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The Variability of Sunlike Stars on Decadal Timescales

Published online by Cambridge University Press:  26 May 2016

Richard R. Radick ,
G. W. Lockwood ,
G. W. Henry  and
S. L. Baliunas
Richard R. Radick
Affiliation:
Air Force Research Laboratory, Space Vehicles Directorate, Sunspot, NM, USA
G. W. Lockwood
Affiliation:
Lowell Observatory, Flagstaff, AZ, USA
G. W. Henry
Affiliation:
Tennessee State University, Nashville, TN, USA
S. L. Baliunas
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA

Abstract

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We have combined observations of about 30 sunlike stars from Mount Wilson, Lowell, and Fairborn Observatories to extend our joint time series from 12 to 17 years. The full range of variation on the decadal timescale has probably now been observed for most of our program stars. Statistical relationships between chromospheric and brightness variability derived earlier by us are confirmed. Young active stars become fainter as their chromospheric Ca II HK emission increases, while older less active stars such as the Sun become brighter as their HK emission increases. The Sun's photometric variation still appears somewhat small in amplitude compared to the other stars in this sample with similar mean chromospheric activity.

Type
Part 5: Stellar Magnetic Activity and Evolution
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 264 - 268
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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