179 citations · 2.3k across the 86 of their papers we have counts for
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Zeeman Doppler Imaging of ksi Boo A and B
K. G. Strassmeier, T. A. Carroll, I. V. Ilyin
We present a magnetic-field surface map for both stellar components of the young visual binary ksi Boo AB (A: G8V, B: K5V). Employed are high resolution Stokes-V spectra obtained w…
A rotational age for the open cluster NGC 2281
D. J. Fritzewski, S. A. Barnes, J. Weingrill +3
Cool star rotation periods have become an important tool in determining ages of open clusters. We aim to estimate the age of the open cluster NGC 2281 based on the rotational prope…
Constraints on Magnetic Braking from the G8 Dwarf Stars 61 UMa and Cet
Travis S. Metcalfe, Klaus G. Strassmeier, Ilya V. Ilyin +11
During the first half of their main-sequence lifetimes, stars rapidly lose angular momentum to their magnetized winds, a process known as magnetic braking. Recent observations sugg…
VPNEP: Detailed characterization of TESS targets around the Northern Ecliptic Pole
K. G. Strassmeier, M. Weber, D. Gruner +13
We embarked on a high-resolution optical spectroscopic survey of bright Transiting Exoplanet Survey Satellite (TESS) stars around the Northern Ecliptic Pole (NEP), dubbed the Vatic…
Surface activity of the G dwarf primary in the quaternary star system V815 Her
Zsolt Kővári, Klaus G. Strassmeier, Tamás Borkovits +4
We investigate the magnetic activity of the G dwarf primary star in the multiple system V815 Herculis. Recently, TESS Sector 26 data have revealed that V815 Her is in fact a four-s…
On the lithium abundance of the visual binary components Boo A (G8V) and Boo B (K5V)
Klaus G. Strassmeier, Matthias Steffen
A spectroscopic investigation of the lithium resonance doublet in Boo A and Boo B in terms of both abundance and isotopic ratio is presented. We obtained new =130\,000 s…