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The Origin and Evolution of Helium-Rich White Dwarfs

Published online by Cambridge University Press:  12 April 2016

James Liebert
James Liebert*
Affiliation:
Steward ObservatoryUniversity of ArizonaTucson, Arizona 85721USA

Abstract

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White dwarfs with helium-rich atmospheres constitute about one fifth of the white dwarfs hotter than 12,000 K. They appear to have a mass distribution similar to the hydrogen atmosphere (DA) stars, and are similar in other properties. However, the temperature distribution exhibits a deficiency of DB/DO stars in the interval 25,000-45,000 K, which implies evolution in the dominant surface composition as the stars cool. The hottest group of transition DO white dwarfs are the pulsating objects of the PG1159 class. The central star of Kl-16 is a related object, as may be the newly discovered very hot star H1504+65, which shows no detected surface features of either hydrogen or helium.

Type
VII Related Objects
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 367 - 385
Copyright
Copyright © Reidel 1986

References

Alcock, C. 1979, in White Dwarfs and Variable Degenerate Stars, Proc. IAU Coll. No. 53, eds. Van Horn, H.M. and Weidemann, V., Univ. of Rochester Press, New York, p. 202.Google Scholar
Alcock, C., and Illariono, A. 1980, Ap. J., 235, 541.Google Scholar
Barlow, M.J., and Hummer, D.G. 1982, in Wolf Ray et Stars: Observations, Physics, Evolution, Proc. IAU Symp. No. 99, eds. de Loore, C.W.H., and A.J.Willis, D. Reidel Publishing Co., Dordrecht, p. 387.Google Scholar
Bond, H.E., Grauer, A.D., Green, R.F., and Liebert, J. 1984, Ap. J., 279, 751.Google Scholar
Boroson, T.A., and Liebert, J. 1986, preprint.Google Scholar
Downes, R.A. 1984, Publ. A.S.P., 96, 807.Google Scholar
Downes, R.A., Liebert, J., and Margon, B. 1985, Ap. J., 290, 321.Google Scholar
Fleming, T., Liebert, J., and Green, R.F. 1986, Ap. J., in press.Google Scholar
Fontaine, G., Villeneuve, B., Wesemael, F. and Wegner, G. 1984, Ap. J., Letters, 277, L51.Google Scholar
Grauer, A.D., and Bond, H.E. 1984, Ap. J., 277, 211.Google Scholar
Grauer, A.D., Liebert, J., Fleming, T., Green, R.F., and Bond, H.E. 1986, preprint.Google Scholar
Green, R.F., Schmidt, M., and Liebert, J. 1986, Ap. J. Suppl., in press.Google Scholar
Greenstein, J.L. 1979, Ap. J., 233, 239.Google Scholar
Greenstein, J.L. 1986, Ap. J., in press.Google Scholar
Greenstein, J.L., Boksenberg, A., Carswell, R., and Shortridge, K. 1977, Ap. J., 212, 186.Google Scholar
Greenstein, J.L., and Sargent, A. 1984, Ap. J. Suppl., 28, 157.Google Scholar
Groth, H.G., Kudritzki, R.P., and Heber, U. 1986, Astr. Ap., in press.Google Scholar
Heber, U., Hunger, K., Jonas, G., and Kudritzki, R.P. 1984, Astr. Ap., 130, 119.Google Scholar
Iben, I., and Renzini, A. 1983, Ann. Rev. Ast. Ap., 21, 271.CrossRefGoogle Scholar
Iben, I., Kaler, J.B., Truran, J.W. and Renzini, A. 1983, Ap. J., 264, 605.Google Scholar
Iben, I., and MacDonald, J. 1985, Ap. J., 296, 540.CrossRefGoogle Scholar
Kaler, J.B., and Feibelman, W.A. 1985, Ap. J., 297, 724.Google Scholar
Kawaler, S.D., Hansen, C.J., and Winget, D.E. 1985, Ap. J., 295, 547.Google Scholar
Koester, D., Liebert, J., and Hege, E.K. 1979, Astr. Ap., 71, 163.Google Scholar
Koester, D., Vauclair, G., Dolez, N., Oke, J.B., Greenstein, J.L., and Weidemann, V. 1985, Astr. Ap., 149, 423.Google Scholar
