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Comets, Interstellar Clouds and Star Clusters

Published online by Cambridge University Press:  12 April 2016

B. Donn

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It is now a generally accepted concept that comets are a residue of the early history of the solar system from the time when the planets were forming. Because of the approximately 0.1% loss of material from the nucleus during perihelion passage near 1 A.U., lifetimes of short period comets are limited to 104-105 years. This requires an astronomically recent source of the comets seen at the present epoch. From the statistics of the aphelia of parabolic and long period comets, Oort (1951) proposed the existence of a comet cloud between 50,000 and 100,000 A.U. which serves as a reservoir from which presently observed comets have recently been perturbed. Although there are various difficulties with populating the cloud (Opik, 1973) and its subsequent evolution (I.A.U. Symposium 45, 1972; Everhart, 1974) it is the basis for nearly all current studies on the origin and evolution of comets.

Type
Part II
Information
International Astronomical Union Colloquium , Volume 25 , Issue Part2: The Study of Comets , 1976 , pp. 663 - 672
Copyright
Copyright © NASA 1976

References

Aveni, A.F. and Hunter, T.H. Jr. 1967, Astron. J. 92, 1019.10.1086/110378CrossRefGoogle Scholar
Aveni, A.F. and Hunter, T.H. Jr. 1969, Astron. J. 74, 1022.10.1086/110897CrossRefGoogle Scholar
Aveni, A. F. and Hunter, T. H. Jr., 1972, Astron. J. 77, 17.CrossRefGoogle Scholar
Blaauw, A. 1964, An. Rev. Astr. and Ap. 2, 213.CrossRefGoogle Scholar
Cameron, A.G.W. 1973, Icarus 18, 407.10.1016/0019-1035(73)90153-XCrossRefGoogle Scholar
Donn, B.D. 1973, Bull. A.A.S. 5, 342.Google Scholar
Donn, B.D. and Stief, L.J. 1974, Bull. A.A.S. 6, 221.Google Scholar
Ebert, R., von Hoerner, S., and Temesvary, S. Die Entstehung von Sterner, Springer Verlag, Berlin, 1969.Google Scholar
Everhart, , 1974, I.A.U. Coll. 52, The Study of Comets, in press.Google Scholar
Greenberg, J.M. 1974, Ap.J. 189, L81.10.1086/181470CrossRefGoogle Scholar
Greenstein, J., Neugebauer, G. and Beklin, E. 1970, Ap.J. 161, 519.10.1086/150556CrossRefGoogle Scholar
Hartman, , 1970, “Evolution Stellaire Avant la Sequence Principle,” 16 Liege Astrophysics Symp., Liege, also Mem. Soc. Roy. Sci. Liege. 15 Se, 19, 49.Google Scholar
Herbig, G.H. 1962, Advances in Astronomy and Astrophysics 1, 47.CrossRefGoogle Scholar
Herbig, G.H. 1970, “Evolution Stellaire Avant la Sequence Principale,” 16 Liege Astrophysics Symp., Liege, also Mem. Soc. Roy. Sci. Liege 5th Se, 19, 13.Google Scholar
Hoxie, D.T. 1970, Ap.J. 161, 1083.CrossRefGoogle Scholar
IAU Symp. 1972, “The Motion, Evolution of Orbits and Origin of Comets,” ed. by Chebotarev, G.A., Kazimirchak-Polonskaya, E.I., , E.I. and Marsden, B.G., D. Reidel, Dordrecht, Holland.10.1007/978-94-010-2873-8CrossRefGoogle Scholar
Iben, I. Jr. 1967, Ap.J. 147, 624.10.1086/149040CrossRefGoogle Scholar
Larson, R.B. 1973, M.N. 161, 133.Google Scholar
Oort, J.H. 1950, B.A.N. 11, 91.Google Scholar
Opik, E. 1973, Astrophys. and Sp. Sci. 21, 307.CrossRefGoogle Scholar
Roberts, M.S. 1957, Pub. A.S.P. 69, 59.10.1086/127013CrossRefGoogle Scholar
Salpeter, E.E. 1959, Ap.J. 129, 608.CrossRefGoogle Scholar
Spitzer, L.J. Jr., Ch. 9 Stars and Stellar Systems, V. 7, ed. by Aller, L.H. and Middlehurst, B., U. Chicago Press, 1968.Google Scholar
Straka, W.C. 1971a, Ap.J. 164, 125;10.1086/150823CrossRefGoogle Scholar
Straka, W.C. 1971b, Ap.J. 165, 109.CrossRefGoogle Scholar
Tinsley, B. and Cameron, A.G.W. 1974, Astrophys. and Sp. Sci. 31, 31.10.1007/BF00642598CrossRefGoogle Scholar
van Altena, , 1966, A.J. 71, 482.10.1086/109952CrossRefGoogle Scholar
van de Kamp, P. 1971, Ann. Rev. Astr. and Ap. 9, 103.CrossRefGoogle Scholar