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The Abundance of Helium in Stellar Interiors*

Published online by Cambridge University Press:  30 March 2016

John Faulkner
John Faulkner*
Affiliation:
Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, Calif., U.S.A.

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From the titles of the other contributions to this morning’s session, one deduces that the hard facts of theory are to be sandwiched between the loose speculations of direct observation. I shall therefore feel free to discuss theoretical implications from stellar structure unencumbered by what are, after all, but peripheral considerations.

I should, however, begin with an apology. It is impossible to do even minimal justice to the vast number of investigations which have contributed to our present understanding (or lack of it). The choice of topics has been dictated in part by history, in part by current relevance, but mainly by personal whim. While much of the discussion centres, for obvious reasons, on Population II work, one or two problems associated with Population I will also be considered. Reference may be made to the exhaustive review article of Iben (1967) and also to the Warner Prize Lecture by Demarque (1968) for background and a more complete discussion of some of the points which will be touched upon here.

I shall assume today that the ‘normal’ helium content of stars is of the order of 25±5% by mass. This leaves me free to pay particular attention to systems which do not appear to adhere to this generalization, systems for which abnormally high or low helium contents have been claimed. The main point of my talk is that there is no really convincing, concrete evidence from stellar interiors alone for helium contents far removed from normal. During the course of the past decade, this has come to be largely accepted. It is in a way sad to see the radicalism of one’s youth become the orthodoxy of middle age.

Type
III. Joint Discussions
Information
Highlights of Astronomy , Volume 2: Highlights of Astronomy. As presented at the XIVth General Assembly of the IAU, 1970 , 1971 , pp. 269 - 287
Copyright
Copyright © Reidel 1971

Footnotes

*

Contributions from the Lick Observatory, No. 333.

