Back to the Abstract

	1 Introduction
	2 Cepheids observed and selected spectral lines.
	3 Hydrodynamical models
	4 New insights into understanding the projection factor
	5 Direct measurement of velocity gradients from HARPS observations
	6 A period-projection factor relation
	7 Discussion
	8 Conclusion
	References
	Online Material

	List of tables
	List of figures