Journal
ASTRONOMICAL JOURNAL
Volume 138, Issue 1, Pages 312-322Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/1/312
Keywords
stars: activity; Sun: activity
Categories
Funding
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [0742144] Funding Source: National Science Foundation
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We present 14 years of contemporaneous photometric and spectroscopic observations of 28 solar analog stars, taken with the Tennessee State University Automatic Photometric Telescopes at Fairborn Observatory and the Solar-Stellar Spectrograph at Lowell Observatory. These are the best observed and most nearly Sun-like of the targets in our magnitude-limited (V <= 7.5) sample. The correlations between luminosity and activity reveal the expected inverse activity-brightness correlations for active stars. Strong direct correlations between activity and brightness are not prevalent for the less active solar age stars, but are precision limited. The Sun does not appear to have unusually low photometric variability when compared with the most Sun-like inactive solar analogs. We present evidence that the activity index R-HK' is not a good discriminant of Maunder Minimum candidate stars. On the basis of a star that appears to have transitioned from a low-variability state to a cycling state, we investigate the regime in which stars might switch from faculae-dominated to spot-dominated variations.
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