New variable and multiple stars in the lower part of the Cepheid instability strip
Lampens, P.; Fremat, Y.; van Cauteren, P.; Robertson, C. W.
Belgium, United States
Abstract
We obtained high-resolution spectra for 33 A-type stars during 4 consecutive nights. All our targets are Hipparcos program stars located in the lower part of the Cepheid instability strip which show hints for variability in radial velocity of a yet unidentified nature. CCD photometry was acquired for some of the most promising candidates and used to further interpret the variability of several targets. A first result is the discovery of two new pulsating variable stars. In addition, five new binary or multiple systems were identified (one SB1, three SB2 and one SB2 triple system).