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Irradiance Variations of Stars

Published online by Cambridge University Press:  12 April 2016

G. Wesley Lockwood
G. Wesley Lockwood*
Affiliation:
Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA

Abstract

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Using a nine-year time series of photometric observations of 33 stars similar in temperature and mass to the Sun, but covering a wide range of age and mean chromospheric activity, we found that a majority varies from year to year, some by as much as several percent. We describe the methodology, circumstances of the observations, and photometric results. Stars most similar in mean chromospheric activity to the Sun varied by amounts several times greater than the Sun over a comparable time interval. Thus, the Sun’s present low level of variability, as measured from 1980 to 1989 by the Solar Maximum Mission, appears unusual.

Type
General Reviews on Observations of Solar and Stellar Irradiance Variability from Space and from the Ground
Information
International Astronomical Union Colloquium , Volume 143: The Sun as a Variable Star: Solar and Stellar Irradiance Variations , 1994 , pp. 20 - 27
Copyright
Copyright © Kluwer 1994

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