of the Royal Astronomical Society: Letters, Volume 358, Issue 1, pp. L6-L10.
Astronomy and Astrophysics
Astronomy
30
Stars: Individual: 33 Lib (Hd 137949), Stars: Magnetic, Stars: Oscillations, Stars: Variables
Scientific paper
We show unprecedented resolution of the amplitudes and phases of the principal 2.015-mHz mode and its 4.030-mHz harmonic as a function of atmospheric depth in the roAp star 33 Lib using high-resolution Very Large Telescope (VLT) Ultraviolet-Visual Echelle Spectrograph (UVES) spectra. We show that the pulsation amplitude increases upwards into the Nd III line-forming layer away from an atmospheric node, and increases downwards from the same node in the Nd II line-forming layer. We suggest that the Nd III layer, which arises at, or above, τ~ 10-3, overlaps with the magnetoacoustic boundary layer, and that our detailed observations of pulsation amplitude and phase variations with depth provide a first probe of this layer.
Elkin V. G.
Kurtz Don W.
Mathys Gautier
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