O( S) and O( D) emission lines in the spectrum of 153P/2002 C1 (Ikeya-Zhang)

Free access article

Issue		A&A Volume 442, Number 3, November II 2005


Page(s)		1121 - 1126
Section		Planets and planetary systems
DOI		http://dx.doi.org/10.1051/0004-6361:20053047

A&A 442, 1121-1126 (2005)
DOI: 10.1051/0004-6361:20053047

O( $^{\mathsf 1}$ S) and O( $^{\mathsf 1}$ D) emission lines in the spectrum of 153P/2002 C1 (Ikeya-Zhang)

M. T. Capria¹, G. Cremonese², A. Bhardwaj³ and M. C. De Sanctis¹

¹ INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF), Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere 100, 00133 Roma, Italy
e-mail: mariateresa.capria@rm.iasf.cnr.it
² INAF - Padua Observatory, vicolo dell'Osservatorio, Padua, Italy
³ Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivarundrum 695022, India

(Received 13 March 2005 / Accepted 10 June 2005 )

Abstract
High resolution spectroscopy observation of comet 153P/2002 C1 Ikeya-Zhang was performed on April 20, 2002 with the echelle spectrograph SARG on the 3.5 m Telescopio Nazionale Galileo in La Palma. The atomic O emission lines at 5577, 6360 and 6363 Å are clearly visible in the spectrum. We determined the intensity ratio of the green line to the sum of the red lines. In order to verify the hypothesis that water is the main parent species of these emissions, the result was compared with the value obtained from a coupled chemistry-transport model. The measured value for the green to red ratio, $0.12 \pm 0.1$ , agrees quite well with the value obtained from the model. This led us to conclude that during the observation water was the parent species of atomic O lines.

Key words: comets: individual: 153P/2002 C1 Ikeya-Zhang -- comets: general

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