The MACHO Project SMC Variable Star Inventory: I. The Second-overtone Mode of Cepheid Pulsation From First/Second Overtone (1H/2H) Beat Cepheids
The MACHO Collaboration · Alcock, C. · Allsman, R. A. · Alves, D. · Axelrod, T. S. · Becker, A. C. · Bennett, D. P. · Cook, K. H. · Freeman, K. C. · Griest, K. · Lehner, M. J. · Marshall, S. L. · Peterson, B. A. · Quinn, P. J. · Rodgers, A. W. · Rorabeck, A. · Sutherland, W. · Tomaney, A. · Vanderhei, T.
Original · EN
We report the discovery of 20 1H/2H and 7 F/1H beat Cepheids in the SMC by the MACHO Project. We utilize the 20 1H/2H stars to determine lightcurve shape for the SMC second-overtone (2H) mode of Cepheid pulsation. We predict, similar to the findings of Alcock et al. (1997, ApJ, submitted), that 2H Cepheids will have nearly or purely sinusoidal light variations; that the P-L relation for 2H Cepheids will not be distinguishable from the P-L relation for 1H Cepheids within photometric accuracy; and that 2H stars may be discernable from F and 1H stars using the amplitude-period diagram and Fourier parameter progressions for periods P < 0.7 days, our current sample 2H period limit.
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