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We concentrate on an asteroseismological study of HD 261711, a rather hotdelta Scuti type pulsating member of the young open cluster NGC 2264 located atthe blue border of the instability region. HD 261711 was discovered to be apre-main sequence delta Scuti star using the time series photometry obtained bythe MOST satellite in 2006. High-precision, time-series photometry of HD 261711was obtained by the MOST and CoRoT satellites in 4 separate new observing runsthat are put into context with the star's fundamental atmospheric parametersobtained from spectroscopy. With the new MOST data set from 2011/12 and the twoCoRoT light curves from 2008 and 2011/12, the delta Scuti variability wasconfirmed and regular groups of frequencies were discovered. The two pulsationfrequencies identified in the data from the first MOST observing run in 2006are confirmed and 23 new delta Scuti-type frequencies were discovered using theCoRoT data. Weighted average frequencies for each group are related to l=0 andl=1 p-modes. Evidence for amplitude modulation of the frequencies in two groupsis seen. The effective temperature was derived to be 8600$\pm$200 K, log g is4.1$\pm$0.2, and the projected rotational velocity is 53$\pm$1km/s. Using ourTeff value and the radius of 1.8$\pm$0.5 Rsun derived from SED fitting, we geta log L/Lsun of 1.20$\pm$0.14 which agrees well to the seismologicallydetermined values of 1.65 Rsun and, hence, a log L/Lsun of 1.13. The radialvelocity of 14$\pm$2 km/s we derived for HD 261711, confirms the star'smembership to NGC 2264. Our asteroseismic models suggest that HD 261711 is adelta Scuti-type star close to the zero-age main sequence (ZAMS) with a mass of1.8 to 1.9Msun. HD 261711 is either a young ZAMS star or a late PMS star justbefore the onset of hydrogen-core burning.

Regular frequency patterns in the young delta Scuti star HD 261711 observed by the CoRoT and MOST satellites