Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1995-03-07
Proc.Roy.Soc.Lond. 451 (1995) 341
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
13 pages, LATEX format, 25Kb, 2 postscript figures, Proc. Roy. Soc. London in press
Scientific paper
Quasinormal modes of ultra compact stars with uniform energy density have been calculated. For less compact stars, there is only one very slowly damped polar mode (corresponding to the Kelvin f-mode) for each spherical harmonic index $l$. Further long-lived modes become possible for a sufficiently compact star (roughly when $M/R \ge 1/3$). We compare the characteristic frequencies of these resonant polar modes to the axial modes first found by Chandrasekhar and Ferrari [{\em Proc. Roy. Soc. London A} {\bf 434} 449 (1991)]. We find that the two spectra approach each other as the star is made more compact. The oscillation frequencies of the corresponding polar and axial modes agree to within a percent for stars more compact than $M/R = 0.42$. At the same time, the damping times are slightly different. The results illustrate that there is no real difference between the origin of these axial and polar modes: They are essentially spacetime modes.
Andersson Nils.
Kojima Yasufumi
Kokkotas Kostas D.
No associations
LandOfFree
ON THE OSCILLATION SPECTRA OF ULTRA COMPACT STARS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ON THE OSCILLATION SPECTRA OF ULTRA COMPACT STARS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ON THE OSCILLATION SPECTRA OF ULTRA COMPACT STARS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-565902