Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 318, 805-811 (1997)

Previous Section Next Section Title Page Table of Contents

2. Spectroscopic observations

All the programme stars, except P75, were observed at the 2.5m Isaac Newton telescope (INT) with the Intermediate Dispersion Spectrograph (IDS) during a four night run in August 1995. We used the 235mm camera, AgRed collimator, gratings R1200Y and H1800V and a TEK 1124x1124 CCD detector. For each star we give in Table 1 the Prosser (1993) number and V-magnitude, date of the observation, dispersion (resolution [FORMULA] 2 pixels), and exposure time. One of the stars was observed with the 3.5m telescope at Calar Alto observatory, using the TWIN spectrograph, T06 grating in the red arm and a TEK chip.


Table 1. Observing log

Each spectrum was reduced by a standard procedure using IRAF 1, which included debias, flat field, optimal extraction and wavelength calibration using CuNe arc lamps. Fig. 1 displays the full range of the final spectra.

[FIGURE] Fig. 1. Spectra of 14 late-type stars in the open cluster IC 4665. The positions of H [FORMULA]   and Li I [FORMULA] 6708  are marked.
Previous Section Next Section Title Page Table of Contents

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998