Contemporaneous Imaging Comparisons of the Spotted Giant $\sigma$ Geminorum Using Interferometric, Spectroscopic, and Photometric Data

Abstract

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.

Accepted to ApJ, 19 pages, 16 figures, 5 tables

References in corpus (8)

• Imaging the Surface of Altair
• Placing the spotted T Tauri star LkCa 4 on an HR diagram
• Older and Colder: The impact of starspots on pre-main sequence stellar evolution
• Imaging and Modeling Rapidly Rotating Stars: Alpha Cephei and Alpha Ophiuchi
• No Sun-like dynamo on the active star $\zeta$ Andromedae from starspot asymmetry
• First Zeeman Doppler imaging of a cool star using all four Stokes parameters
• The Expanding Fireball of Nova Delphini 2013
• Antisolar differential rotation of the K1-giant sigma Geminorum revisited

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