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Observing Run: 1994

 

The 1994 observing run was carried out at UKIRT between 2-5 October Universal Time (UT). CGS4 was used with the echelle grating, long camera and with the detector array. Spectra were obtained for a sample of T Tauri stars at Br Gamma (2.166 ) and for a sub-sample of these stars at Pa Beta (1.282 ). The slit size was 1''.25 x 90'' and the pixel size 1''.25 in the dispersion direction and 2''.2 in the spatial direction for the Br Gamma and Pa Beta setups. The spectra were sampled twice per resolution element (R=16000). The spectral coverage is 1400 km/s at Br Gamma and 1200 km/s at Pa Beta. The observing log for the two lines is shown in Tables 2.2 and 2.3. The log for the standard stars is in Table 2.4.


Table 2.2: UT9410 Br Gamma observing log. For each star is listed - UT date and time at which the observation started, integration time per spectral point, airmass of the object, Bright Star Catalogue number of the standard and airmass of the standard. De-rippled spectra are marked with *.

 


Table 2.3: Same as table 2.2 for Pa Beta.

 


Table 2.4:UT9410 standard stars observing log. For each star is listed - UT date and time at which the observation started, integration time per spectral point, airmass of the object and wavelength region observed.

 

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 2.4).

GI Tau and GK Tau are close enough (12''.4) that their spectra could be recorded simultaneously by orienting the slit along the position angle 29o.

The observing conditions were generally good throughout this run. The seeing was always not very good at the beginning of the night but it improved as the night went on, having reached about 0. roughly three hours after sunset on UT941003. The sky was always clear with the exception of a few high clouds passing by in the first half of the UT941005 night.



Daniel Folha
Fri Aug 28 11:53:21 BST 1998