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The MACHO Project Large Magellanic Cloud Variable Star Inventory XII. Three Cepheid Variables in Eclipsing Binaries

Alcock, Charles; Allsman, Robyn; Alves, David R; Becker, Andrew C; Bennett, D P; Cook, Kem H; Drake, Andrew John; Freeman, Kenneth; Griest, K; Hawley, Suzanne; Keller, S C; Lehner, M J; Lepischak, D; Marshall, S L; Minniti, D; Nelson, C A; Peterson, Bruce; Popowski, P; Pratt, M; Quinn, Peter J; Rodgers, Alexander; Suntzeff, Nicholas B; Sutherland, William J; Vandehei, T; Welch, D L

Description

We present a method for solving the light curve of an eclipsing binary system that contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the Large Magellanic Cloud (LMC). A geometric model is constructed in which the component stars are assumed to be spherical and on circular orbits. The emergent system flux is computed as a function of time, with the intrinsic variations in temperature and radius of the Cepheid treated self-consistently....[Show more]

dc.contributor.authorAlcock, Charles
dc.contributor.authorAllsman, Robyn
dc.contributor.authorAlves, David R
dc.contributor.authorBecker, Andrew C
dc.contributor.authorBennett, D P
dc.contributor.authorCook, Kem H
dc.contributor.authorDrake, Andrew John
dc.contributor.authorFreeman, Kenneth
dc.contributor.authorGriest, K
dc.contributor.authorHawley, Suzanne
dc.contributor.authorKeller, S C
dc.contributor.authorLehner, M J
dc.contributor.authorLepischak, D
dc.contributor.authorMarshall, S L
dc.contributor.authorMinniti, D
dc.contributor.authorNelson, C A
dc.contributor.authorPeterson, Bruce
dc.contributor.authorPopowski, P
dc.contributor.authorPratt, M
dc.contributor.authorQuinn, Peter J
dc.contributor.authorRodgers, Alexander
dc.contributor.authorSuntzeff, Nicholas B
dc.contributor.authorSutherland, William J
dc.contributor.authorVandehei, T
dc.contributor.authorWelch, D L
dc.date.accessioned2015-12-13T23:12:35Z
dc.date.available2015-12-13T23:12:35Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/88132
dc.description.abstractWe present a method for solving the light curve of an eclipsing binary system that contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the Large Magellanic Cloud (LMC). A geometric model is constructed in which the component stars are assumed to be spherical and on circular orbits. The emergent system flux is computed as a function of time, with the intrinsic variations in temperature and radius of the Cepheid treated self-consistently. Fitting the adopted model to photometric observations, incorporating data from multiple bandpasses, yields a single parameter set best describing the system. This method is applied to three eclipsing Cepheid systems from the MACHO project LMC database: MACHO 6.6454.5, 78.6338.24, and 81.8997.87. A best-fit value is obtained for each system's orbital period and inclination and for the relative radius, color, and limb-darkening coefficients of each star. Pulsation periods and parameterizations of the intrinsic color variations of the Cepheids are also obtained, and the amplitude of the radial pulsation of each Cepheid is measured directly. The system 6.6454.5 is found to contain a 4.97 day Cepheid, which cannot be definitely classified as type I or type II, with an unexpectedly brighter companion. The system 78.6338.24 consists of a 17.7 day, W Virginis class type II Cepheid with a smaller, dimmer companion. The system 81.8997.87 contains an intermediate-mass, 2.03 day overtone Cepheid with a dimmer, red giant secondary.
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Binaries: eclipsing; Cepheids; Magellanic Clouds; Stars: AGB and post-AGB; Stars: oscillations
dc.titleThe MACHO Project Large Magellanic Cloud Variable Star Inventory XII. Three Cepheid Variables in Eclipsing Binaries
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume573
dc.date.issued2002
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub17666
local.type.statusPublished Version
local.contributor.affiliationAlcock, Charles, Lawrence Livermore National Laboratory
local.contributor.affiliationAllsman, Robyn, Administrative Division, ANU
local.contributor.affiliationAlves, David R, Space Telescope Science Institute
local.contributor.affiliationBecker, Andrew C, University of Washington
local.contributor.affiliationBennett, D P, University of Notre Dame
local.contributor.affiliationCook, Kem H, Lawrence Livermore National Laboratory
local.contributor.affiliationDrake, Andrew John, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFreeman, Kenneth, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGriest, K, University of California
local.contributor.affiliationHawley, Suzanne, University of Washington
local.contributor.affiliationKeller, S C, Lawrence Livermore National Laboratory
local.contributor.affiliationLehner, M J, University of Pennsylvania
local.contributor.affiliationLepischak, D, McMaster University
local.contributor.affiliationMarshall, S L, Kavli Institute for Particle Astrophysics and Cosmology/Stanford University
local.contributor.affiliationMinniti, D, Pontifica Universidad Catolica
local.contributor.affiliationNelson, C A, Lawrence Livermore National Laboratory
local.contributor.affiliationPeterson, Bruce, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationPopowski, P, Lawrence Livermore National Laboratory
local.contributor.affiliationPratt, M, LIGO Massachusetts Institute of Technology
local.contributor.affiliationQuinn, Peter J, European Southern Observatory
local.contributor.affiliationRodgers, Alexander, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSuntzeff, Nicholas B, Cerro Tololo Inter-American Observatory
local.contributor.affiliationSutherland, William J, University of Cambridge
local.contributor.affiliationVandehei, T, University of California
local.contributor.affiliationWelch, D L, McMaster University
local.bibliographicCitation.startpage338
local.bibliographicCitation.lastpage350
local.identifier.doi10.1086/340560
dc.date.updated2015-12-12T08:32:08Z
local.identifier.scopusID2-s2.0-0038359088
CollectionsANU Research Publications

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