Ultralow-Amplitude Cepheids in the Large Magellanic Cloud

Buchler, Benjamin
Wood, Peter R
Keller, Stefan
Soszynski, Igor

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Publication date

December 2015

DOI

10.1086/497423

Publisher

University of Chicago Press

Journal

The Astrophysical Journal

Abstract

The MACHO variables of LMC field 77 that lie in the vicinity of the Cepheid instability strip are reexamined. Among the 144 variables that we identify as Cepheids, we find 14 that have Fourier amplitudes <0.05 mag in the MACHO red band, of which seven have an amplitude <0.006 mag: we dub the latter group of stars ultralow-amplitude (ULA) Cepheids. The variability of these objects is verified by a comparison of the MACHO red with the MACHO blue light curves and with those of the corresponding OGLE LMC stars. The occurrence of ULA Cepheids is in agreement with theory. We have also discovered two low-amplitude variables whose periods are about a factor of 5-6 smaller than those of F Cepheids of equal apparent magnitude. We suggest that these o...