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Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004
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dc.contributor.author | Xiang, Y. | |
dc.contributor.author | Gu, S.-H. | |
dc.contributor.author | Collier Cameron, A. | |
dc.contributor.author | Barnes, J.R. | |
dc.date.accessioned | 2014-09-09T11:31:03Z | |
dc.date.available | 2014-09-09T11:31:03Z | |
dc.date.issued | 2014-03-01 | |
dc.identifier.citation | Xiang , 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 , pp. 2307-2316 . https://doi.org/10.1093/mnras/stt2345 | en |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | PURE: 146987584 | |
dc.identifier.other | PURE UUID: 3c9a1de8-7285-4aac-97b1-6040f0c1ee3b | |
dc.identifier.other | Scopus: 84894033579 | |
dc.identifier.other | ORCID: /0000-0002-8863-7828/work/58531446 | |
dc.identifier.other | WOS: 000331877000024 | |
dc.identifier.uri | https://hdl.handle.net/10023/5392 | |
dc.description | This work is supported by National Natural Science Foundation of China through grants Nos. 10373023, 10773027 and 11333006, Chinese Academy of Sciences through project KJCX2-YW-T24. | en |
dc.description.abstract | We 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 high-latitude 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 binaries. | |
dc.format.extent | 10 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en |
dc.rights | © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society | en |
dc.subject | Stars: activity | en |
dc.subject | Binaries: close | en |
dc.subject | Stars: imaging | en |
dc.subject | Stars: individual: II Peg | en |
dc.subject | Starspots | en |
dc.subject | QB Astronomy | en |
dc.subject | QC Physics | en |
dc.subject.lcc | QB | en |
dc.subject.lcc | QC | en |
dc.title | Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004 | en |
dc.type | Journal article | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.sponsor | PPARC - Now STFC | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.description.version | Publisher PDF | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.identifier.doi | https://doi.org/10.1093/mnras/stt2345 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | ST/J001651/1 | en |
dc.identifier.grantnumber | ST/I000666/1 | en |
dc.identifier.grantnumber | PP/D000890/1 | en |
dc.identifier.grantnumber | ST/G001006/1 | en |
dc.identifier.grantnumber | PP/F000065/1 | en |
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