Hot subluminous stars

  • Ulrich Heber
V. Evolved Stars
Part of the Lecture Notes in Physics book series (LNP, volume 401)


Spectroscopic analyses of blue horizontal branch stars, subluminous B- and O-stars are reviewed. These classes of stars trace stellar evolution from the horizontal branch towards the white dwarf cooling sequence. The resulting atmospheric parameters and abundances are used to obtain constraints on the evolutionary status of the different classes of stars. The sdB stars form a homogeneous group and can be identified with models of the extended horizontal branch. Abundance anomalies (deficiency of helium and some metals, enrichment of 3He) observed in Horizontal Branch stars and sdB stars are caused by atmospheric diffusion. The class of subluminous O stars is much less homogenous and two subclasses can be defined: the “compact” sdO stars probably evolved from the extended horizontal branch and are hence successors of the sdBs, whereas some sdOs of relatively low gravity are in a post-AGB stage of evolution. Hot subdwarfs in binary systems can be formed by case B or case C mass transfer.


Globular Cluster Planetary Nebula Horizontal Branch Helium Abundance Visual Binary 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Adams, S., Seaton, M.J., Howarth, I.D., Auriere, M., Walsh, J.R. 1984: MNRAS 207, 471.Google Scholar
  2. Auer, L.H., Mihalas, D. 1969: ApJ 158, 641.Google Scholar
  3. Balona, L.A., Lloyd Evans, T., Simon, T., Sonneborn, G. 1987: IBVS, 3061.Google Scholar
  4. Baschek, B., Norris, J. 1975: ApJ 199, 694.Google Scholar
  5. Baschek, B., Sargent, A.I. 1976: A&A 53, 47.Google Scholar
  6. Baschek, B., Kudritzki, R.P., Scholz, M., Simon, K.P. 1982a: A&A 108, 387.Google Scholar
  7. Baschek, B., Höflich, P., Scholz, M. 1982b: A&A 112, 76.Google Scholar
  8. Bailyn, C.D., Iben, I., Jr. 1989: ApJ 347, L21.Google Scholar
  9. Bauer, F. 1991: PhD thesis, LMU München Google Scholar
  10. Bixler, Bowyer, S., Laget, M. 1991: A&A 250, 370.Google Scholar
  11. Cohen, J.G., Gillet, F.C. 1989: ApJ 346, 803.Google Scholar
  12. Caloi, V. 1989: A&A 221, 27.Google Scholar
  13. Crocker, D.A., Rood, R.T., O'Connell, R.W. 1989: ApJ 332, 236.Google Scholar
  14. de Boer, K.S. 1985: A&A 142, 321.Google Scholar
  15. de Boer, K.S., Heber, U., Richtler, T. 1988: A&A 202, 113.Google Scholar
  16. Dreizler, S., Heber, U., Werner, K., Moehler, S., de Boer, K.S. 1990: A&A 235, 234.Google Scholar
  17. Drilling, J.S, Heber, U. 1987:IA U Coll. 95: The Second Conference on Faint Blue Stars, eds. A.G.D. Philip, D.S. Hayes and J. Liebert, Schenectady: Davis Press, p. 603.Google Scholar
  18. Drukier, G.A., Fahlman, G.G., Richer, H.B. 1989: ApJ 342, L27.Google Scholar
  19. Dworetsky, M.M., Lanning, H.H., Etzel, P.B., Patenaude, D.J. 1977: MNRAS 181, 13P.Google Scholar
  20. Fekel, F.C., Simon, T. 1985: AJ 90, 812.Google Scholar
  21. Ferguson, D.H., Green, R.F., Liebert, J. 1984: ApJ 287, 320.Google Scholar
  22. Giddings, J.R. 1980: Ph.D. thesis, UCL, London Google Scholar
  23. Glaspey, J.W., Demers, S., Moffat, A.F.J., Shara, M. 1985: ApJ 289, 326.Google Scholar
  24. Green, R.F., Schmidt, M., Liebert, J. 1986: ApJS 61, 305.Google Scholar
  25. Greenstein, G.S., Truran, J.W., Cameron, A.G.W. 1967: Nature 213, 871.Google Scholar
  26. Greenstein, J.L. 1966: ApJ 144, 496.Google Scholar
