ISO-LWS observations of Herbig Ae/Be stars

Lorenzetti, D.; Giannini, T.; Nisini, B.; Molinari, S.; Saraceno, P.; Spinoglio, L.; Tommasi, E.; Pezzuto, S.; Strafella, F.; Clegg, P. E.; White, G. J.; Barlow, M.; Cohen, M.; Liseau, R.; Palla, F. and Smith, H. A. (1998). ISO-LWS observations of Herbig Ae/Be stars. In: Star Formation with the Infrared Space Observatory, 24-26 Jun 1997, Lisbon, Portugal.



We present the first results of a survey of Herbig Ae/Be stars (HAEBE) obtained with the Long Wavelength Spectrometer (LWS) on board of ISO. The [OI] and [CII] fine structure lines are the strongest features observed in the 45 - 198 μm range and their intensity ratios are fully compatible with those expected from a photodissociation region. Molecular emission in form of high-J CO rotational transitions is associated with the objects having high density environments and C-shocks mechanism is likely responsible for that. The observed far IR continua have been consistently fitted along with the overall spectral energy distributions (from UV to radio wavelengths). The adopted model computes the continuum emission from star, circumstellar gas and dust arranged in a spherical geometry. A good agreement with the observations is found by adopting dust grains typical of circumstellar environments with an absorption coefficient at FIR wavelengths which follows a dependence shallower than that of standard mixtures.

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