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Astron. Astrophys. 360, 1077-1085 (2000)

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2. Observations and reductions

High-resolution spectroscopy of CS 22873-139 in the red portion of the spectrum (5000-8000 Å) was carried out with the ESO Multi-Mode Instrument (EMMI) at the 3.5-m New Technology Telescope (NTT), and in the blue ([FORMULA] Å) with the CASPEC spectrograph at the 3.6m telescope at ESO, La Silla. The spectral resolving power, as measured from the FWHM of lines in the Th-Ar comparison spectra, is about [FORMULA] ([FORMULA]) for the EMMI spectra, and [FORMULA] for the CASPEC spectra ([FORMULA]). The FEROS instrument on the ESO 1.5m telescope was used to obtain lower [FORMULA] spectra in order to provide additional (independent) information for the velocity zero point of this star, as our initial inspection of the EMMI data suggested the presence of a possible offset with respect to the values provided by Preston (1994) (see below).

The observing log is given in Table 1. All the spectra have been reduced with a semi-automatic code developed for échelle spectra at Paris-Meudon Observatory (Spite 1990). The code locates the spectral orders by optimal extraction and performs flat fielding and wavelength calibration from the comparison lamp spectrum with a minimum of user intervention. The [FORMULA] ratios in Table 1 have been directly measured on the spectra. Preliminary results have been published (Nordström et al. 2000).


[TABLE]

Table 1. Log of the observations


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© European Southern Observatory (ESO) 2000

Online publication: August 23, 2000
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