Dk. Aitken et al., MIDINFRARED SPECTROSCOPY OF BETA-PICTORIS - CONSTRAINTS ON THE DUST GRAIN-SIZE, Monthly Notices of the Royal Astronomical Society, 265(4), 1993, pp. 41-43
We present 8-13 mu m spectroscopy of Beta Pictoris which confirms the
presence of silicate emission in its infrared excess, as earlier repor
ted on the basis of narrow-band photometry, and indicates a similarity
with cometary dust. The spectral form of the infrared excess allows u
s to place an upper limit of 2-3 mu m on the size of the emitting grai
ns in the circumstellar disc.