Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.0304l&link_type=abstract
American Astronomical Society Meeting 204, #03.04; Bulletin of the American Astronomical Society, Vol. 36, p.671
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Baliunas Sallie L.
Henry Gregory W.
Lockwood Wesley G.
Radick Richard R.
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