3 papers
astro-ph.SR2026
Does the solar oxygen abundance change over the solar cycle? An investigation into activity-induced variations of the O I infrared triplet
A. G. M. Pietrow, M. Baratella, I. V. Ilyin +2
The determination of the solar oxygen abundance remains a central problem in astrophysics, as its accuracy is limited not only by models but also by systematics. While many of thes…
astro-ph.SR2025
Surface image and activity-corrected orbit of the RS CVn binary HR 7275: Disentangling activity tracers
Ã. Adebali, M. Weber, K. G. Strassmeier +3
Quantifying stellar parameters and magnetic activity for cool stars in double-lined spectroscopic binaries (SB2) is not straightforward, as both stars contribute to the observed co…
astro-ph.SR2025
Surface activity of a Rossby sequence of cool Hyades stars
K. G. Strassmeier, I. Ilyin, M. Steffen +1
Aims. The Hyades cluster is key for the study of rotational, activity, and chemical evolution of solar-like low-mass stars. Here we present quantitative surface-activity informatio…