Doppler images of DI Psc during 2004-2006

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Lindborg, M. Hackman, T. Mantere, M.J. Korhonen, H. Ilyin, I. Kochukhov, O. Piskunov, N. 2018-08-01T13:27:55Z 2018-08-01T13:27:55Z 2014
dc.identifier.citation Lindborg , M , Hackman , T , Mantere , M J , Korhonen , H , Ilyin , I , Kochukhov , O & Piskunov , N 2014 , ' Doppler images of DI Psc during 2004-2006 ' ASTRONOMY AND ASTROPHYSICS , vol 562 , A139 . DOI: 10.1051/0004-6361/201322669 en
dc.identifier.issn 0004-6361
dc.identifier.issn 1432-0746
dc.identifier.other PURE UUID: 5d77b64f-7314-4a89-8b06-ab3d276287b5
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
dc.identifier.other PURE FILEURL:
dc.description VK: resolve; Karhunen, J.; ReSoLVE
dc.description.abstract Aims. DI Psc (HD 217352) is a Li-rich, rapidly rotating single K giant. We set out to study the spot configuration and activity level by calculating surface temperature maps of the star. Methods. We apply the Doppler imaging method on high-resolution optical spectroscopy obtained during 2004–2006. Results. In July–August 2004, no clear spot structures were visible, but the spot coverage increased in July 2005, and cool spots emerged, especially at intermediate latitudes. Later on in September 2006, the spot coverage increased and cool spots were visible on both sides of the equator. However, the map of 2006 suffers from bad phase coverage, meaning it is not possible to draw definite conclusions on the spot locations during that season. Conclusions. Compared with earlier Doppler maps of DI Psc and temperature maps obtained for other late-type stars with similar rotation rates, DI Psc seems to be in a low activity state especially during the observing season of July–August 2004. During the 2005 and 2006 observing seasons, the spot activity seen in the spectral line profiles and inferred from Doppler images increases, and the temperature contrast in our last map is more comparable to what was reported in an earlier study. Therefore, it can be concluded that the spot activity level of the star is variable over time. However, the present and previous Doppler images form too short a time series to draw conclusions about a possible activity cycle in DI Psc. en
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries ASTRONOMY AND ASTROPHYSICS en
dc.relation.ispartofseries Volume 562 en
dc.rights openAccess en
dc.subject.other 113 Computer and information sciences en
dc.title Doppler images of DI Psc during 2004-2006 en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Centre of Excellence Research on Solar Long-Term Variability and Effects, ReSoLVE
dc.subject.keyword 113 Computer and information sciences
dc.identifier.urn URN:NBN:fi:aalto-201808014184
dc.identifier.doi 10.1051/0004-6361/201322669
dc.type.version publishedVersion

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