Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..285g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, March 1985, p. 285-293.
Astronomy and Astrophysics
Astronomy
18
Calcium, Chromosphere, Late Stars, Stellar Activity, Stellar Rotation, Time Series Analysis, Faculae, Least Squares Method, Light Curve, Signal To Noise Ratios, Solar Rotation, Spectroheliographs, Sunspot Cycle, Sunspots
Scientific paper
Methods of determining stellar rotation and differential rotation from data sets of chromospheric activity indicators are discussed from the point of view of establishing required properties of the time series. Problems inherent in determining differential rotation and partial solutions to these difficulties are addressed. Detection and characterization of stellar differential rotation is a difficult, but approachable goal, and requires a better signal-to-noise ratio in the observations than the problem of rotation period determination. A solar data set of plage areas from the summer of 1982 is used to illustrate the technique.
Fisher Richard Royal
Gilliland Ron L.
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