Long-slit spectra covering the range were obtained at the 2.5 m Isaac Newton Telescope on La Palma (Observatorio del Roque de los Muchachos, Canary Islands, Spain), equipped with the IDS spectrograph and a CCD detector. The full spectral range was covered with a spectral resolution of 4 Å using a grating of 632 lines mm-1 at three angles, and slit widths of (1993 December) and (1994 July). The observed objects, the positions and orientations (PA) of the slit, and the exposure times corresponding to the observed spectral ranges are listed in Table 1.
Table 1. Journal of observations
Bias frames, twilight and tungsten flat-field exposures, wavelength calibrations and exposures of standard stars (from the IRAF compilation) were taken each night. Sky spectra were obtained near each object after or before each set of nebular exposures.
© European Southern Observatory (ESO) 1999
Online publication: November 16, 1999