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Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pim7.conf...42b&link_type=abstract
Proceedings of the International Meteor Conference, Bereges, France, 7-10 June, 2007 Edited by Rendtel, J.; Vaubaillon, J. Inter
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Scientific paper
I have analyzed 89 spectra of Geminid meteors obtained with image intensified video cameras in 1997-2004. Details of observation techniques and spectra analysis are given. Intensities of lines of Mg, Na, and Fe have been studied. Both Fe and Na lines were found to be fainter relatively to Mg than expected for chondritic composition. Moreover, the Na line intensity varied strongly from meteor to meteor. Based on the low Fe/Mg ratio, similar to other cometary meteoroids, I argue that 3200 Phaethon, the parent body of Geminids, is of cometary origin. Severe loss of Na occurred due to solar heating at the low perihelion distance of 0.14 AU. Varying meteoroid age seems to be the most plausible explanation of varying Na content from meteoroid to meteoroid, although other explanations, such as meteoroid origin in different depths in Phaethon or internal Phaethon inhomogeneities, are possible as well.
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