Ultralow-Amplitude Cepheids in the Large Magellanic Cloud

dc.contributor.authorBuchler, Benjamin
dc.contributor.authorWood, Peter R
dc.contributor.authorKeller, Stefan
dc.contributor.authorSoszynski, Igor
dc.date.accessioned2015-12-13T22:48:42Z
dc.date.issued2005
dc.date.updated2015-12-11T10:30:21Z
dc.description.abstractThe 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).
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/80205
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.titleUltralow-Amplitude Cepheids in the Large Magellanic Cloud
dc.typeJournal article
local.bibliographicCitation.lastpage154
local.bibliographicCitation.startpage151
local.contributor.affiliationBuchler, Benjamin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWood, Peter R, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKeller, Stefan, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSoszynski, Igor, Universidad de Concepcion
local.contributor.authoremailu9600798@anu.edu.au
local.contributor.authoruidBuchler, Benjamin, u9600798
local.contributor.authoruidWood, Peter R, u7900259
local.contributor.authoruidKeller, Stefan, u9702857
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub8500
local.identifier.citationvolume631
local.identifier.doi10.1086/497423
local.identifier.scopusID2-s2.0-27744499947
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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