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Space Science Reviews

, Volume 90, Issue 1–2, pp 83–89 | Cite as

Hale-Bopp and Its Sodium Tails

  • G. Cremonese
Article

Abstract

The sodium emissions have been observed in several new and long-period comets, but only for comet Mrkos 1957d (Nguyen-Huu-Doan, 1960) was a sodium tail detected on a Schmidt plate obtained with a objective prism. Comet Hale-Bopp 1995 O1 offered the first great opportunity to get an image of a long sodium tail. It was more than 3 × 107 km long, defined as a third type of tail, as it was composed only of neutral atoms (Cremonese, 1997a). After the discovery of the sodium tail another team announced it had observed it (Wilson et al., 1998), but it was soon realized they had seen a different sodium tail. The image of Wilson et al. (1998) showed a very diffuse sodium tail superimposed on the dust tail, most likely due to the release of sodium atoms from dust particles. It was different from the narrow tail found in the image obtained by the European Hale-Bopp Team and its position angle was 15-20 degrees lower. Spectroscopic observations have been performed on the dust tail, at different beta values, and along the narrow sodium tail showing that the sodium emissions had very different line profiles. The analysis of these profiles will yield important insights into the sources in the inner coma and in the dust tail. This work will report on preliminary analysis of both sodium tails and emphasize the high-resolution spectroscopy performed on the dust tail.

Keywords

Dust Particle Solar Radiation Pressure Extended Source Slit Position Dust Tail 
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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References

  1. Arpigny, C., Rauer, H., Manfroid, J., Hutsemèkers, D., Jehin, E., Crovisier, J., Jorda,L.: 1998,’ Production and kinematics of sodium atoms in the coma of comet Hale-Bopp’, A&A 334, L53.ADSGoogle Scholar
  2. Brown, M.E., Bouches, A.H., Spinrad, H., Misch, A.: 1998,’ Sodiumvelocities and sources in Hale-Bopp’, Icarus 134, 228.CrossRefADSGoogle Scholar
  3. Combi, M. R., Di Santi, M. A., Fink, U.:1997,’ The spatial distribution of gaseous atomic sodium in the comae of comets: evidence for direct nucleus and extended plasma sources’, Icarus 130, 336.CrossRefADSGoogle Scholar
  4. Cremonese, G., and the European Hale-BoppTeam: 1997a, IAU Circ. 6631.Google Scholar
  5. Cremonese, G., Boehnhardt, H., Crovisier, J., Fitzsimmons, A., Fulle, M., Licandro, J., Pollacco, D., Rauer, H., Tozzi, G.P., West, R.M.: 1997b,’ Neutral sodium from comet Hale-Bopp: a third type of tail’, ApJ 490, L199.CrossRefADSGoogle Scholar
  6. Cremonese G., Fulle, M.: 1999,'Sodium in comets’, Earth, Moon and Planets, in press.Google Scholar
  7. Huebner, W. F.: 1970,’ Dust fromcometary nuclei’, A&A 5, 286.ADSGoogle Scholar
  8. Huebner, W. F., Keady, J. J., Lyon, S. P.: 1992,'Solar photo rates for planetary atmospheres and atmospheric pollutants – index of species – full names and chemical structures’, Ap&SS 195, 1.ADSGoogle Scholar
  9. Mendillo, M., Wilson, J.K., Baumgardner, J., Cremonese,G., Barbieri, C.: 1998,’ Imaging studies of sodium tails in comets’, DPS meeting 30, 29.01.Google Scholar
  10. Newall, H.F., 1910,’ The spectrum of the daylight comet 1910a’, MNRAS 70, 459.ADSGoogle Scholar
  11. Nguyen-Huu-Doan: 1960,’ Le spectre de la comete Mrkos 1957d’, Journal des Observateurs 43, 61.ADSGoogle Scholar
  12. Oppenheimer, M.: 1980,’ Sodium D-line emission in comet West (1975n) and the sodium source incomets’, ApJ 240, 923.CrossRefADSGoogle Scholar
  13. Rahe, J., McCracken, C.W., Donn, B.D., 1976,’ Monochromaticand white-light observations of comet Bennett 1969I (1970 II)’, A&A Suppl. 23, 13.ADSGoogle Scholar
  14. Rauer, H., Arpigny, C., Manfroid, J., Cremonese, G., Lemme, C.: 1998,’ The spatial sodium distribution in the coma of comet Hale-Bopp (C/1995 O1)’, A&A 334, L61.ADSGoogle Scholar
  15. Spinrad, H., Miner, E.: 1968,’ Sodiumvelocity fields in comet 1965f’, AJ 153, 355.CrossRefADSGoogle Scholar
  16. Sprague, A., Kozlowski, R., Hunten, D., Wells, W., Grosse, F., 1992,’ The sodium and potassium atmosphere of the Moon and its interaction with the surface’, Icarus 96, 27.CrossRefADSGoogle Scholar
  17. Wilson, J.K., Mendillo, M., Baumgardner, J., 1998,’ Three tails of cometHale-Bopp’, Geophys. Res.Letter 25, 225.CrossRefADSGoogle Scholar

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© Kluwer Academic Publishers 1999

Authors and Affiliations

  • G. Cremonese

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