Results 21 to 30 of about 42,381 (333)
Seismological insights into solar and stellar magnetic activity cycles
EPJ Web of Conferences, 2017 The Sun’s magnetic activity cycle varies primarily on a time scale of approximately 11yrs from minimum to maximum and back again. It is well-known that the properties of the Sun’s acoustic oscillations are affected by the near-surface internal magnetic ...
Broomhall Anne-Marie
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Cracking Strange Stars by Torsional Oscillations
Universe, 2018 Strange stars are one of the possible compact stellar objects formed in the core collapse of supernovae. These hypothetical stars are made by deconfined quark matter and are selfbound.
Francesco Tonelli, Massimo Mannarelli
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Dynamical Tides in Eccentric Binaries and Tidally-Excited Stellar Pulsations in KEPLER KOI-54 [PDF]
, 2011 Recent observation of the tidally-excited stellar oscillations in the main-sequence binary KOI-54 by the KEPLER satellite provides a unique opportunity for studying dynamical tides in eccentric binary systems.
Alexander +32 more
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Chaotic Dynamics of Stellar Spin in Binaries and the Production of Misaligned Hot Jupiters
EPJ Web of Conferences, 2015 Motivated by observed hot Jupiter systems with high stellar obliquities, we examine the dynamics of stellar spin in planetary systems with distant stellar companions, with inclinations sufficiently high so that the planet undergoes Kozai-Lidov ...
Anderson Kassandra R. +2 more
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Latitudinal Propagation of Thermal Rossby Waves in Stellar Convection Zones
The Astrophysical Journal, 2023 Using an analytic model, we derive the eigenfrequencies for thermal Rossby waves that are trapped radially and latitudinally in an isentropically stratified atmosphere. We ignore the star’s curvature and work in an equatorial f-plane geometry.
Rekha Jain, Bradley W. Hindman
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Stellar oscillations in modified gravity [PDF]
Physical Review D, 2013 Starting from the equations of modified gravity hydrodynamics, we derive the equ tions of motion governing linear, adiabatic, radial perturbations of stars in scalar-tensor theories. There are two new features: first, the eigenvalue equation for the period of stellar oscillations is modified such that the eigenfrequencies are always larger than ...
openaire +2 more sources
, 2011 The recently-discovered accreting X-ray pulsar IGR J17480--2446 spins at a frequency of ~11 Hz. We show that Type I X-ray bursts from this source display oscillations at the same frequency as the stellar spin. IGR J17480--2446 is the first secure case of
Altamirano +32 more
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Techniques for observing stellar oscillations [PDF]
Symposium - International Astronomical Union, 1988 Although stellar oscillations have been observed for more than two centuries, the demands of asteroseismology require new observations of substantially higher precision. Two major techniques are reviewed: Doppler spectroscopy and photometry. Fundamental limitations are described using the sun as a representative stellar target. The current state of the
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Asteroseismic modelling of the Binary HD 176465
EPJ Web of Conferences, 2017 The detection and analysis of oscillations in binary star systems is critical in understanding stellar structure and evolution. This is partly because such systems have the same initial chemical composition and age.
Nsamba B. +6 more
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