The single-sided pulsator CO Camelopardalis

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dc.authoridHandler, Gerald/0000-0001-7756-1568
dc.authoridLaCourse, Daryll/0000-0002-8527-2114
dc.authoridKahraman Alicavus, Filiz/0000-0002-9036-7476
dc.authoridJones, David/0000-0003-3947-5946
dc.authoridVanderburg, Andrew/0000-0001-7246-5438
dc.authoridSchmitt, Allan/0000-0002-5034-0949
dc.authoridKurtz, Donald/0000-0002-1015-3268
dc.contributor.authorKurtz, D. W.
dc.contributor.authorHandler, G.
dc.contributor.authorRappaport, S. A.
dc.contributor.authorSaio, H.
dc.contributor.authorFuller, J.
dc.contributor.authorJacobs, T.
dc.contributor.authorSchmitt, A.
dc.date.accessioned2025-01-27T20:12:20Z
dc.date.available2025-01-27T20:12:20Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractCO Cam (TIC 160268882) is the second 'single-sided pulsator' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am d Sct primary star with T-eff = 7070 +/- 150 K, and a spectroscopically undetected G main-sequence secondary star. The dominant pulsating side of the primary star is centred on the L1 point. We have modelled the spectral energy distribution combined with radial velocities, and independently the TESS light curve combined with radial velocities. Both of these give excellent agreement and robust system parameters for both stars. The d Sct star is an oblique pulsator with at least four low radial overtone (probably) f modes with the pulsation axis coinciding with the tidal axis of the star, the line of apsides. Preliminary theoretical modelling indicates that the modes must produce much larger flux perturbations near the L1 point, although this is difficult to understand because the pulsating star does not come near to filling its Roche lobe. More detailed models of distorted pulsating stars should be developed. These newly discovered single-sided pulsators offer new opportunities for astrophysical inference from stars that are oblique pulsators in close binary stars.
dc.description.sponsorshipUK Science and Technology Facilities Council (STFC) [ST/M000877/1]; Polish National Science Centre (NCN) [2015/18/A/ST9/00578]; Rose Hills Foundation; Sloan Foundation [FG-2018-10515]; State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU); European Regional Development Fund (FEDER) [AYA2017-83383-P]; Spanish Ministry of Science, Innovation and Universities [P/308614]; General Budgets of the Autonomous Community of the Canary Islands by the Ministry of Economy, Industry, Trade and Knowledge; Natural Sciences and Engineering Research Council (NSERC) of Canada; 5th National Committee of the Italian National Institute forNuclear Physics (INFN) under the grantMAPS 3D; NASA Explorer Program; Danish National Research Foundation [DNRF106]; ESA PRODEX [PEA 4000119301]; Stellar Astrophysics Centre (SAC) at Aarhus University; STFC [ST/M000877/1, ST/R000786/1] Funding Source: UKRI
dc.description.sponsorshipDWK acknowledges financial support from the UK Science and Technology Facilities Council (STFC) via grant ST/M000877/1. GH and FKA acknowledge financial support by the Polish National Science Centre (NCN) under grant 2015/18/A/ST9/00578, and thanks Elizaveta Kozlova for making the paper by WojtkiewiczOkulicz available. JF acknowledges support from an Innovator Grant from The Rose Hills Foundation, and the Sloan Foundation through grant FG-2018-10515. DJ acknowledges support from the State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU) and the European Regional Development Fund (FEDER) under grant AYA2017-83383-P. DJ also acknowledges support under grant P/308614 financed by funds transferred from the Spanish Ministry of Science, Innovation and Universities, charged to the General State Budgets and with funds transferred from the General Budgets of the Autonomous Community of the Canary Islands by the Ministry of Economy, Industry, Trade and Knowledge. LNthanks theNatural Sciences and Engineering Research Council (NSERC) of Canada for funding and thanks J. Aiken for his technical assistance. We thankBarry Smalley, Simon Murphy, and Daniel Holdsworth for useful suggestions and discussions, and we thank the anonymous referee for a thoughtful and useful report. We thank Richard Bischoff for supplying his team's CO Cam spectra obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich-Schiller University. MG acknowledges financial support from the 5th National Committee of the Italian National Institute forNuclear Physics (INFN) under the grantMAPS 3D. We thank Richard Bischoff for supplying his team's CO Cam spectra. This paper includes data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. Funding for the TESS Asteroseismic Science Operations Centre is provided by the Danish National Research Foundation (grant agreement no. DNRF106), ESA PRODEX (PEA 4000119301), and Stellar Astrophysics Centre (SAC) at Aarhus University.
dc.identifier.doi10.1093/mnras/staa989
dc.identifier.endpage5133
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85095365776
dc.identifier.scopusqualityQ1
dc.identifier.startpage5118
dc.identifier.urihttps://doi.org/10.1093/mnras/staa989
dc.identifier.urihttps://hdl.handle.net/20.500.12428/20917
dc.identifier.volume494
dc.identifier.wosWOS:000539097800042
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofMonthly Notices of The Royal Astronomical Society
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectstars: individual: CO Cam (TIC 160268882
dc.subjectHD 106112)
dc.subjectstars: oscillations
dc.subjectstars: variables: delta Scuti
dc.titleThe single-sided pulsator CO Camelopardalis
dc.typeArticle

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