New Two-Variable Fits for the Scale Lengths of CN and its Parent Molecule in Cometary Atmospheres: Application to the Identification of the CN Parent

Details New Two-Variable Fits for the Scale Lengths of CN and its Parent Molecule in Cometary Atmospheres: Application to the Identification of the CN Parent New Two-Variable Fits for the Scale Lengths of CN and its Parent Molecule in Cometary Atmospheres: Application to the Identification of the CN Parent

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.4105b&link_type=abstract

American Astronomical Society, DPS Meeting #32, #41.05; Bulletin of the American Astronomical Society, Vol. 32, p.1072

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We provide new two-variable fits describing the variability of the Haser scale lengths of CN and its parent molecules. As in our previous reports on this subject we use the heliocentric distance and the 10.7-cm solar radio flux as independent variables. Such description reduces the error bars and avoids the systematic behavior observed in the residuals of the one-variable fits with only the heliocentric distance. The data for the CN parent scale length include 56 reported values from different comets over a period of two solar cycles. On that basis, using the connection between true and Haser scale lengths, we discuss the possible CN parents HCN and C2N2. These two molecules have been separately highlighted in different papers as the most probable candidates for a major CN parent. Our two-variable fit implies a brightness distribution of CN which may be explained under the assumption that the C2N2 molecule is the single CN parent.

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