Koester, D., Weidemann, V., and Zeitler-K.T., E.M. 1982, Astr. Ap., 116, 147.Google Scholar
Liebert, J., Wehrse, R., and Green, R.F. 1986, preprint.Google Scholar
Liebert, J., Wesemael, F., Sion, E.M., and Wegner, G. 1984, Ap. J., 277, 692.CrossRefGoogle Scholar
Liebert, J., Wesemael, F., Hansen, C.J., Fontaine, G., Shipman, H.L., Sion, E.M., Winget, D.E., and Green, R.F. 1986, Ap. J., in press.Google Scholar
McGraw, J.T., Starrfield, S.G., Liebert, J., and Green, R.F. 1979, in IAU Coll. No. 53, White Dwarfs and Variable Degenerate Stars, eds. Van Horn, H.M. and Weidemann, V., Univ. of Rochester Press, Rochester, N.Y., p. 377.Google Scholar
Michaud, G., Fontaine, G. and Charland, Y. 1984, Ap. J., 280, 247.Google Scholar
Nather, R.E., Robinson, E.L., and Stover, R.J. 1979, in IAU Coll. No. 53, White Dwarfs and Variable Degenerate Stars, eds. Van Horn, H.M. and Weidemann, V., Univ. of Rochester Press, Rochester, N.Y., p. 453.Google Scholar
Nousek, J.A., Shipman, H.L., Holberg, J.B., Liebert, J., Pravdo, S.H., White, N.E., and Gioitimi, P. 1986, Ap. J., in press.Google Scholar
Oke, J.B., Weidemann, V., and Koester, D. 1984, Ap. J., 281, 276.Google Scholar
Pelletier, C., Fontaine, G., Wesemael, F., and Michaud, G. 1986, Ap. J., in press.Google Scholar
Pilachowski, C.A., and Milkey, R.W. 1984, Publ.A.S.P., 96, 821.Google Scholar
Pottasch, S.R. 1984, in Planetary Nebulae, Vol. 107, Astrophysics and Space Science Library, D. Reidel Publishing Co., Dordrecht, Figure IX-1, p. 218.Google Scholar
Sanduleak, N. 1971, Ap. J. Letters, 164, L71.Google Scholar
Schönberner, D. 1979, Astr. Ap., 79, 108.Google Scholar
Schönberner, D. 1983, Ap. J., 272, 708.Google Scholar
Shipman, H.L. 1979, Ap. J., 228, 240.Google Scholar
Shipman, H.L., and Greenstein, J.L. 1983, Ap. J., 266, 761.Google Scholar
Shipman, H.L., Liebert, J., and Green, R.F. 1986, in preparation.Google Scholar
Sion, E.M. 1979, in White Dwarfs and Variable Degenerate Stars, Proc. IAU Coll. No. 53, eds. Weidemann, V. and Van Horn, H.M., Univ. of Rochester Press, New York, p. 245.Google Scholar
Sion, E.M. 1984, Ap. J., 282, 612.Google Scholar
Sion, E.M., and Liebert, J. 1977, Ap. J., 213, 468.CrossRefGoogle Scholar
Sion, E.M., Liebert, J., and Starrfield, S.G. 1985, Ap. J., 292, 471 Google Scholar
Sion, E.M., Liebert, J., and Wesemael, F. 1985, Ap. J., 292, 477.Google Scholar
Starrfield, S., Cox, A., Kidman, R.B., and Pesnell, W.D. 1984, Ap. J., 281, 800.Google Scholar
Wegner, G., and Yackovich, F.H. 1984, Ap. J., 284, 257.CrossRefGoogle Scholar
Wehrse, R., and Liebert, J. 1980, Astr. Ap., 83, 184.Google Scholar
Wesemael, F. 1979, Astr. Ap., 72, 104.Google Scholar
Wesemael, F. 1981, Ap. J. Suppl., 45, 177.Google Scholar
Wesemael, F., Green, R.F., and Liebert, J. 1985, Ap. J. Suppl., 58, 379.Google Scholar
Wesemael, F., and Truran, J. 1982, Ap. J., 260, 807.Google Scholar
Wickramasinghe, D.T., and Reid, N. 1983, M.N.R.A.S., 203, 887.Google Scholar
Winget, D.E. and Fontaine, G. 1982, in Pulsations in Classical and Cataclysmic Variables, eds. Cox, J.P. and Hansen, C.J., Boulder: JILA, p. 46.Google Scholar
Winget, D.E., Hansen, C.J., and Van Horn, H. 1983, Nature, 303, 781.Google Scholar
Winget, D.E., Kepler, S.O., Robinson, E.L., Nather, R.E., and O’Donoghue, D. 1985, Ap. J., 292, 606.Google Scholar
Winget, D.E., Robinson, E.L., Nather, R.E., and Fontaine, G. 1982, Ap. J. Letters, 262, Lll.Google Scholar