An analysis of spectrophotometric observations of comets Austin (1982g) and Bradfield (1980t) |
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| Authors: | P D Singh K Sinha B M Tripathi Heloisa M B Roberty |
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| Institution: | (1) Department of Astronomy, Institute of Astronomy and Geophysics, University of São Paulo, São Paulo, Brazil;(2) Uttar Pradesh State Observatory, Manora Peak, Nainital, U.P., India;(3) Observatorio de Valongo, Universidade Federal de Rio de Janeiro, Rio de Janeiro, RJ, Brazil |
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| Abstract: | Post-perihelion observed emission fluxes at 388 nm (CN) and 516 nm (C2) of the coma of comets Austin (1982g) and Bradfield (1980t) are analysed in the framework of the Haser model. Ratios of Haser model CN and C2 parent production rates with expansion velocity show that each comet behaves normally. For comet Austin (1982g), the Q
CN/v and Q
c2/v values decrease with increase of heliocentric distance of comet. For an assumed %; activity of the total spherical surface area of the nucleus, the water vaporization theory coupled with derived water production rates from the International Ultraviolet Explorer H and OH flux data yields a nuclear diameter of about 6 km for comet Austin (1982g). For comet Bradfield (1980t), the derived nuclear diameter is expected to be of about 1 km. In each comet, the dust mass production rates as well as ratio of dust-to-gas mass production rates decrease with increase of heliocentric distance of comet. |
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