Computer Science
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988lofa.rept.....l&link_type=abstract
Final Report, 1 Jan. 1984 - 31 Dec. 1987 Lowell Observatory, Flagstaff, AZ.
Computer Science
Chromosphere, Comparison, Photometry, Stellar Luminosity, Sun, Cycles, Mean, Modulation, Precision, Rotary Stability, Stochastic Processes, Time
Scientific paper
Using precision differential photoelectric photometry at 472 and 551 nm, the variability characteristics of 36 solar-type stars (spectral types F, G, and K) and their 65 comparison stars were determined from nearly 2000 measurements made on more than 350 nights between March 1984 and December 1987. The principal conclusions are: (1) about one-half the program stars and one-fourth the comparison stars are demonstrably variable on short-time scales at levels typically 0.3 percent and greater, (2) variability is about twice as common among K stars as among F- and G-type stars, (3) rotational modulation was measurable in nine stars, (4) sixteen program stars and eight comparison stars varied by more than 0.5 percent over four seasons, (5) twenty-six pairs of exceptionally stable stars varied by less than 0.3 percent over four years, (6) variability of the program stars is strongly correlated with independently determined chromospheric activity levels, and (7) inter-season variability is more consistent with long-term cyclic variation than with stochastic fluctuations.
Lockwood Wesley G.
Skiff Brian A.
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