dc.contributor.author | Xiang, Yue | |
dc.contributor.author | Gu, Sheng Hong | |
dc.contributor.author | Collier Cameron, A. | |
dc.contributor.author | Barnes, J.R. | |
dc.date.accessioned | 2014-11-10T14:44:27Z | |
dc.date.available | 2014-11-10T14:44:27Z | |
dc.date.issued | 2014-02-01 | |
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 , stt2345 , pp. 2307-2316 . https://doi.org/10.1093/mnras/stt2345 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/2299/14712 | |
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 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 binaries | en |
dc.format.extent | 10 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Activity-binaries | |
dc.subject | Close-stars | |
dc.subject | II Peg-starspots | |
dc.subject | Imaging-stars | |
dc.subject | Individual | |
dc.subject | stars | |
dc.subject | Space and Planetary Science | |
dc.subject | Astronomy and Astrophysics | |
dc.title | Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004 | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1093/mnras/stt2345 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |