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Pulsations of Hydrogen Deficient Stars

Published online by Cambridge University Press:  12 April 2016

Hideyuki Saio
Hideyuki Saio*
Affiliation:
Department of AstronomyUniversity of TokyoTokyo 113Japan

Abstract

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A review is given on the properties of the pulsating hydrogen-deficient stars. Since they lie in a large area of the HR diagram, the properties of pulsations are greatly different among them. Pulsations tend to change from radial pulsations to non-radial pulsations as the surface gravity increases. Strong nonadiabaticity affects the dynamical properties of pulsations in high luminosity helium stars. The kappa and gamma mechanisms for helium ionization excite radial pulsations in relatively cool helium stars and nonradial pulsations in DB (helium atmosphere) white dwarfs, while the cyclical ionization of the K-shell electrons of carbon and oxygen seems to be responsible for the excitation of the nonradial pulsations in the GW Vir (PG1159-035) stars (very hot hydrogen-deficient pre-white dwarf stars). The excitation mechanism of the radial pulsations in a unique extreme helium star V652 Her (BD+13°3224) is not known. Period changes have been detected for many pulsating helium stars except the pulsating DB white dwarfs.

Type
IX Theory
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 424 - 440
Copyright
Copyright © Reidel 1986

References

Alexander, J.B., Andrews, P.J., Catchpole, R.M., Feast, M.W., Lloyd Evans, T. Menzies, J.W., Wisse, P.N.J., and Wisse, M. 1972, Mon. Not. R. astr. Soc. 158, 305.Google Scholar
Bond, H.E., Grauer, A.D., Green, R.F., and Liebert, J.W. 1984, Astrophys, J. 279, 751.Google Scholar
Cottrell, P.L. and Lambert, D.L. 1982, Astrophys. J. 261, 595.Google Scholar
Cox, J.P. 1974, Rep. Prog. Phys. 37, 563.Google Scholar
Cox, J.P. 1980, ‘Theory of Stellar Pulsation’ (Princeton: Princeton University Press).Google Scholar
Cox, J.P. 1985, in IAU Colloq. #82, ‘Cepheids: Observation and Theory’, ed. Madore, B.F. (Cambridge: Cambridge University Press), p. 126.Google Scholar
Cox, J.P., King, D.S., Cox, A.N., Wheeler, J.C., Hansen, C.J., and Hodson, S.W. 1980, Space Sci. Rev. 27, 529.Google Scholar
Drilling, J.S., Schönberner, D., Heber, U., and Lynas-Gray, A.E. 1984, Astrophys. J., 278, 224.Google Scholar
Fadeyev, Yu.A. and Fokin, A.B. 1985, Astrophys. Space Sci. 111, 355.CrossRefGoogle Scholar
Feast, M.W. 1975, in IAU Symp. #67, ‘Variable Stars and Stellar Evolution’, eds. Sherwood, V.E. and Plaut, L. (Dordrecht: Reidel), p.293.Google Scholar
Fernie, J.D. 1982, Pub. Astr. Soc. Pacific 94, 172.Google Scholar
Fernie, J.D., Sherwood, V., and DuPuy, D.L. 1972, Astrophys. J. 172, 383.Google Scholar
Grauer, A.D. and Bond, H.E. 1984, Astropys. J. 277, 211.Google Scholar
Grauer, A.D., Drilling, J.S., and Schönberner, D. 1984, Astr. Astrophys. 133, 285.Google Scholar
