... component

Based on observations collected at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy, and at the European Southern Observatory, La Silla, Chile.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...

Tables A2-A4 are only available in electronic form at http://www.edpsciences.org

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... library

URL: http://www.obs-hp.fr/www/archive/archive.html

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... HYPERCAT

URL: http://www-obs.univ-lyon1.fr/hypercat/

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

Article Contents

	1 Introduction
	2 The sample
	3 Spectroscopic observations
	4 Observational results
	5 Data analysis and discussion
	6 Conclusions
	Appendix A: Parameters of the sample and results
	References
	Online Material

	List of tables
	List of figures