A multiwavelength study of the M dwarf binary YY Geminorum

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dc.authoridHuovelin, Juhani/0000-0002-6276-5776
dc.contributor.authorButler, C. J.
dc.contributor.authorErkan, N.
dc.contributor.authorBudding, E.
dc.contributor.authorDoyle, J. G.
dc.contributor.authorFoing, B.
dc.contributor.authorBromage, G. E.
dc.contributor.authorKellett, B. J.
dc.date.accessioned2025-01-27T20:55:59Z
dc.date.available2025-01-27T20:55:59Z
dc.date.issued2015
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe review the results of the 1988 multiwavelength campaign on the late-type eclipsing binary YY Geminorum. Observations include: broad-band optical and near-infrared photometry, simultaneous optical and ultraviolet (IUE) spectroscopy, X-ray (Ginga) and radio (VLA) data. From models fitted to the optical light curves, fundamental physical parameters have been determined together with evidence for transient maculations (spots) located near quadrature longitudes and intermediate latitudes. Eclipses were observed at optical, ultraviolet and radio wavelengths. Significant drops in 6 cm radio emission near the phases of both primary and secondary eclipse indicate relatively compact radio emitting volumes that may lie between the binary components. IUE observations during secondary eclipse are indicative of a uniform chromosphere saturated with Mg II emission and an extended volume of Ly alpha emission. Profile fitting of high-dispersion Ha spectra confirms the chromospheric saturation and indicates significant Ha opacity to heights of a few per cent of the photospheric radius. There is evidence for an enhanced Ha emission region visible near phase 0.25-0.35 which may be associated with a large spot on the primary and with two small optical flares which were also observed at other wavelengths: one in microwave radiation and the other in X-rays. For both flares, L-X/L-opt is consistent with energy release in closed magnetic structures.
dc.description.sponsorshipEuropean Student Exchange Programme (ERASMUS); Department for Culture, Arts and Leisure of Northern Ireland
dc.description.sponsorshipNE wishes to acknowledge support of the European Student Exchange Programme (ERASMUS) for a three month period of research and study at Armagh Observatory. EB acknowledges stimulative input and hospitality from Armagh Observatory. We wish to thank: the National Radio Astronomy Observatories of the USA for time on the VLA, the University of Hawaii for access to the 60 cm telescope on Mauna Kea, the European Space Agency for observations with the IUE satellite, the Science and Engineering Research Council of the United Kingdom for access to UKIRT and the Institute of Space and Aeronautical Science of Japan (ISAS) for hospitality and technical assistance during observations with the Japan-UK LAC instrument on Ginga. Research at Armagh Observatory is grant-aided by the Department for Culture, Arts and Leisure of Northern Ireland.
dc.identifier.doi10.1093/mnras/stu2398
dc.identifier.endpage4219
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue4
dc.identifier.scopus2-s2.0-84985903302
dc.identifier.scopusqualityQ1
dc.identifier.startpage4205
dc.identifier.urihttps://doi.org/10.1093/mnras/stu2398
dc.identifier.urihttps://hdl.handle.net/20.500.12428/26264
dc.identifier.volume446
dc.identifier.wosWOS:000350272400075
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: activity
dc.subjectbinaries: eclipsing
dc.subjectstars: flare
dc.subjectstarspots
dc.titleA multiwavelength study of the M dwarf binary YY Geminorum
dc.typeArticle

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