... OHP

These observations have been funded by the Optical Infrared Coordination network (OPTICON), a major international collaboration supported by the Research Infrastructures Programme of the European Commission Sixth Framework Programme.

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... WHT

The William Herschel Telescope (WHT) is operated by the Isaac Newton Group and the IAC in Spain's Roque de los Muchachos Observatory.

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... IRAF

IRAF is the Image Reduction and Analysis Facility, written and supported by the IRAF programming group at the national Optical Astronomy Observatories (NOAO) in Tucson, Arizona.

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... work

Preliminary estimates of the redshift for this and some other objects analyzed in this paper were presented in advance in Gutiérrez & López-Corredoira (2006) and López-Corredoira & Gutiérrez (2006).

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