Poster abstract details

While testing a Strömgren spectrophotometer attached to the 1.5-m telescope at the San Pedro Mártir observatory, Mexico, a number of A-type stars were observed, one of which, HD 207331, presented clear indications of photometric variability. CCD photometric data acquired soon after, confirmed its variability. uvby differential photoelectric photometry was carried out for three nights in 2008 November.
As a result of the period analysis of the light curves we have found a dominant pulsation mode at 21.1 cd^{-1} with an amplitude of 6 mmag. In order to determine its pulsation behaviour more accurately, follow up CCD observations were carried out from 2009 August 26 to 2009 September 1 from two observatories distributed in longitude: Observatorio del Teide (0.80-m telescope IAC80) and Observatorio San Pedro Mártir (0.84-m telescope). A summary of these observations, which suggest that HD 207331 is a new multi-periodic Delta Scuti-type pulsating star, will be given in the present contribution.