Earth, Moon, and Planets

, Volume 60, Issue 1, pp 69–79 | Cite as

Gas and dust release from comet West (1976VI) nuclear fragments

  • A. A. de Almeida
Article

Abstract

Emission fluxes of CN, G2 and C3 carbon-bearing molecular species observed in the spectra of the nuclear fragment A and D of comet West (1976VI) are analysed in the framework of Haser's two-component model with radial outflow symmetry. Gas production rates have been derived and their ratios obtained. We find these vary as Qαr n (where 1.0≤r≤2.6 is the heliocentric distance in AU) with photometric parametern = -4.11 (CN), -2.68 (C2), -1.89 (C3) andQ x /Q y αr n withn = 2.22 (C3/CN), 1.42 (C2/CN), -0.79 (C2/C3). The gas-to-dust ratio, dust production rates in arbitrary units, total number of dust particles in the field of view and an effective radius Reff ≃ 2.0 km for the principal nuclear fragmentA is also estimated.

Keywords

Dust Production Rate Dust Particle Arbitrary Unit Molecular Species 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. A'Hearn, M. F. and Cowan, J. J.: 1975,Astron. J. 80, 852.Google Scholar
  2. A'Hearn, M. F., Thurber, C. H. and Millis, R. L.: 1977,Astron. J. 82, 518.Google Scholar
  3. A'Hearn, M. F., Millis, R. L. and Birch, P. V.: 1979,Astron. J. 84, 570.Google Scholar
  4. A'Hearn, M. F., Hanisch, R. J. and Thurber, C. H.: 1980,Astron. J. 85, 74.Google Scholar
  5. Butterworth, P. S.: 1984,Vistas in Astron. 27, 361.Google Scholar
  6. Churyumov, K. I. and Rosenbush, V. K.: 1991,Astron. Nachr. 312, 385.Google Scholar
  7. Cochran, A. L.: 1985,Astron. J. 90, 2609.Google Scholar
  8. Cochran, A. L.: 1987,Astron. J. 93, 231.Google Scholar
  9. de Ahneida, A. A., Singh, P. D. and Burgoyne, C. M.: 1989,Earth, Moon and Planets 47, 15.Google Scholar
  10. de Almeida, A. A.: 1991,Earth, Moon and Planets 53, 205.Google Scholar
  11. de Ahneida, A. A.: 1992,Earth, Moon and Planets 56, 61.Google Scholar
  12. Delsemme, A. H.: 1982 in L. L. Wilkening (ed.), Comets, The University of Arizona Press, p. 85.Google Scholar
  13. Haser, L.: 1957, Liège Inst. Astrophys. Reprint No. 394.Google Scholar
  14. Konno, I. and Wickoff, S.: 1989,Adv. Space Res. 9, 163.Google Scholar
  15. Marsden, B. G.: 1976, Int. Astron. Union Circ. No. 2988.Google Scholar
  16. Newburn, R. L. and Johnson, T. V.: 1978,Icarus 35, 360.Google Scholar
  17. Newburn, R. L. and Spinrad, H.: 1984,Astron J. 89, 289.Google Scholar
  18. Newburn, R. L. and Spinrad, H.: 1985,Astron. J. 90, 2609.Google Scholar
  19. O'Dell, C. R. and Osterbrock, D. E.: 1962,Astrophys. J. 136, 559.Google Scholar
  20. O'Dell, C. R.: 1973,Icarus 19, 137.Google Scholar
  21. Rosenbush, V. K.: 1986,Icarus 66, 230.Google Scholar
  22. Sekanina, Z.: 1976,Sky and Telesc. 51, 386.Google Scholar
  23. Sekanina, Z.: 1978,Icarus 33, 173.Google Scholar
  24. Sekanina, Z.: 1982, in L. L. Wilkening (ed.), Comments, The University of Arizona Press, p. 251.Google Scholar
  25. Tatum, J. B. and Gillespie, M. I.: 1977,Astrophys. J. 218, 569.Google Scholar
  26. Tatum, J. B.: 1984,Astron. Astrophys. 135, 183.Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • A. A. de Almeida
    • 1
  1. 1.Department of AstronomyInstitute of Astronomy and Geophysics University of São PauloBrazil

Personalised recommendations