White dwarf seismology

Details White dwarf seismology White dwarf seismology

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..253h&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 253-258.

Astronomy and Astrophysics

Astrophysics

22

Metallic Stars, Seismology, Stellar Models, Stellar Motions, Stellar Structure, White Dwarf Stars, Approximation, Cores, Iron, Metal Crystals, Oscillations, Shear Properties

Scientific paper

A cool, 1-solar mass, Fe-56 white dwarf model is analyzed to determine the effects of a shear-supporting crystalline core upon the nonradial oscillation periods in the Cowling approximation. Both spheroidal and toroidal modes with l = 1, 2, and 3 have been calculated. Of the spheroidal oscillations, only the g-modes are seriously shifted in frequency. The toroidal oscillations, which have nonzero frequencies because of the nonzero shear modulus of the solid core, have periods intermediate between those of the p- and g-modes. None of the low-order oscillation modes have frequencies comparable to those observed in the ZZ Ceti white dwarfs.

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