Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jbaa..109..179a&link_type=abstract
Journal of the British Astronomical Association, vol.109, no.4, p.179-188
Astronomy and Astrophysics
Astronomy
3
Meteor Spectra
Scientific paper
During a Winston Churchill research fellowship visit to Tenerife, the author was fortunate to capture a polychromatic image and two spectra of a flaring, magnitude -4, Perseid meteor. One spectrum, obtained using an unusual reflection grating spectrograph design, captured meteor emission lines in the wavelength range 3920 to 4720 Å at an average dispersion at the camera film plane of 16 Å/mm. Using a solar spectrum comparison technique for the analysis, 31 strong emission lines due to CaII, CaI, MgII, MgI and FeI have been positively identified. Analysis of an additional 54 weaker lines provides some evidence for the presence of CrII, CrI and FeII. The strength of the ion lines relative to the neutral lines indicates a high atmospheric entrance velocity for the meteor. Combination of a large dispersion and long focal length in the high resolution spectrograph enabled clear monochromatic images of the meteor flare to be obtained. Detailed differences between the meteor appearance in CaII and MgII light are revealed and discussed.
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