Hostname: page-component-76fb5796d-r6qrq Total loading time: 0 Render date: 2024-04-25T13:07:37.466Z Has data issue: false hasContentIssue false
  • English
  • Français

Arguments Indicating that Ap and Am Stars are Evolved Spectroscopic Binaries

Published online by Cambridge University Press:  30 March 2016

E.P.J. van den Heuvel
E.P.J. van den Heuvel*
Affiliation:
Sterrenwacht ‘Sonnenborgh’, Utrecht, The Netherlands, and Sterrenkundig Instituut der Vrije Universiteit, Brussels, Belgium

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Roughly three types of evolution of spectroscopic binaries may occur:

Case (a): the primary fills its Roche limit already before the end of core hydrogen burning;

Case (b): the primary fills its Roche limit after core hydrogen exhaustion but before the onset of helium burning, and

Case (c): the primary does not fill its Roche limit before the end of core helium burning.

Since long-period variables of Population I as well as Population II may reach radii of 10 AU, case (c) will occur in systems with periods up to 100 years. Since about 50% of the A and B stars are spectroscopic binaries, many evolved spectroscopic binaries are expected to occur in the galactic system. Computations show that, using the mass-ratio distribution of unevolved systems derived by Kuiper, the number of systems with one evolved component is expected to be at least as large as the number of unevolved systems, in the spectral regions A and B.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 1: Highlights of Astronomy. As presented at the XIIIth General Assembly of the IAU, 1967 , 1968 , pp. 420 - 431
Copyright
Copyright © Reidel 1968

References

1. Kippenhahn, R., Weigert, A. (1967) Z. Astrophys., 65, 251.Google Scholar
2. Kippenhahn, R., Kohl, K., Weigert, A. (1967) Z. Astrophys., 66, 58.Google Scholar
3. Paczyński, B. (1966) Acta astr., 16, 231.Google Scholar
4. Paczyński, B. (1967) Acta astr., 17, 1.Google Scholar
5. Paczyński, B., Ziolkowski, J. (1967) Acta astr., 17, 7.Google Scholar
6. Plavec, M. (1967) On the evolution of double stars, ed. Dommanget, J. (Obs. Royal, Uccles, Belgium), p. 83.Google Scholar
7. Smak, J. (1964) Astrophys. J., Suppl. 11, 141.CrossRefGoogle Scholar
8. Batten, A. (1967) A. Rev. Astr. Astrophys., 5, 25.CrossRefGoogle Scholar
9. Van den Heuvel, E.P.J. (1968) Bull. astr. Inst. Netherl., 19, 326.Google Scholar
10. Kuiper, G.P. (1935) Publ. astr. Soc. Pacific, 71, 451.Google Scholar
11. McCrea, W.H. (1964) Mon. Not. R. astr. Soc, 128, 147.CrossRefGoogle Scholar
12. Hack, M. (1963) in Star Evolution, Ed. by Gratton, P., Academic Press, New York, p. 452.Google Scholar
13. Huang, Su-Shu (1966) A. Rev. Astr. Astrophys., 4, 35.CrossRefGoogle Scholar
14. Plaut, L. (1959) Publ. astr. Soc. Pacific, 71, 167.CrossRefGoogle Scholar
15. Van den Heuvel, E.P.J. (1968) Bull. astr. Inst. Netherl. (in press).Google Scholar
16. Struve, O. (1963) Publ. astr. Soc. Pacific, 75, 207.CrossRefGoogle Scholar
17. Struve, O. (1946) Astrophys. J., 103, 76.CrossRefGoogle Scholar
18. Fowler, W.A., Burbidge, E.M., Burbidge, G.R., Hoyle, F. (1965) Astrophys. J., 142, 423.CrossRefGoogle Scholar
19. Eggen, O.J. (1965) A. Rev. astr. Astrophys., 3, 235.CrossRefGoogle Scholar
20. Abt, H.A., Conti, P.S., Deutsch, A.J., Wallerstein, G. (1966) Paper presented at the 122nd Meeting of the AAS.Google Scholar
21. Hyland, A.R. (1967) Proc. astr. Soc. Australia, 1, 14.CrossRefGoogle Scholar
22. Baschek, B., Oke, J.B. (1965) Astrophys. J., 141, 1404.CrossRefGoogle Scholar
23. Van’t Veer-Menneret, C. (1966) in IA U Symp. 26, Ed. by Hubenet, H., Academie Press, New York, p. 261.Google Scholar
24. Abt, H.A. (1961) Astrophys. J., Suppl. 6, 37.CrossRefGoogle Scholar
25. Kraft, R.P. (1965) Astrophys. J., 142, 703.CrossRefGoogle Scholar
26. Sargent, W.L.W., Strittmatter, P.A. (1966) Astrophys. J., 145, 938.CrossRefGoogle Scholar
27. Van den Heuvel, E.P.J. (1967) Bull. astr. Inst. Netherl., 19, 11.Google Scholar
28. Schöneich, W. (1967) Astr. Nachr., 61, 290.Google Scholar
29. Sargent, W.L.W. (1966) in I AU Symp. 26, Ed. by Hubenet, H., Academic Press, New York, p. 247.Google Scholar
30. Conti, P.S. (1965) Astrophys. J., 142, 1594.CrossRefGoogle Scholar
31. Kraft, R.P. (1965) Astrophys. J., 142, 681.CrossRefGoogle Scholar
32. Renson, P. (1965) Ann. Astrophys., 28, 679.Google Scholar
33. Huang, Su-Shu (1963) Astrophys. J., 138, 471.CrossRefGoogle Scholar
34. Eggen, O.J., Greenstein, J.L. (1965) Astrophys. J., 141, 83.CrossRefGoogle Scholar
35. Moore, J.H., Neubauer, F.J. (1948) Lick Obs. Bull., 20, 1.Google Scholar
36. Jaschek, C, Jaschek, M. (1958) Z. Astrophys., 45, 35.Google Scholar
37. Abt, H.A. (1965) Astrophys. J., Suppl. 11, 429.CrossRefGoogle Scholar
38. Conti, P.S., Wallerstein, G., Wing, F. (1965) Astrophys. J., 142, 423.Google Scholar
39. Conti, P.S., Strom, S.E. (1967) Astrophys. J. (in press).Google Scholar
40. Johnson, H.L., Knuckless, C.F. (1955) Astrophys. J., 122, 209.CrossRefGoogle Scholar
41. Treanor, P.J. (1960) Mon. Not. R. astr. Soc, 121, 503.CrossRefGoogle Scholar
42. Eggen, O.J. (1963) Astr. J., 68, 483.CrossRefGoogle Scholar
43. Eggen, O.J. (1963) Astrophys. J., Suppl. 76.Google Scholar
44. Feinstein, A. (1966) Publ. astr. Soc. Pacifie, 78, 301.CrossRefGoogle Scholar