we wish to determine the neon/helium abundance ratio in wolf-rayet winds by measuring in sws aot band-3a (12.0 - 16.5 micron) with aot sws06 the flux of the neii 12.184 micron and neiii 15.55 micron and the neighbouring heii emission lines in wr stars with galactocentric distances ranging from 6 kpc to 10 kpc from the sun. we wish simulataneous spectrophotometric observations in sws aot band-1a (2.38 - 2.60) where emission lines of civ, heii and he i occur. the width of those spectral lines will be a measure of the wr steller wind velocities, since the neiii lines are formed where the winds have reached their terminal velocities. the abundance and velocities together will allow the determination of mass loss rates. the neon abundance determinations are a crucial check of stellar evolution models for massive stars, which predict a much larger than solar neon abundance.
Instrument
SWS06
Temporal Coverage
1996-09-01T04:33:46Z/1997-03-07T22:53:51Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds 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.
European Space Agency, van der Hucht et al., 1999, 'NEON ABUNDANCE IN WOLF-RAYET STELLAR WINDS', 1.0, European Space Agency, https://doi.org/10.5270/esa-2zwfzet
