The 1995 observing run was carried out at UKIRT between 15-17 December
Universal Time (UT). CGS4 was used with the echelle grating, short camera
and with the 256x256 detector array. Spectra were obtained for a sample of
T Tauri stars, Herbig Ae/Be stars and FU Orionis stars at Pa Beta
(1.282 
) and for a slightly
different sample of these stars at Br Gamma (2.166
). The slit size was
1''.2 x 90'' and the pixel size 1''.2 in the dispersion
direction and 1''.8 and 1''.7 in the spatial
direction, respectively for Pa Beta and Br Gamma. The spectra were
sampled twice per resolution element (R=20500). The spectral coverage is
3800 km/s at Br Gamma and 3600 km/s at Pa Beta. Since the work
presented here deals only with the T Tauri stars, the
observing logs presented in Tables 2.5 to 2.7 are those of the T Tauri stars only.
For flat fielding and wavelength calibration, flat field frames and frames of Argon and Krypton arc lamps were obtained. A number of standard stars from the Bright Star Catalogue [Hoffleit 1982] were also observed (see Table 2.8).
The slit position was E-W, i.e. oriented along the position angle -90o, at all times. XZ Tau and HL Tau are close enough ( 23'') that their spectra could be recorded simultaneously.
Table 2.6: UT19951215 Pa Beta observing log.
Table 2.7: UT19951216 Pa Beta observing log.
Table 2.8: UT9512 standard stars observing log. For each
star (T Tauri stars and template stars) is listed - UT date and time at
which the integration started, integration time per spectral point,
airmass of the object and wavelength region observed. De-rippled spectra
are marked with *.
Clear skies were present throughout the three days of this observing run, therefore clouds were never a problem. The seeing was not very good though, with typical values ranging from 1. to 2.''.0. Spells of high humidity (as high as 90%) occured during the nights corresponding to UT951216 and UT951217 but not for long periods. On UT951216 the dome had to be closed due to fog but only about half an hour before the end of the night. Overall the observing conditions were quite good.
