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Quasistatic waves of hydrogravity generated in the galactic interstellar medium by a pulsating neutron star

Title
Quasistatic waves of hydrogravity generated in the galactic interstellar medium by a pulsating neutron star
Authors
Bastrukov S.Molodtsova I.Podgainy D.Papoyan V.Yang J.Murray D.
Ewha Authors
양종만
SCOPUS Author ID
양종만scopus
Issue Date
2004
Journal Title
Journal of Experimental and Theoretical Physics
ISSN
1063-7761JCR Link
Citation
Journal of Experimental and Theoretical Physics vol. 99, no. 3, pp. 449 - 459
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Based on principles of classical hydrodynamics and Newtonian gravity, the theory of hydrogravity, formulated in the manner of hydromagnetic theory, is developed to account for the gravitational effect of global pulsations of a star on the motions of the ambient gas-dust interstellar medium. Analytic derivation of the dispersion relation for canonical gravity waves at the free surface of an incompressible in viscid liquid is presented, illustrating practical usefulness of the proposed approach, heavily relying on the concept of classical gravitational stress introduced long ago by Fock and Chandrasekhar, and accentuating the shear character of this mode. Particular attention is given to gas-dynamical oscillations of a similar physical nature generated by a pulsating neutron star in an unbounded spherical shell of gas and dust promoted by circumstellar gravitational stresses and damped by viscosity of the interstellar matter. Computed in the long-wavelength approximation, the periods of these gravity-driven shear modes, referred to as quasistatic modes of hydrogravity, are found to be proportional to periods of the gravity modes in the neutron star bulk. Given that collective oscillations of cosmic plasma in the wave under consideration should be accompanied by electromagnetic radiation and taking into account that only the radio waves of this radiation can freely travel through the galactic gas-dust clouds, it is conjectured that the considered effect of gravitational coupling between seismic vibrations of a neutron star and fluctuations of the galactic interstellar medium should manifest itself in the radio range of pulsar spectra. Some useful implications of the theory developed here to a number of current problems of asteroseismology are briefly discussed. © 2004 MAIK "Nauka/Interperiodica".
DOI
10.1134/1.1809671
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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