Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..369p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 369-374.
Astronomy and Astrophysics
Astrophysics
6
Comet Tails, Cometary Atmospheres, Cosmic Dust, Photosphere, Solar Spectra, Transition Probabilities, Astronomical Models, Computerized Simulation, Hydrodynamics, Stellar Luminosity
Scientific paper
An analysis is made of two anomalous structures observed in the dust tail images of C/1910I obtained by Lampland (1912), namely a strong streamer and a short, wide and real antitail. The favorable perspective of these observations makes it possible to exclude the possibility that the streamer is an ion ray or the result of a synchronic pile-up phenomenon, whereas the Neck-Line Structure (NLS) model (Pansecchi et al. 1987) explains these features. Numerical simulations show that the residual differences between the observations and the predictions of the NLS model are due to the very high earth latitude on the comet orbital plane. Under these conditions, the luminosity scattered by the NLS is also strongly influenced by the collapsing dust. Moreover it is shown that the length of the real antitail offers a simple constraint upon hydrodynamic models of the dust-gas interactions.
Fulle Marco
Pansecchi Luigi
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