Heber, U. and Schönberner, D. 1981, Astr. Astrophys. 102, 73.Google Scholar
Hill, P.W., Kilkenny, D., Schönberner, D., and Walker, H.J. 1981, Mon. Not. R. astr. Soc. 197, 81.Google Scholar
Hill, P.W., Lynas-Gray, A.E., and Kilkenny, D. 1984, Mon. Not. R. astr. Soc. 207, 823.Google Scholar
Hunger, K. and Kaufmann, J.P. 1973, Astr. Astrophys. 25, 261.Google Scholar
Iben, I. Jr. 1984, Astrophys. J. 277, 333.CrossRefGoogle Scholar
Jeffery, C.S. 1984, Mon. Not. R. astr. Soc. 210, 731.Google Scholar
Jeffery, C.S. and Hill, P.W. 1986, ‘The radial velocity curve of V652 Her (BD+13°3224)’, preprint.Google Scholar
Jeffery, C.S., Hill, P.W., and Morrison, K. 1986, ‘The period of the extreme helium star BD+1°4381’, preprint.Google Scholar
Jeffery, C.S. and Malaney, R.A. 1985, Mon. Not. R. astr. Soc. 213, 61p.Google Scholar
Jeffery, C.S., Skillen, I., Hill, P.W., Kilkenny, D., Malaney, R.A., and Morrison, K. 1985, Mon. Not. R. astr. Soc. 217, 701.Google Scholar
Kaler, J.B. 1983, Astrophys. J. 271, 188.Google Scholar
Kaufmann, J.P. and Schönberner, D. 1977, Astr. Astrophys. 57, 169.Google Scholar
Kawaler, S.D., Hansen, C.J., and Winget, D.E. 1985, Astrophys. J. 295, 547.Google Scholar
Kawaler, S.D., Winget, D.E., Hansen, C.J. 1985, Astrophys. J. 298, 752.Google Scholar
Kawaler, S.D., Winget, D.E., Hansen, C.J., and Iben, I. Jr. 1986, ‘The Helium Shell Game: Nonradial G-mode Instabilities In Hydrogen Deficient Planetary Nebula Nuclei’, preprint.Google Scholar
Kilkenny, D. 1982, Mon. Not. R. astr. Soc. 200, 1019.CrossRefGoogle Scholar
Kilkenny, D. 1983, Mon. Not. R. astr. Soc. 205, 907.Google Scholar
Kilkenny, D. and Flanagan, C. 1983, Mon. Not. R. astr. Soc. 203, 19.CrossRefGoogle Scholar
Kilkenny, D. and Lynas-Gray, A.E. 1982, Mon. Not. R. astr. Soc. 198, 873.Google Scholar
Kilkenny, D. and Lynas-Gray, A.E. 1984, Mon. Not. R. astr. Soc. 208, 673.Google Scholar
King, D.S. 1980, Space Sci. Rev. 27, 519.Google Scholar
King, D.S., Wheeler, J.C., Cox, J.P., Cox, A.N., and Hodson, S.W. 1980, in ‘Nonradial and Nonlinear Stellar Pulsation’, eds. Hill, H.A. and Dziembowski, W.A. (Berlin: Springer-Verlag), p. 161.Google Scholar
Koester, D., Vauclair, G., Dolez, N., Oke, J.B., Greenstein, J.L., and Weidemann, V. 1985, Astr. Astrophys. 149, 423.Google Scholar
Landolt, A.U. 1975, Astrophys. J. 196, 789.Google Scholar
Lawson, W.A. 1985, MS thesis, University of Canterbury.Google Scholar
Lynas-Gray, A.E., Kilkenny, D., Skillen, I., and Jeffery, C.S. 1986, in IAU Colloq. #87, ‘Hydrogen Deficient Stars and Related Objects’, eds. Hunger, K., Rao, N.K., and Schonberner, D..Google Scholar
Lynas-Gray, A.E., Schönberner, D., Hill, P.W., and Heber, U. 1984, Mon. Not. R. astr. Soc., 209, 387.Google Scholar
Marraco, H.G. and Milesi, G.E. 1982, Astr. J. 87, 1775.Google Scholar
