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dc.contributor.authorXiang, Yue
dc.contributor.authorGu, Sheng Hong
dc.contributor.authorCollier Cameron, A.
dc.contributor.authorBarnes, J.R.
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 .
dc.identifier.otherPURE: 7732531
dc.identifier.otherPURE UUID: 6de56c0f-8fdc-4fac-acf6-a39a7ce552fe
dc.identifier.otherScopus: 84894033579
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.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectII Peg-starspots
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.typeJournal Article/Review

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