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Astron. Astrophys. 319, 617-629 (1997)

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H2O+, CO+, and dust in Comet P/Swift-Tuttle *

K. Jockers 1 and T. Bonev 2

1 Max-Planck-Institut für Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Germany
2 Institute of Astronomy, Bulgarian Academy of Sciences, Tsarigradsko chaussée 72, 1784 Sofia, Bulgaria

Received 22 March 1996 / Accepted 9 August 1996


Comet P/Swift-Tuttle was observed in the light of H2 O [FORMULA], CO [FORMULA] and continuum with the 2-m telescope of the Bulgarian National Astronomical Observatory (BNAO) on Nov. 25, 1992. We present column density maps of the H2 O [FORMULA] and CO [FORMULA] ions and a map of the product of filling factor, geometrical albedo, and phase function. The H2 O [FORMULA] ions are more concentrated toward the nucleus than CO [FORMULA]. The ion distributions are in close agreement with magnetohydrodynamic models including photochemistry of H2 O [FORMULA], CO [FORMULA] and their parents. The color of a spiral dust jet present in the continuum image was redder than the color of the ambient dust. The observations demonstrate the similarity between comets P/Halley and P/Swift-Tuttle.

Key words: comets: general; P/Halley; 109P/Swift-Tuttle

* Based on observations at the Bulgarian National Astronomical Observatory

Send offprint requests to: K. Jockers

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998