MIDINFRARED SPECTRA OF COMETS P BORRELLY, P/FAYE, AND P/SCHAUMASSE/

Citation
Ms. Hanner et al., MIDINFRARED SPECTRA OF COMETS P BORRELLY, P/FAYE, AND P/SCHAUMASSE/, Icarus, 124(1), 1996, pp. 344-351
Citations number
20
Categorie Soggetti
Astronomy & Astrophysics
Journal title
IcarusACNP
ISSN journal
00191035
Volume
124
Issue
1
Year of publication
1996
Pages
344 - 351
Database
ISI
SICI code
0019-1035(1996)124:1<344:MSOCPB>2.0.ZU;2-W
Abstract
A 10 mu m silicate emission feature has been discovered in the spectra of comets P/Borrelly and P/Faye at R similar to 1.5 AU. These are the first short period comets in which silicate emission has definitely b een detected. The broad emission features are about 25% above the cont inuum. No emission feature was present in the spectrum of P/Schaumasse ; it is possible that the nucleus of P/Schaumasse was directly detecte d. If all of the observed flux originated from the nucleus, then the e ffective radius is about 3 km; the observed color temperature is consi stent with a rapidly rotating nucleus. We present models that show how the shape of the silicate feature can depend on the way in which sili cate and absorbing material are mixed in the grains. (C) 1996 Academic Press, Inc.