References

Alexander, J. B.: 1968, Quart. J. Roy. Astron. Soc. 9, 136.Google Scholar
Arp, H. C.: 1955, Astron. J. 60, 317.Google Scholar
Bahcall, J. N., Bahcall, N. A., and Shaviv, G.: 1968, Phys. Rev. Letters 20, 1209.Google Scholar
Bancali, J. N., Bahcall, N. A., and Ulrich, R. K.: 1969, Astrophys. J. 156, 559.Google Scholar
Bahcall, J. N. and Ulrich, R. K.: 1970, Astrophys. J. 160, L57.Google Scholar
Baschek, B. and Norris, J.: 1970, Astrophys. J. Suppl. No. 176 19, 327.Google Scholar
Bodenheimer, P. H.: 1965, Astrophys. J. 142, 451.Google Scholar
Cameron, A.G.W.: 1970, Commission 35 discussion, IAU.Google Scholar
Catchpole, R. M., Pagel, B.E.J., and Powell, A.L.T.: 1967, Monthly Notices Roy. Astron. Soc. 136, 403.Google Scholar
Cayrel, R.: 1968, Astrophys. J. 151, 997.Google Scholar
Christy, R. F.: 1966, Astrophys. J. 144, 108.CrossRefGoogle Scholar
Christy, R. F.: 1968, Quant. J. Roy. Astron. Soc.> 9, 13.+9,+13.>Google Scholar
Davis, R. Jr., Harmer, D. S., and Hoffmann, K. C.: 1968, Phys. Rev. Letters 20, 1205.Google Scholar
Demarque, P.: 1968, Astron. J. 73, 669.Google Scholar
Demarque, P.: 1970, private communication.Google Scholar
Eggen, O. J.: 1962, Quant. J. Roy. Astron. Soc. 3, 259.Google Scholar
Eggen, O. J.: 1963, Astrophys. J. Suppl. No. 76, 8, 125.Google Scholar
Eggen, O. J.: 1969, Astrophys. J. 156, 241.Google Scholar
Eggen, O. J. and Sandage, A. R.: 1962, Astrophys. J. 136, 735.Google Scholar
Faulkner, J.: 1964, Ph. D. thesis, Univ. of Cambridge, England.Google Scholar
Faulkner, J.: 1966, Astrophys. J. 144, 978.CrossRefGoogle Scholar
Faulkner, J.: 1967, Astrophys. J. 147, 617.CrossRefGoogle Scholar
Faulkner, J. and Iben, I. Jr. 1966, Astrophys. J. 144, 995.Google Scholar
Faulkner, J. and Iben, I. Jr.: 1967, Nature 215, 44.Google Scholar
Garz, T., Kock, M., Richter, J., Baschek, B., Holweger, H., and Unsöld, A.: 1969, Nature 223, 1254.CrossRefGoogle Scholar
Gaustad, J.: 1964, Astrophys. J. 139, 406.CrossRefGoogle Scholar
Greenstein, G. S., Truran, J. W., and Cameron, A.G.W.: 1967, Nature 213, 871.Google Scholar
Greenstein, J. L. and Münch, G.: 1966, Astrophys. J. 146, 618.CrossRefGoogle Scholar
Hartwick, F.D.A., Härm, R., and Schwarzschild, M.: 1968, Astrophys. J. 151, 389.CrossRefGoogle Scholar
Hayashi, C., Hoshi, R., and Sugimoto, D.: 1962, Progr. Theoret. Phys. Suppl. No. 22, 1.Google Scholar
Hegyi, D. and Curott, D.: 1970, Phys. Rev. Letters 24, 415.CrossRefGoogle Scholar
Henyey, L. G.: 1970, private communication.Google Scholar
Hodge, P. W. and Wallerstein, G.: 1966, Publ. Astron. Soc. Pacific 78, 411.Google Scholar
Hubbard, W. B. and Lampe, M.: 1969, Astrophys. J. Suppl. No. 163, 18, 297.Google Scholar
Iben, I. Jr.: 1967, Ann. Rev. Astron. Astrophys. 5, 600.CrossRefGoogle Scholar
Iben, I. Jr.: 1968a, Nature 220, 143.CrossRefGoogle Scholar
Iben, I. Jr.: 1968b, Phys. Rev. Letters 21, 1208.CrossRefGoogle Scholar
Iben, I. Jr.: 1969, Ann. Phys. 54, 164.CrossRefGoogle Scholar
Iben, I. Jr., and Faulkner, J.: 1968, Astrophys. J. 153, 101.Google Scholar
Iben, L. Jr., and Rood, R.: 1970a, Astrophys. J. 159, 605.Google Scholar
Iben, I. Jr. and Rood, R.: 1970b, Astrophys. J. 161, 587.Google Scholar
Iben, I. Jr., Rood, R., Strom, K. M., and Strom, S. E.: 1969, Nature 224, 1006.CrossRefGoogle Scholar
Lambert, D. L.: 1968a, Observatory 87, 228.Google Scholar
Lambert, D. L.: 1968b, Monthly Notices Roy. Astron. Soc. 138, 143.Google Scholar
Lambert, D. L. and Warner, B.: 1968a, Ibid. 181.Google Scholar
Lambert, D. L. and Warner, B.: 1968b, Ibid. 213.Google Scholar
Lambert, D. L. and Warner, B.: 1968c, Ibid. 229.Google Scholar
Lambert, D. L. and Warner, B.: 1968d, Monthly Notices Roy. Astron. Soc. 140, 197.Google Scholar
Lippincott, S. L. and Wyckoff, S.: 1964, Astron. J. 69, 471.Google Scholar
Michaud, G.: 1970, Astrophys. J. 160, 641.CrossRefGoogle Scholar
Newell, E. B., Rodgers, A. W., and Searle, L.: 1969, Astrophys. J. 156, 597.Google Scholar
Norris, J.: 1970a, Astrophys. J. Suppl. No. 176 19, 337.Google Scholar
Norris, J.: 1970b, private communication.Google Scholar
Popper, D. M., Jørgensen, H. E., Morton, D. C., and Leckrone, D. S.: 1970, Astrophys. J. 161, L57.CrossRefGoogle Scholar
Sargent, W.L.W. and Searle, L.: 1966, Astrophys. J. 145, 652.Google Scholar
Sargent, W.L.W. and Searle, L.: 1967, Astrophys. J. 150, L33.Google Scholar
Sargent, W.L.W. and Searle, L.: 1968, Astrophys. J. 152, 443.Google Scholar
Sargent, W.L.W. and Strittmatter, P. A.: 1966, Astrophys. J. 145, 938.CrossRefGoogle Scholar
Schwarzschild, M.: 1970, Remarks at the 132nd meeting of the American Astronomical Society, Boulder, Colorado, U.S.A..Google Scholar
Schwarzschild, M. and Härm, R.: 1970, Astrophys. J. 160, 341.Google Scholar
Searle, L. and Rodgers, A. W.: 1966, Astrophys. J. 143, 809.Google Scholar
Sears, R. L.: 1964, Astrophys. J. 140, 477.Google Scholar
Shaviv, G.: 1970, Commission 35 discussion, IAU.Google Scholar
Strom, S. E. and Strom, K. M.: 1967, Astrophys. J. 150, 501.Google Scholar
Wagman, N. E.: 1961, Astron. J. 66, 433.Google Scholar
Wallerstein, G.: 1970, Astrophys. J. 160, 345.Google Scholar
Warner, B.: 1968, Monthly Notices Roy. Astron. Soc. 138, 229.Google Scholar
Watson, W. D.: 1969a, Astrophys. J. 157, 375.Google Scholar
Watson, W. D.: 1969b, Astrophys. J. 158, 303.Google Scholar
Watson, W. D.: 1969c, Ibid. L189.Google Scholar
Wayman, P. A.: 1967, Publ. Astron. Soc. Pacific 79, 156.Google Scholar
Wayman, P. A., Symms, L.S.T., and Blackwell, K. C.: 1965, Roy. Obs. Bull. No. 98.Google Scholar
Wehinger, P. A. and Wyckoff, S.: 1966, Astron. J. 71, 185.Google Scholar