Astronomy & Astrophysics

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Issue		A&A Volume 424, Number 3, September IV 2004
Page(s)		L35 - L38
Section		Letters
DOI		10.1051/0004-6361:200400050

A&A 424, L35-L38 (2004)
DOI: 10.1051/0004-6361:200400050

Letter

First result of June Boötid meteor spectrum

T. Kasuga^{1, 2}, J. Watanabe², N. Ebizuka³, T. Sugaya⁴ and Y. Sato⁵

¹ Department of Astronomical Science, School of Physical Science, The Graduate University for Advanced Studies (Sokendai), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
    e-mail: kasugats@cc.nao.ac.jp
² National Astronomical Observatory of the Japan (NAOJ), National Institute of Natural Science, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
    e-mail: jun.watanabe@nao.ac.jp
³ RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
    e-mail: ebizuka@riken.go.jp
⁴ Science Education, Graduate School of Education, Tokyo Gakugei University, 4-1-1 NukuiKita-machi, Koganei-city, Tokyo 184-8501, Japan
    e-mail: m031244f@u-gakugei.ac.jp
⁵ Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
    e-mail: yusuke@esa.c.u-tokyo.ac.jp

(Received 13 July 2004 / Accepted 1 August 2004 )

Abstract
This paper shows the first observational result of a spectrum of a June ${\rm Bo\ddot{o}tid}$ meteor obtained by the High-Definition TV observational system. The very faint spectrum appeared at $15^{\rm h} 59^{\rm m} 29.693^{\rm s}$ on 2004 June 23 UT, which was about 5th magnitude. Wavelengths between 360-620 nm were observed, and the strong emissions of neutral atoms as MgI, FeI and NaI were identified. Emissions of single ionized atoms were not observed. The abundances of metallic atoms, their excitation temperature were obtained under the Local Thermal Equilibrium (LTE) conditions. The results, $\rm Fe/Mg = 0.15$ and $\rm Na/Mg = 0.00027$ suggest the possibility that the abundances of June ${\rm Bo\ddot{o}tid}$ meteor are extremely different from the solar system abundances. The excitation temperature value, $3867 \pm 13$ K is low in agreement with their slow moving velocity.

Key words: June ${\rm Bo\ddot{o}tid}$ meteor spectrum -- dust stream resonance theory -- solar system abundance

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