  27. Greenstein, J.L., Sargent, A.I. 1974: ApJS 28, 157.Google Scholar
  28. Greggio, L., Renzini, A. 1990: ApJ 364, 35.Google Scholar
  29. Groth, H.G., Kudritzki, R.P., Heber, U. 1985: A&A 152, 107 (GKH).Google Scholar
  30. Gruschinske, J., Hunger, K., Kudritzki, R.P., Simon, K.P. 1980: ESA SP-157, 311.Google Scholar
  31. Gruschinske, J., Hamann, W.-R., Kudritzki, R.-P., Simon, K.P., Kaufmann, J.P. 1983: A&A 121, 85.Google Scholar
  32. Hamann, W.-R., Gruschinske, J., Kudritzki, R.P., Simon, K.P. 1981: A&A 104, 249.Google Scholar
  33. Hartoog, M.R. 1979: ApJ 231, 161.Google Scholar
  34. Hartoog, M.R., Cowley, A.P. 1979: ApJ 228, 229.Google Scholar
  35. Heber, U. 1986: A&A 155, 33.Google Scholar
  36. Heber, U. 1987a: Mitt. Astron. Ges. 70, 71.Google Scholar
  37. Heber, U. 1987b: IAU Coll. 95: The Second Conference on Faint Blue Stars, eds. A.G.D. Philip, D.S. Hayes and J. Liebert, Schenectady: Davis Press, p. 79.Google Scholar
  38. Heber, U. 1991: Proc. IAU symp. No. 145, Kluwer, p. 363.Google Scholar
  39. Heber, U., Kudritzki, R.P. 1986: A&A 169, 244.Google Scholar
  40. Heber, U., Langhans, G. 1986: in: New Insights in Astrophysics, ESA-SP 263, 279.Google Scholar
  41. Heber, U., Hunger, K. 1987: IA U Coll. 95: The Second Conference on Faint Blue Stars, eds. A.G.D. Philip, D.S. Hayes and J. Liebert, Schenectady: Davis Press, p. 599.Google Scholar
  42. Heber, U., Hunger, K., Jonas, G., Kudritzki, R.P. 1984a: A&A 130, 119.Google Scholar
  43. Heber, U., Hamann, W.-R., Hunger, K., Kudritzki, R.P., Simon, K.P., Mendez, R.H. 1984b: A&A 136, 331.Google Scholar
  44. Heber, U., Kudritzki, R.P., Caloi, V., Castellani, V., Danziger, J., Gilmozzi, R. 1986: A&A 162, 171.Google Scholar
  45. Heber, U., Dreizler, S., de Boer, K.S., Moehler, S., Richtler, T. 1988: Astron. Ges. Abs. Ser. 1, 16.Google Scholar
  46. Howarth, I.D. 1987: MNRAS 226, 249.Google Scholar
  47. Howarth, I.D., Heber, U. 1991: PASP 102, 912.Google Scholar
  48. Hubeny, I., Heap, S.R., Altner, B. 1991: ApJ 377, L33.Google Scholar
  49. Hunger, K., Gruschinske, J., Kudritzki, R.P., Simon, K.P. 1981: tA&A 95, 244.Google Scholar
  50. Husfeld, D., Butler, K., Heber, U., Drilling, J.S. 1989: A&A 222, 150.Google Scholar
  51. Iben, I., Jr. 1990: ApJ 353, 215.Google Scholar
  52. Iben, I., Jr., Kaler, J.B., Truran, J.W., Renzini, A. 1983: ApJ 264, 605.Google Scholar
  53. Iben, I., Jr., Tutukov, A.V. 1986: ApJ 311, 742.Google Scholar
  54. Jeffery, C.S., Simon, T., Lloyd Evans, T. 1992: MNRAS, submitted.Google Scholar
  55. Kilkenny, D. 1986: Observatory 106, 160.Google Scholar
  56. Kilkenny, D., Hilditch, R.W., Penfold, J.E. 1987: MNRAS 183, 523.Google Scholar
  57. Kilkenny, D., Heber, U., Hunger, K. 1986: A&A 155, 175.Google Scholar
  58. Kilkenny, D., Heber, U., Drilling, J.S. 1988: SAAO Circulars 12, 1.Google Scholar
  59. Kudritzki, R.P. 1987: IA U Coll. 95: The Second Conference on Faint Blue Stars, eds. A.G.D. Philip, D.S. Hayes and J. Liebert, Schenectady: Davis Press, p. 177.Google Scholar
  60. Kudritzki, R.P., Simon, K.P. 1978: A&A 70, 653.Google Scholar
  61. Kudritzki, R.P., Hunger, K., Gruschinske, J., Simon, K.P., Kaufmann, J.P. 1980: ESA SP 157, 307.Google Scholar
  62. Kudritzki, R.P., Simon, K.P., Lynas-Gray, A.E., Kilkenny, D., Hill, P.W. 1982: A&A 106, 254.Google Scholar
  63. Lamontagne, R., Wesemael, F., Fontaine, G., Sion, E.M. 1985: ApJ 299, 496.Google Scholar
