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dc.contributor.authorXiang, Yue
dc.contributor.authorGu, Sheng Hong
dc.contributor.authorCollier Cameron, A.
dc.contributor.authorBarnes, J.R.
dc.date.accessioned2014-11-10T14:44:27Z
dc.date.available2014-11-10T14:44:27Z
dc.date.issued2014-02-01
dc.identifier.citationXiang , Y , Gu , S H , Collier Cameron , A & Barnes , J R 2014 , ' Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004 ' , Monthly Notices of the Royal Astronomical Society , vol. 438 , no. 3 , stt2345 , pp. 2307-2316 . https://doi.org/10.1093/mnras/stt2345
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 7732531
dc.identifier.otherPURE UUID: 6de56c0f-8fdc-4fac-acf6-a39a7ce552fe
dc.identifier.otherScopus: 84894033579
dc.identifier.urihttp://hdl.handle.net/2299/14712
dc.description.abstractWe present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability,we apply least-squares deconvolution technique to calculate average profiles from 2032 photospheric absorption lines. Both of the resulting surface images show a wide latitude distribution of starspots. Most spots are concentrated at a high-latitude belt above 60° and a low-latitude belt near equator. The starspots evolved dramatically between two observing runs, which may indicate shorter time-scale evolution in this epoch, especially for low-latitude belt. There is no stable preferred active longitude that can be found in our images. We also find out a possible phenomenon that the intermediate-latitude spot migrated poleward and merged with the highlatitude spot to make it stronger, which may reveal a more complex behaviour of starspots on II Peg. A potential change of orbital ephemeris zero-point was detected. This may imply an orbital period change of II Peg like other active close binariesen
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectActivity-binaries
dc.subjectClose-stars
dc.subjectII Peg-starspots
dc.subjectImaging-stars
dc.subjectIndividual
dc.subjectstars
dc.subjectSpace and Planetary Science
dc.subjectAstronomy and Astrophysics
dc.titleDistribution and evolution of starspots on the RS CVn binary II Pegasi in 2004en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stt2345
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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