Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...390.1075g&link_type=abstract
Astronomy and Astrophysics, v.390, p.1075-1087 (2002)
Astronomy and Astrophysics
Astrophysics
18
Stars: Circumstellar Matter, Ism: Dust, Extinction, Ism: Molecules, Ism: Lines And Bands, Infrared: Ism
Scientific paper
We report on a search for the NH3 inversion band at 9.0 mu m, the CH4 band at 7.7 mu m, and the CH3OH band at 9.7 mu m in the spectra of 10 heavily obscured stellar objects taken with the spectrophotometer ISOPHOT-S aboard the Infrared Space Observatory (ISO). Four of them show indications of the NH3 inversion band at 9.0 mu m superimposed on the always strong silicate band. The results show that ammonia ice may be abundant in some cool and dense molecular circumstellar regions. The 9.7 mu m band of solid CH3OH was detected in 5 of the sources, and also the 7.7 mu m band of solid CH4 was found in 5 sources. The PHT-S detections were cross-checked against ISO-SWS spectra from archive data. Considering the different beam sizes (24 x 24 sq arcsec versus 14 x 20 sq arcsec ), there is good agreement. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) with the participation of ISAS and NASA.
Ábrahám Peter
Gurtler Joachim
Henning Th
Klaas Ulrich
Lehmann Kevin K.
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