23 citations · 42 across the 9 of their papers we have counts for
8 papers · 1 filter
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…
Surface image and activity-corrected orbit of the RS CVn binary HR 7275: Disentangling activity tracers
Ö. 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…
Untangling the Sources of Abundance Dispersion in Low-metallicity Stars II: Neutron Capture Elements
Emily J. Griffith, Marissa Blum, David H. Weinberg +4
We present the abundances of 23 elements, including 11 heavy elements (Cu, Zn, Sr, Y, Zr, Ba, La, Ce, Nd, Sm, Eu) for up to 86 metal-poor (-2 < [Fe/H] < -1) subgiants. We use KORG,…
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…
Weakened Magnetic Braking Signals the Collapse of the Global Stellar Dynamo
Travis S. Metcalfe, Jennifer L. van Saders, Marc H. Pinsonneault +7
Weakened magnetic braking (WMB) was originally proposed in 2016 to explain anomalously rapid rotation in old field stars observed by the Kepler mission. The proximate cause was sug…
First Doppler image and starspot-corrected orbit for Andromedae: A multifaceted activity analysis
Ö. Adebali, K. G. Strassmeier, I. V. Ilyin +3
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…
Testing the Rossby Paradigm: Weakened Magnetic Braking in early K-type Stars
Travis S. Metcalfe, Pascal Petit, Jennifer L. van Saders +12
There is an intricate relationship between the organization of large-scale magnetic fields by a stellar dynamo and the rate of angular momentum loss due to magnetized stellar winds…
LBT/PEPSI Spectropolarimetry of a Magnetic Morphology Shift in Old Solar-type Stars
Travis S. Metcalfe, Oleg Kochukhov, Ilya V. Ilyin +3
Solar-type stars are born with relatively rapid rotation and strong magnetic fields. Through a process known as magnetic braking, the rotation slows over time as stellar winds grad…