McGraw, J.T., Starrfield, S.G., Liebert, J., and Green, R.F. 1979, in IAU Colloq. #53, ‘White Dwarfs and Variable Degenerate Stars’, eds. Van Horn, H.M. and Weidemann, V. (Rochester: University of Rochester), p. 377.Google Scholar
Osaki, Y. 1982, in ‘Pulsations in Classical and Cataclysmic Variable Stars’ eds. Cox, J.P. and Hansen, C.J. (Boulder: JILA), p.303.Google Scholar
Rao, N.K., Ashok, N.M., and Kulkarni, P.V. 1980, J. Astrphys. Astr. 1, 71.Google Scholar
Saio, H. and Wheeler, J.C. 1982, in ‘Pulsations in Classical and Cataclysmic Variable Stars’, eds. Cox, J.P. and Hansen, C.J., (Boulder: JILA), p. 327.Google Scholar
Saio, H. and Wheeler, J.C. 1983, Astrophys. J. 272, L25.Google Scholar
Saio, H. and Wheeler, J.C. 1985, Astrophys. J. 295, 38.Google Scholar
Saio, H., Wheeler, J.C., and Cox, J.P. 1984, Astrophys. J. 281, 318.Google Scholar
Schönberner, D. 1975, Astr. Astrophys. 44, 383.Google Scholar
Schönberner, D. 1977, Astr. Astrophys. 57, 437.Google Scholar
Schönberner, D. 1978, Mitt. Astr. Ges. 43, 266.Google Scholar
Schönberner, D. 1979, Astr. Astrophys. 79, 108.Google Scholar
Shibahashi, H. and Osaki, Y. 1981, Publ. Astr. Soc. Japan 33, 427.Google Scholar
Starrfield, S.G., Cox, A.N., Kidman, R.B., and Pesnell, W.D. 1984, Astrophys. J. 281, 800.Google Scholar
Starrfield, S.G., Cox, A.N., Kidman, R.B., and Pesnell, W.D. 1985, Astrophys. J. 293, L23.Google Scholar
Stellingwerf, R.F. 1978, Astr. J. 83, 1184.Google Scholar
Trimble, V. 1972, Mon. Not. R. astr. Soc. 156, 411.Google Scholar
Unno, W., Osaki, Y., Ando, H., and Shibahashi, H. 1979, ‘Nonradial Oscillations of Stars‘ (Tokyo: University of Tokyo Press).Google Scholar
Van Horn, H.M. 1984, in 25th Liege Astrophysical Colloq. ‘Theoretical Problems in Stellar Stability and Oscillations’ (Liege: University of Liege), p.307.Google Scholar
Walker, H.J. and Kilkenny, D. 1980, Mon. Not. R. astr. Soc. 190, 299.Google Scholar
Wesemael, F., Green, R.F., and Liebert, J. 1985, Astrophys. J. Supple. 58, 379.Google Scholar
Winget, D.E. and Fontaine, G. 1982, in ‘Pulsations in Classical and Cataclysmic Variable Stars’, eds. Cox, J.P. and Hansen, C.J. (Boulder: JILA), p.46.Google Scholar
Winget, D.E., Hansen, C.J., Van Horn, H.M. 1983, Nature 303, 781.Google Scholar
Winget, D.E., Kepler, S.O., Robinson, E.L., Nather, R.E., and O’Donoghue, D. 1985, Astrophys. J. 292, 606.Google Scholar
Winget, D.E., Robinson, E.L., Nather, R.E., and Fontaine, G. 1982b, Astrophys. J. 262, Lll.Google Scholar
Winget, D.E., Robinson, E.L., Nather, R.E., and Balachandran, S. 1984, Astrophys. J. 279, L15.Google Scholar
Winget, D.E., Van Horn, H.M., Tassoul, M., Hansen, C.J., and Fontaine, G. 1983, Astrophys. J. 268, L33.Google Scholar
Winget, D.E., Van Horn, H.M., Tassoul, M., Hansen, C.J., Fontaine, G., and Carroll, B.W. 1982a, Astrophys. J. 252, L65.Google Scholar
Wood, P.R. 1976, Mon. Not. R. astr. Soc. 174, 531.Google Scholar
Zalewski, J. 1985, Acta Astr. 35, 51.Google Scholar