The MACHO Project SMC Variable Star Inventory: I. The Second-overtone Mode of Cepheid Pulsation From First/Second Overtone (1H/2H) Beat Cepheids
Abstract
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.
Cite
@article{arxiv.astro-ph/9709025,
title = {The MACHO Project SMC Variable Star Inventory: I. The Second-overtone Mode of Cepheid Pulsation From First/Second Overtone (1H/2H) Beat Cepheids},
author = {The MACHO Collaboration and C. Alcock and R. A. Allsman and D. Alves and T. S. Axelrod and A. C. Becker and D. P. Bennett and K. H. Cook and K. C. Freeman and K. Griest and M. J. Lehner and S. L. Marshall and B. A. Peterson and P. J. Quinn and A. W. Rodgers and A. Rorabeck and W. Sutherland and A. Tomaney and T. Vanderhei},
journal= {arXiv preprint arXiv:astro-ph/9709025},
year = {2007}
}
Comments
15 pages, 4 Encapsulated PostScript figures. Submitted to the Astronomical Journal