منابع مشابه
Pulsations in hot supergiants
Massive stars are the cosmic engines that shape and drive our Universe. Many issues such as their formation, their stability and the mass loss effects, are far from being completely understood. Recent ground-based and space observations have shown pulsations in massive MS and post-MS stars, such as acoustic and gravity modes excited by the κ-mechanism and even solar-like oscillations. Theoretic...
متن کاملStudies of Geomagnetic Pulsations Using Magnetometer Data from the CHAMP Low-Earth-Orbit Satellite and Ground-Based Stations: a Review
We review research on geomagnetic pulsations carried out using magnetic field measurements from the CHAMP lowEarth-orbit (LEO) satellite and ground-based stations in South Africa and Hungary. The high quality magnetic field measurements from CHAMP made it possible to extract and clearly resolve Pi2 and Pc3 pulsations in LEO satellite data. Our analyses for nighttime Pi2 pulsations are indicativ...
متن کاملNeutron Star Pulsations and Instabilities
Gravitational radiation (GR) drives an instability in certain modes of rotating stars. This instability is strong enough in the case of the r-modes to cause their amplitudes to grow on a timescale of tens of seconds in rapidly rotating neutron stars. GR emitted by these modes removes angular momentum from the star at a rate which would spin it down to a relatively small angular velocity within ...
متن کاملOrigin of cerebrospinal fluid pulsations.
ADOLPH, ROBERT J., HIROO FUKUSUMI, AND NOBLE 0. FOWLER. Origin of cerebrospinal jluid pulsations. Am. J. Physiol. 2 I 2 (4) : 840-846. I 967. -Experiments were performed in dogs to determine whether cerebrospinal fluid pulses were venous or arterial in origin. Since all cerebrospinal fluid pulsations synchronous with the heart beat must originate either in the right atrium or the left ventricle...
متن کاملSecond-Order Pulsations In Polytropes
A theory due to Eddington is employed to calculate second-order corrections to the usual linear, quasi-adiabatic pulsational amplitudes. Such corrections are necessary in order to evaluate the pulsational stability of stars in thermal imbalance (dSo/dt ;c 0). The second-order quantities are calculated, and their properties discussed, for a wide variety of polytropic models. Subsequently, a numb...
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ژورنال
عنوان ژورنال: Nature
سال: 1883
ISSN: 0028-0836,1476-4687
DOI: 10.1038/028367e0