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Session 96 - Cepheids and Supergiant Variable Stars.
Display session, Thursday, January 16
Metropolitan Ballroom,

[96.13] Searching for singly-periodic 2H Cepheids in the LMC

A. J. Rorabeck (McMaster), C. Alcock (LLNL/CfPA), R. A. Allsman (MSO/ANU), D. R. Alves (LLNL/CfPA), T. S. Axelrod (MSO/ANU), A. Becker (Washington), D. P. Bennett, K. H. Cook (LLNL/CfPA), K. C. Freeman (MSO/ANU), K. Griest, J. A. Guern, M. J. Lehner (UCSD), S. L. Marshall, D. Minniti (LLNL/CfPA), B. A. Peterson (MSO/ANU), M. R. Pratt (Washington), P. J. Quinn (ESO), A. W. Rodgers (MSO/ANU), C. W. Stubbs (Washington), W. Sutherland (Oxford), D. L. Welch (McMaster)

We recently performed a Fourier decomposition of LMC 1H/2H beat Cepheids from the MACHO Project database. We found (i) a correlation between lightcurve shape and mode of pulsation, and (ii) Fourier parameters for the 2H mode are distinct from the 1H and F modes of pulsation over our sample period range (0.4 to 1.1 days). These results suggested singly-periodic 2H Cepheids, if they existed, would have periods less than 1.2 days, making them fainter than V=17.1 and Cousins R=16.9. The above period and magnitude constraints provide guidance on the region of luminosity and period in which we might expect singly-periodic 2H mode Cepheids to be found. In this paper we will report on the status of our search for these stars.

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