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Star-shaped oscillations of Leidenfrost drops [PDF]
Physical Review Fluids, 2017 We experimentally investigate the self-sustained, star-shaped oscillations of Leidenfrost drops. The drops levitate on a cushion of evaporated vapor over a heated, curved surface. We observe modes with $n = 2-13$ lobes around the drop periphery. We find that the wavelength of the oscillations depends only on the capillary length of the liquid, and is ...
Juan-Jose Lietor-Santos +2 more
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Spectroscopy of Rapidly Oscillating Ap Stars [PDF]
International Astronomical Union Colloquium, 2002 AbstractWe identify Spectroscopic differences between roAp stars and Ap stars with no observational evidence for pulsation, but with otherwise similar Teff and log g values. These differences concern the abundance pattern, Hydrogen line profile anomalies, evidence for stratification, and effects of pulsation on spectral lines.
Weiss, Werner W. +8 more
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Oscillations of rapidly rotating superfluid stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 Using time evolutions of the relevant linearised equations we study non-axisymmetric oscillations of rapidly rotating and superfluid neutron stars. We consider perturbations of Newtonian axisymmetric background configurations and account for the presence of superfluid components via the standard two-fluid model. Within the Cowling approximation, we are
Passamonti, A. +2 more
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Scaling of oscillation frequencies in rotating stars [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractWe have studied oscillation frequencies of two-dimensional uniformly rotating zero-age main sequence stellar models in the delta Scuti mass range. We identified 370 p and g axisymmetric modes for non-rotating models and then traced their evolution as the rotational velocity was increased.
Diego Castañeda, Robert G. Deupree
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Nonlinear radial oscillations of neutron stars [PDF]
Physical Review D, 2009 The effects of nonlinear oscillations in compact stars are attracting considerable current interest. In order to study such phenomena in the framework of fully nonlinear general relativity, highly accurate numerical studies are required. We present a numerical scheme specifically tailored for studies, based on formulating the time evolution in terms of
Ulrich Sperhake +3 more
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One-armed oscillations in Be star discs [PDF]
Astronomy & Astrophysics, 2006 10 pages with 6 figures; accepted by A& ...
Papaloizou, J.C.B., Savonije, G.J.
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Oscillations of rotating neutron stars [PDF]
The Astrophysical Journal, 1991 AbstractWe use a perturbation technique to compute the rotational corrections to the non-radial oscillation spectrum of a realistic neutron-star model. We compute, to first order in the rotation rate, the corrections to the normal mode eigenfrequencies and eigenfunctions.
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Variations of the amplitudes of oscillation of the Be star Achernar [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We report on finding variations in amplitude of the two main oscillation frequencies found in the Be star Achernar, over a period of 5 years. They were uncovered by analysing photometric data of the star from the SMEI instrument. The two frequencies observed, 0.775 c/d and 0.725 c/d, were analysed in detail and their amplitudes were found to increase ...
K. J. F. Goss +5 more
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Non-Radial Oscillations in δ Scuti Stars and Rapidly Oscillating AP Stars [PDF]
Highlights of Astronomy, 1986 AbstractThe present state of our knowledge of non-radial oscillations in δ Scuti stars and Rapidly Oscillating Ap stars is discussed primarily from an observational point of view. For the δ Scuti stars the need for complete frequency solutions for multi-periodic non-radial oscillating stars is emphasized in order for stellar seismology of these stars ...
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