Mid-Infrared Spectro-Imaging Observations Of Comet Hale-Bopp |
| |
| Authors: | Galdemard P Lagage P O Dubreuil D Jouan R Masse P Pantin E Bockelée-Morvan D |
| |
| Institution: | (1) D.S.M./D.A.P.N.I.A./Service d'Astrophysique, CEA/Saclay, bat. 709, F-91191 Gif-sur-Yvette Céedex, France;(2) Instituut voor Sterrenkunde, K.U. Leuven, and also;(3) C.E.A./D.S.M./D.A.P.N.I.A./Service d'Astrophysique, Belgium;(4) Observatoire de Meudon, 5, Place Jules Janssen, F92190 Meudon, France |
| |
| Abstract: | Comet C/1995 O1 (Hale-Bopp) was observed with camiras, the Saclay mid-infrared camera, mounted on the Nordic Optical Telescope
(Roque de los Muchachos, La Palma), from April 14th to April 25th, 1997. This observing run was part of the European campaign
devoted to Hale-Bopp observations from the Canary Islands (PI R. West). camiras spectro-imaging capabilities, achieved with
a Circular Variable Filter (of spectral resolution R ≈ 50), were used to obtain spectra of the comet in the N atmospheric
window (8–13 μm) over a large field of view (52″ × 78″), at a spatial resolution of ∼1 arcsec. Data were also collected at
shorter wavelengths (in the L and M bands). The silicate dust feature around 10 μm is clearly apparent in the data. The shape
of the feature varies continuously according to the position in the field. A dust model developed at Saclay in the framework
of β-Pictoris dust disk studies was used to interpret the observations. The presence of both olivine and pyroxene with a high
degree of crystallinity is needed to account for the observations. A change in the size distribution of the grains allows
to reproduce the spatial change of the silicate feature according to the position in the field.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
| Keywords: | Comet Hale-Bopp mid-infrared comet spectra silicates |
| 本文献已被 SpringerLink 等数据库收录！ |
|
