2. Material

All the material was obtained on CCD receivers at the 193 cm telescope at the Haute Provence Observatory (OHP). The spectrograph used was CARELEC (Lemaitre et al. 1990) The observational data are collected in Table 1 (click here).

 

Date Wavelength Code

4 - 04 - 93 3736 - 4197 z

25 - 10 - 91 3896 - 4322 a

25 - 10 - 91 4285 - 4715 b

25 - 10 - 91 4698 - 5120 c

06 - 04 - 93 7000 - 7412 d

24 - 10 - 91 6973 - 7383 e

07 - 01 - 90 7570 - 7980 x

31 - 03 - 93 8358 - 8790 f

21 - 02 - 92 8365 - 8775 g

27 - 12 - 90 8360 - 8770 h

30 - 12 - 90 8305 - 8720

15 - 11- 89 8375 - 8790 i

27 - 12 - 90 9010 - 9420 j

03 - 01 - 90 9840 - 10220 k

Date: day - month - year (-1900).
Wavelength region indicated in Angstroem.
Code- internal code used in Table 2.  

For a grating with 1200 lines/mm, blazed at 4000 Å was used, providing a dispersion of 33 Å/mm in the first order. For a 1200 lines/mm grating was used, with a blaze at 7500 which provides in the first order a dispersion of 33 Å/mm; filter OG 590 was used to cut out the second order.

From 1990 to 1993 the receiver was a Thomson CCD with pixels, (23 square microns), providing a resolving power of about 1 Å. After 1993 the receiver used was a TK 512 CCD, with pixels (27 square microns). The resolving power was about 1.2 Å.

For the wavelength calibration we used Ne, Ar and He lamps. Flat field corrections were made with a Tungsten lamp mounted in the spectrograph. The slit width used was 300 microns, corresponding to 2'' on the sky. The data were reduced with the software package IHAP, developed at ESO and installed at the OHP.

As remarked above, the resolving power is of about one Angstroem, which is not very well suited for radial velocity studies. The smallest equivalent width which can be measured is of the order of 0.15 Å. Since we are working with material obtained under the same conditions as those for HD 51585 (Jaschek et al. 1996 = Paper I) we adopt the errors given in that paper which are of the order of 10%. Furthermore, the resolution prevents us also from resolving structures in the line profiles (double lines for instance) whose separation is less than 75 km/s in the blue and 40 km/s in the red.