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Patterns of Photometric and Chromospheric Variation among Sun-like Stars: A 20 Year Perspective
We examine patterns of variation of 32 primarily main-sequence Sun-like stars [selected at project onset as stars on or near the main sequence and color index 0.42 ≤ (B - V) ≤ 1.4], extending our…
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Photometric and Ca II H and K Spectroscopic Variations in Nearby Sun-like Stars with Planets. III.
We present the results of an analysis of time-series photometry, Ca II H and K spectrophotometry, and high-dispersion visible spectra of nine nearby Sun-like stars recently identified as having…
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Properties of Sun-like Stars with Planets: ρ1 Cancri, τ Bootis, and υ Andromedae
Planets have been reported orbiting the Sun-like stars ρ1 Cnc, τ Boo, and υ And based on low-amplitude radial velocity variations. We have derived information on the first two stars from analysis of…
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THE MOUNT WILSON OBSERVATORY S-INDEX OF THE SUN
The most commonly used index of stellar magnetic activity is the instrumental flux scale of singly ionized calcium H & K line core emission, S, developed by the Mount Wilson Observatory (MWO) HK…
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Magnetic Field and Rotation in Lower Main-Sequence Stars: An Empirical Time-Dependent Magnetic Bode's Relation?
We find a significant correlation between the magnetic and rotational moments for a sample of 112 lower main-sequence stars. The rotational moment is calculated from measurements of the rotation…
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Dynamics of the intertropical convergence zone over the western Pacific during the Little Ice Age
Precipitation patterns in the western Pacific changed at the onset of the Little Ice Age. A synthesis of precipitation reconstructions suggests that this change resulted from a contraction of the…
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Proxy climatic and environmental changes of the past 1000 years
The 1000 yr climatic and environmental history of the Earth contained in various proxy records is reviewed. As indicators, the proxies duly represent local climate. Because each is of a different…
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Environmental Effects of Increased Atmospheric Carbon Dioxide
A review of the literature concerning the environmental consequences of increased levels of atmospheric carbon dioxide leads to the conclusion that increases during the 20th century have produced no…
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Multiple and changing cycles of active stars - II. Results
Aims. We study the time variations in the cycles of 20 active stars based on decade-long photometric or spectroscopic observations. Methods. A method of time-frequency analysis, as discussed in a…
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Magnetic cycles at different ages of stars
We study the different patterns of interannual magnetic variability in stars on or near the lower main sequence, approximately solar-type (G-K dwarf) stars in time series of 36 years from the Mount…
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