Issue |
A&A
Volume 490, Number 3, November II 2008
|
|
---|---|---|
Page(s) | L31 - L34 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200810833 | |
Published online | 03 October 2008 |
Letter to the Editor
The
OH/
OH and OD/OH isotope ratios in comet C/2002 T7
(LINEAR)*
1
Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, 4000 Liège, Belgique e-mail: hutsemekers@astro.ulg.ac.be
2
Observatoire de Besançon, 25010 Besançon Cedex, France
Received:
19
August
2008
Accepted:
23
September
2008
The 16OH/18OH and OD/OH isotope ratios are measured in the
Oort-Cloud comet C/2002 T7 (LINEAR) through ground-based observations
of the OH ultraviolet bands at
3063 Å (0, 0) and 3121 Å (1, 1) obtained with the Very Large
Telescope (VLT) feeding the Ultraviolet-Visual Echelle Spectrograph
(UVES). From the 16OH/18OH ratio, we find 16O/18O =
, equal
within the uncertainties to the terrestrial value and to the ratio
measured in other comets, although marginally smaller. We also
estimate OD/OH from which we derive
in water. This value is compatible with the water D/H ratios evaluated in
other comets and is marginally higher than the terrestrial value.
Key words: comets: general / comets: individual: C/2002 T7 (LINEAR)
© ESO, 2008
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