2. Observations and data reduction
For both objects we observed small spectral ranges covering the positions of the OH lines at 34 µ, 53 115 µ, and 119 µ (rest frame wavelengths). With the LWS we took on-source and off-source spectra. The observational parameters are given in Table 1. The spectrum of IRAS 20100-4156 observed on Nov. 9th, 1996 seemed to show some emission roughly at the position of the 115 µ line, but the observational data were not conclusive. We therefore took in March 1998 an additional spectrum covering only the region of the 115 µ line. - For 3 Zw 35 we took in addition a low resolution spectrum covering the whole LWS range, in order to determine possible fringes.
The date were processed using the ISO spectral analysis package (ISAP).
© European Southern Observatory (ESO) 1999
Online publication: November 3, 1999