Publication: Orbits and emission spectra from the 2014 Camelopardalids
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2014-12-11
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We have analysed the meteor activity associated with meteoroids of fresh dust trails of Comet 209P/LINEAR, which produced an outburst of the Camelopardalid meteor shower (IAU code #451, CAM) in 2014 May. With this aim, we have employed an array of high-sensitivity CCD video devices and spectrographs deployed at 10 meteor observing stations in Spain in the framework of the Spanish Meteor Network. Additional meteoroid flux data were obtained by means of two forward-scatter radio systems. The observed peak zenithal hourly rate was much lower than expected, of around 20 meteors h(-1). Despite of the small meteor flux in the optical range, we have obtained precise atmospheric trajectory, radiant and orbital information for 11 meteor and fireball events associated with this stream. The ablation behaviour and low tensile strength calculated for these particles reveal that Camelopardalid meteoroids are very fragile, mostly pristine aggregates with strength similar to that of the Orionids and the Leonids. The mineral grains seem to be glued together by a volatile phase. We also present and discuss two unique emission spectra produced by two Camelopardalid bright meteors. These suggest a non-chondritic nature for these particles, which exhibit Fe depletion in their composition.
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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2014 The Autors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Meteor stations deployed at Sevilla, La Hita, Huelva, El Arenosillo, Sierra Nevada and La Pedriza have been funded by the first author. We acknowledge partial support from the Spanish Ministry of Science and Innovation (projects AYA2011-26522, AYA2012-31277 and AYA2012-30717). We thank the AstroHita Foundation for its continuous support in the operation of the meteor observing station located at La Hita Astronomical Observatory.
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