Abstract
The STEPHI (STEllar PHotometry International) network was set up to obtain long runs of high quality photometry data of a representative set of δ Scuti type variables.Three sites are involved: Observatorio del teide (hereafter OT), Tenerife, Canary Islands, Spain;Xinglong Station (hereafter XL), Hebei Province, China; Observatorio Astronomico Nacional de San Pedro Martir (hereafter SPM), Baja California Norte, Mexico. The interval of 120°in longitude between the 3 sites allows uninterrupted observations and it improves greatly the spectral window of the frequency analysis. The instrumentation is characterized by two main, choices: the four-channel photometers and the 1.5 to 2 m telescopes. The Chevreton
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