The infrared spectrum of the Be star γ Cassiopeiae ⋆

We present the 2.4 −45 μm ISO-SWS spectrum of the Be starγ Cas (B0.5 IVe). The spectrum is characterised by a thermal continuum which can be well fit by a powerlaw Sν ∝ ν0.99 over the entire SWS wavelength range. For an isothermal disc of ionized gas with constant opening angle, this correponds to a density gradient ρ(r) ∝ r−2.8. We report the detection of… CONTINUE READING