The Chromospheric Activity and Variability of Cycling and Flat Activity Solar‐Analog Stars
Citations Over TimeTop 10% of 2004 papers
Abstract
We present an analysis of more than 3700 observations of the Ca II H and K lines in 57 Sun-like stars and over 3000 analogous observations of the Sun. Ten of the 57 stars under consideration are observed in flat states, but these stars do not always exhibit overall Ca II H and K core brightness below that of solar minimum. Solar activity minimum lies near the lowest level observed for stars with cyclic or irregular variability, but many flat stars have HK activity levels comparable to or exceeding that of solar minimum. While flat activity stars may be in periods of extended activity minima analogous to the solar Maunder minimum, a significant reduction in magnetic activity during such periods is not implied (although it is also not rejected) by the data.
Related Papers
- → X-rays from accretion shocks in T Tauri stars: The case of BP Tau(2005)112 cited
- → X-ray emission from MP Muscae: an old classical T Tauri star(2007)61 cited
- X-ray emitting T Tauri stars in the L1551 cloud(1995)
- → The Li/Be Ratio in Main-Sequence Stars(1968)2 cited
- → X-Rays and Activity in Pre-Main Sequence Stars(1993)1 cited