Icy grains as source of water and oxhydryl in comet atmospheres

Details Icy grains as source of water and oxhydryl in comet atmospheres Icy grains as source of water and oxhydryl in comet atmospheres

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe...8s&link_type=abstract

"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199

Astronomy and Astrophysics

Astronomy

Scientific paper

A swarm of icy grains released in an eruption can affect the water and OH production and their time evolution. The fragility and properties of a comet nucleus made of amorphous ice, allow us expect a broad and abundant icy grains distribution in the comae of close and active comets. Hence, we have developed a model for water and OH production in cometary outbursts, with the inclusion of a distribution of icy grains. With a initial mass of 1011grams the water and OH productions are increased in a factor two, and the growth trend are very affected by the presence of the ices. The model is applied to radio observations of OH in comet Halley, and fit well with the data. This model can be tested with high resolution observations of water in some cometary coma in the future. Others effects related with the de-excitation of OH trhough collisions in plasma regions of the coma of Halley, that we found in the radio-data are also disscused.

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