ice bands due to water, co2, and hexane, and probabl absorption by co and ch3oh have been discovered in the vicinity of the massive b supergiant and radio shell source g79.29+0.46. these were discovered during calibration time, previously unexpected, and may be formed in a compact nebula or equatorial outflow evidenced in recent ground-based and isocam observations. the central source of g79.29+0.46 is one of only 10 galactic stellar sources known or suspected to be a luminous blue variable, is highly reddened, and is surrounded by a ring nebula. as such, it is a rare source for exploring the physical chemistry of an ice-forming region to be contrasted with embedded ysos and interstellar molecular clouds observed with iso. the chemistry that probably include gas-phase molecules and crystalline silicates could provide key evidience for the mass-loss history of g79.29+0.46 and the b-lbv-rsg filiation that is a matter of serious debate between observations and theory. we ask for 12000 seconds of discretionary observing time to scan the central source and one position off-source with sws at maximum grating resolution (sws06). in a complementary proposal we ask discretionary observing time to map the h2o 3.07 micron ice with isocam using circular variable filters.
Instrument
SWS06
Temporal Coverage
1997-12-22T22:07:57Z/1997-12-23T00:17:39Z
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.
