First Doppler image and starspot-corrected orbit for $\lambda$ Andromedae: A multifaceted activity analysis
\"O. Adebali, K. G. Strassmeier, I. V. Ilyin, M. Weber, D. Gruner, Zs., Kovari

TL;DR
This study uses Doppler imaging and spectral analysis to correct orbital parameters of the RS CVn binary $mbda$ Andromedae, revealing detailed starspot activity, improved orbital precision, and insights into the system's stellar and orbital characteristics.
Contribution
It presents the first Doppler image of $mbda$ Andromedae and an empirical starspot correction method to refine orbital elements of the binary system.
Findings
Threefold increase in orbital element precision after spot correction
Detection of a dominant cool starspot with 25% surface coverage
Identification of a brown dwarf secondary companion with ~0.1 Msun
Abstract
We quantify the effect of starspots for the orbital elements of the spotted RS CVn binary Andromedae ( And) and present an empirical correction. The aim is to obtain a more precise orbital solution that can be used to better study the system's severe orbital-rotational asynchronism. Phase-resolved high-resolution optical spectra were recorded over the course of 522 days in 2021-2022. We employed two facilities with medium and high resolution spectroscopy for the multiple activity analyses. Doppler imaging is used to reconstruct And's starspots with a high resolution (R= 250 000) and high signal-to-noise ratio spectra. Optimized cross-correlation functions were used to measure precise radial velocities at a level of a few ten's of m/s. The spot-corrected radial velocities enable, on average, a threefold increase in precision of the individual orbital…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
