Ultralow-amplitude cepheids in the large magellanic cloud

J. Robert Buchler*, Peter R. Wood, Stefan Keller, Igor Soszyński

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    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 objects are Cepheids undergoing pulsations in a surface mode and that they belong to a novel class of Strange Cepheids (or surface mode Cepheids) whose existence was predicted by Buchler et al. (1997).

    Original languageEnglish
    Pages (from-to)L151-L154
    JournalAstrophysical Journal
    Issue number2 II
    Publication statusPublished - 1 Oct 2005


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