The following document lists the file abstract/BBEZARD_GL229B.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
===================================================================== We propose to record the first spectrum of a brown dwarf (Gliese 229B) longward of 5 microns (4.9-12.2 microns), using the ISOCAM instrument with the CVF. Gliese 229B, a weak companion to the nearby M1 V star Gl229A, is the only unambiguous brown dwarf discovered to date. Its spectrum has been explored only in the 1- to 2.5-micron range, revealing spectral signatures from methane and water vapour. In the observations proposed here, we expect to detect strong absorption features from these two compounds between 5.2 and 8.2 microns and to make the first detection of ammonia from its nu_2 band at 10.5 microns. These observations will provide unique information on the thermal structure of Gliese 229B, on its elemental C and O abundances, and ultimately on its age, mass, and evolution. This is a new proposal since the discovery of Gliese 229B occured after the initial call for ISO proposals.