  64. Lamontagne, R., Wesemael, F., Fontaine, G. 1987: ApJ 318, 844.Google Scholar
  65. Lynas-Gray, A.E., Heber, U., Kudritzki, R.P., Simon, K.P. 1984: ESA SP-218, 285.Google Scholar
  66. Mendez, R.H. 1991: in: Stellar Atmospheres: Beyond Classical Models, eds L. Crivellari, I. Hubeny, D.G. Hummer, Kluwer, p. 331.Google Scholar
  67. Mengel, J.G., Norris, J., Gross, P.G. 1976: ApJ 204, 488.Google Scholar
  68. Menzies, J.W., Marang, F. 1986: in: Instrumentation and Research Programmes for small telescopes, Kluwer, p.305.Google Scholar
  69. Michaud, G., Bergeron, P., Wesemael, F., Fontaine, G. 1985: ApJ 299, 741.Google Scholar
  70. Michaud, G., Bergeron, P., Heber, U., Wesemael, F. 1989: ApJ 338, 417.Google Scholar
  71. Moehler, S., Heber, U., de Boer, K.S. 1990: A&A 239, 265.Google Scholar
  72. Moehler, S., Richtler, T., de Boer, K.S., Dettmar, R.J., Heber, U. 1990: A&AS 86, 53.Google Scholar
  73. Newell, E.B. 1973: ApJS 26, 37.Google Scholar
  74. Newell, B., Graham, J.A. 1976: ApJ 204, 804.Google Scholar
  75. Olsen, E.H. 1980: IBVS, No. 1770.Google Scholar
  76. Rauch, T., Heber, U., Hunger, K., Werner, K., Neckel, Th. 1990: A&A 241, 457.Google Scholar
  77. Richter, D. 1971: A&A 14, 415.Google Scholar
  78. Saffer, R.A., Bergeron, P., Liebert, J., Koester, D. 1991: in: White Dwarfs, eds. G. Vauclair and E. Sion, Kluwer, p. 53.Google Scholar
  79. Sargent, W.L.W, Searle, L. 1968: ApJ 152, 443.Google Scholar
  80. Schönberner, D. 1978: A&A 70, 451.Google Scholar
  81. Schönberner, D., Drilling, J.S. 1984: ApJ 278, 702.Google Scholar
  82. Schulz, H., Heber, U., Wegner, G. 1991: PASP 103, 435.Google Scholar
  83. Simon, K.P. 1982: A&A 107, 313.Google Scholar
  84. Simon, K.P., Gruschinske, J., Hunger, K., Kudritzki, R.P. 1980: ESA SP- 157 305.Google Scholar
  85. Thackeray, A.D. 1970: MNRAS 150, 215.Google Scholar
  86. Tout, C.A., Eggleton, P.P. 1988a: ApJ 334, 357.Google Scholar
  87. Tout, C.A., Eggleton, P.P. 1988b: MNRAS 231, 823.Google Scholar
  88. Tutukov, A.V., Yungelson, L.R. 1990: Sov. Astron. 34, 57.Google Scholar
  89. Unglaub, K., Bues, I. 1990: A&A 233, 159.Google Scholar
  90. Vauclair, G., Liebert, J. 1987: in: Exploring the Universe with the IUE Satellite ed. Y. Kondo, Reidel, Dordrecht, 355.Google Scholar
  91. Viton, M., Deleuil, M., Tobin, W., Prevot, L., Bouchet, P. 1991: A&A 242, 175.Google Scholar
  92. Wallerstein, G., Spinrad, H. 1960: PASP 72, 486.Google Scholar
  93. Wallerstein, G., Wolff, S.C. 1966: PASP 78, 390.Google Scholar
  94. Werner, K. 1986: A&A 161, 177.Google Scholar
  95. Werner, K. 1988: A&A 204, 159.Google Scholar
  96. Werner, K., Husfeld, D. 1985: A&A 148, 417.Google Scholar
  97. Werner, K., Heber, U., Hunger, K. 1991: A&A 244, 437.Google Scholar
  98. Wesemael, F., Auer, L.H., Van Horn, H.M., Savedoff, M.P. 1980: ApJS 43, 159.Google Scholar
  99. Wesemael, F., Winget, D.E., Cabot, W., van Horn, H.M., Fontaine, G. 1982: ApJ 254, 221.Google Scholar
  100. Winget, D.E., Cabot, W. 1980: ApJ 242, 1166.Google Scholar
  101. Young, A., Nelson, B., Mielbrecht, R. 1972: ApJ 174, 27.Google Scholar
  102. Young, A., Wentworth, S.T. 1982: PASP 94, 815.Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Ulrich Heber
    • 1
  1. 1.Institut für Theoretische Physik und Sternwarte der Universität KielKielGermany

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