we propose to determine the ir spectra of reflection nebulae as a function of effective temperature of the central star. the goal is to study the energy budget of the dust and is complementary to an accompagning study of the energy budget of the gas (mspaans_coolpdrs). in this way we can determine spectral variations in the mid ir emission features as a function of pumping photon energy. we can also test models for the photoelectric heating of of interstellar gas by pahs and small grains. finally, these observations will provide an independent measurement of the dust opacity.
Instrument
CAM01 , CAM04 , SWS01
Temporal Coverage
1996-02-08T17:40:47Z/1997-01-19T01:20:04Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
