Results 21 to 30 of about 15,412 (318)

Effluent stellar pulsation

The Astrophysical Journal, 1990
Near-discontinuities in the density of a star, such as that encountered in the transition between a chromosphere and a corona, reflect acoustic waves and thereby partially contain them within the star. These reflections help to establish a resonant acoustic cavity with discrete characteristic frequencies, even for modes with frequencies above the ...
N. J. Balmforth, D. O. Gough
openaire   +1 more source

Challenges in 2D Stellar Modeling

Frontiers in Astronomy and Space Sciences, 2020
Traditionally, stellar structure and evolution have been modeled with a series of concentric spherical shells. This description allows the star to be modeled in 1 dimension, greatly simplifying the calculations.
Catherine C. Lovekin
doaj   +1 more source

Non-linear modelling of beat Cepheids: Resonant and non-resonant models [PDF]

, 2010
The phenomenon of double-periodic Cepheid pulsation is still poorly understood. Recently we rediscussed the problem of modelling the double-periodic pulsation with non-linear hydrocodes.
Moskalik, P., Smolec, R.
core   +1 more source

Seismological Studies of Pulsating DA White Dwarfs Observed with the Kepler Space Telescope and K2 Campaigns 1–8

The Astrophysical Journal, 2023
AllS single stars that are born with masses up to 8.5–10 M _⊙ will end their lives as white dwarf (WD) stars. In this evolutionary stage, WDs enter the cooling sequence, where the stars radiate away their thermal energy and are basically cooling.
Weston Hall, Barbara G. Castanheira, Agnès Bischoff-Kim   +2 more
doaj   +1 more source

On a mechanism for enhancing magnetic activity in tidally interacting binaries [PDF]

, 2002
We suggest a mechanism for enhancing magnetic activity in tidally interacting binaries. We suppose that the deviation of the primary star from spherical symmetry due to the tidal influence of the companion leads to stellar pulsation in its fundamental ...
Belvedere G., Biront D., Cowling T. G., Cowling T. G., de Medeiros J. R., Donati J. F., G. Belvedere, G. Javakhishvili, Glebocki R., Habets G. M. H. J., Hut P., Markey P., Piddington J. H., Roberts P. H., Rutten R. G. M., Savonije G. J., Schrijver C. J., Smeyers P., Spruit H. C., T. Zaqarashvili, Tayler R. J., Tayler R. J., Walen C., Wright G. A. E., Zahn J. P., Zahn J. P.   +25 more
core   +2 more sources

Why should we correct reported pulsation frequencies for stellar line-of-sight Doppler velocity shifts?

, 2014
In the age of Kepler and Corot, extended observations have provided estimates of stellar pulsation frequencies that have achieved new levels of precision, regularly exceeding fractional levels of a few parts in $10^{4}$.
Campante, T. L., Chaplin, W. J., Davies, G. R., Elsworth, Y., Handberg, R., Miglio, A.   +5 more
core   +1 more source

Improving the mass determination of Galactic Cepheids [PDF]

, 2001
We have selected a sample of Galactic Cepheids for which accurate estimates of radii, distances, and photometric parameters are available. The comparison between their pulsation masses, based on new Period-Mass-Radius (PMR) relations, and their ...
Bessell M. S., Bono G., Christy R. F., Deasy H. P., F. Caputo, Feast M. W., Fouque P., Fry A. M., G. Bono, Gieren W. P., Girardi L., Li Y., M. Marconi, P. Fouque, Seaton M. J., W. P. Gieren   +15 more
core   +4 more sources

Stochastic Processes in Yellow and Red Pulsating Variables

, 2009
Random changes in pulsation period are well established in cool pulsating stars, in particular the red giant variables: Miras, semi-regulars of types A and B, and RV Tau variables.
D. G. Turner, J. R. Percy, Joyce Ann Guzik, L. N. Berdnikov, M. Abdel-Sabour Abdel-Latif, Paul A. Bradley, T. Colivas   +6 more
core   +1 more source

Dust Shells around OH/IR Stars [PDF]

Journal of Astronomy and Space Sciences, 1988
We have made new models for mass-losing OH/IR stars to explain the properties of the dust shells around them using more accurate information about the material in the shell and the physical processes including pulsations. We have applied our dust opacity
Kyung-Won Suh
doaj  

Thermal Evolution of a Pulsating Neutron Star

, 2005
We have derived a set of equations to describe the thermal evolution of a neutron star which undergoes small-amplitude radial pulsations. We have taken into account, in the frame of the General Theory of Relativity, the pulsation damping due to the bulk ...
Gnedin, O. Y., Gusakov, M. E., Yakovlev, D. G.   +2 more
core   +3 more sources