Strange and Low Amplitude Cepheid Candidates in the CoRoT Observations

We present the preliminary results of our search for low amplitude single mode pulsations in objects located near the edges of the classical Cepheid Instability Strip (IS). Cepheids entering or leaving the IS are expected to show low amplitude pulsation, while stars outside the IS may pulsate in a high-overtone radial mode that is trapped in the stellar atmosphere. Such stars have been recently discovered in the LMC [1], [2], [5]. We have found 37 low amplitude and strange Cepheid candidates in the CoRoT IRa0l and LRa0l fields. The selection was based on the expected period range and location on the HRD. According to our numerical simulations, strange modes can be identified on the color - period diagram.