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

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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]

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.
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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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