A1 Refereed original research article in a scientific journal
Contemporaneous Imaging Comparisons of the Spotted Giant σ Geminorum Using Interferometric, Spectroscopic, and Photometric Data
Authors: Roettenbacher RM, Monnier JD, Korhonen H, Harmon RO, Baron F, Hackman T, Henry GW, Schaefer GH, Strassmeier KG, Weber M, ten Brummelaar TA
Publisher: IOP PUBLISHING LTD
Publication year: 2017
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Article number: 120
Volume: 849
Issue: 2
Number of pages: 16
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/aa8ef7
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/28397182
Nearby active stars with relatively rapid rotation and large starspot structures offer the opportunity to compare interferometric, spectroscopic, and photometric imaging techniques. In this paper, we image a spotted star with three different methods for the first time. The giant primary star of the RS Canum Venaticorum binary sigma. Geminorum (sigma Gem) was imaged for two epochs of interferometric, high-resolution spectroscopic, and photometric observations. The light curves from the reconstructions show good agreement with the observed light curves, supported by the longitudinally consistent spot features on the different maps. However, there is strong disagreement in the spot latitudes across the methods.
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