Results 251 to 260 of about 42,007 (286)

Theoretical Underpinnings: Stellar Oscillations

2017
This chapter shows how the oscillations of a star are related to its structure. It also describes some of the important properties of stellar oscillations that allow us to use seismic data to determine stellar properties. Stellar oscillations are the response of a star to a mechanical disturbance, and thus the equations of stellar oscillations are ...
Sarbani Basu, William J. Chaplin
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High Frequency Stellar Oscillations

1971
Time-series data for 14 stars in the list of Eggen and Greenstein have been used to compute their power spectra, which confirm previously found quiescency in the 4 to 700 sec period range. Additionally, characteristics of the continuous power spectra are considered.
J. E. Hesser, B. M. Lasker
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Multiperiodic Stellar Oscillations

1990
The present observational and theoretical status of the multiperiodic stars is reviewed. Focusing mostly on the doubly-periodic pulsation we emphasize the important role of this type of pulsation in the estimation of the basic stellar parameters. Classes of possible doubly-periodic stellar pulsations are discussed in the framework of the amplitude ...
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Non-radial Stellar Oscillations

2012
We use spherical coordinates r, ϑ, ϕ and describe the velocity of a mass element by a vector v having the components v r , v ϑ , v ϕ . For the radial pulsations treated in the foregoing sections, the velocity has only one non-vanishing component, v r , which depends only on r.
Rudolf Kippenhahn, Alfred Weigert, Achim Weiss   +2 more
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Oscillations in Young Stellar Objects

International Astronomical Union Colloquium, 2002
AbstractWe report the discovery of periodicities in the light curve of the Herbig Ae star V346 Ori. We interpret these variations as the superposition of at least two signals with periods P1=42±6 min and P2=68±12 min resulting from stellar oscillations.
F.J.G. Pinheiro, D.F.M. Folha, M.J.P.F.G. Monteiro, M. Marconi, V. Ripepi, F. Palla   +5 more
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Hydrodynamic stability and stellar oscillations

Pramana, 2011
Chandrasekhar’s monograph on Hydrodynamic and hydromagnetic stability, published in 1961, is a standard reference on linear stability theory. It gives a detailed account of stability of fluid flow in a variety of circumstances, including convection, stability of Couette flow, Rayleigh–Taylor instability, Kelvin–Helmholtz instability as well as the Jean’
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Stellar oscillations as magnetic probes

Science, 2015
Asteroseismology![Figure][1] Artistic representation of a magnetized red giant starPHOTO: RAFAEL A. GARCIA/SAP CEA, JIM FULLER/CALTECH, GABRIEL PEREZ/SMM/IAC, KYLE AUGUSTSON/HA, SOLAR IMAGE FROM AIA/SDO Unlike magnetic fields on the surfaces of stars, those within a star have so ...
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Solar and Stellar Oscillations

1981
We try to explain in simple words what a stellar oscillation is, what kind of restoring forces and excitation mechanisms can be responsible for its occurence, what kind of questions the theoretician asks to the observer and what kind of tools the latter is using to look for the answers, A selected review of the most striking results obtained in the ...
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Theory of stellar oscillations

This lecture covers the theoretical basics of stellar oscillations. The first part focuses on solar-like oscillations, which are the core targets of the PLATO mission: after a thorough introduction about the properties of the seismic spectrum of solar-like stars and how they relate to their internal structure and fundamental stellar parameters, we ...
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Observations of Stellar Oscillations

Course #3 "Observations of stellar oscillations" at Porto Summer School on Asteroseismology: from Pixels to Stellar Ages.
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