AAS 204th Meeting, June 2004
Session 3 Stellar-Solar Connection
SPD Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

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[3.04] A Comparison of Solar Irradiance Variations with those of Similar Stars

G. W. Lockwood (Lowell Observatory), R. R. Radick (AFRL/VS), G. W. Henry (Tennessee State University), S. L. Baliunas (Center for Astrophysics)

The photometric variations of Sun-like stars, including one bona fide ``solar twin," HD146233 = 18 Sco, have been observed at Lowell Observatory and Fairborn Observatory in b and y filters of the uvby photometric system over the past 3-18 years. Parallel HK flux measurements were made at the Mount Wilson Observatory. Thirty five stars observed at Lowell and Fairborn for more than a decade combined define a power law relationship of variability as a function of mean chromopsheric activity. On this diagram, the Sun lies 3x lower than stars of similar chromospheric activity. Restricting the sample to stars observed only at Fairborn but for a shorter length of time reduces the discrepancy to less than a factor of two. Nevertheless, the Sun still lies below a fitted power law. We will present an analysis of the various biases possibly present in our data and show some example light curves.

This work was supported by the National Science Foundation, the National Aeronautics and Space Administration, and the Air Force Office of Scientific Research.

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