Darrel B. Hoff
University of Northern Iowa
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Publication
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Journal of Astrophysics and Astronomy | 1991
S Douglas; Gregory W. Henry; Dietmar Böhme; Peter A. Brooks; George L. Fortier; Robert E. Fried; Russell Merle Genet; Bruce S. Grim; Darrel B. Hoff; Kevin Krisciunas; Howard J. Landis; Howard Louth; L. P. Lovell; Bobby E. Powell; Harry D. Powell; Don Pray; T. R. Renner; Charles W. Rogers; Stephen Shervais; D. M. Slauson; H. J. Stelzer; Arthur J. Stokes; Jack C. Troeger; Louis C. Turner; Norman F. Wasson; Kenneth Zeigler
We present photoelectric photometry of λ And never before published, obtained between February 1982 and December 1990 at 29 different observatories. Then we combine it with all other photometry available to us (previously published, contained in the I.A.U. Commission 27 Archives, and obtained with the Vanderbilt 16-inch automatic telescope but not yet published), to yield a 14.8-year data base. Analysis reveals a long-term cycle in mean brightness, with a full range of 0m.15 and a period of 11.4 ± 0.4 years. Because most of our new photometry was concentrated in the 1983-84 observing season, we analyze that one well-defined light curve with a two-spot model. Spot A keeps a 0m.04 amplitude throughout four rotation cycles whereas the amplitude of spot B diminishes from 0m.09 down almost to 0m.03. The spot rotation periods were 55d.9 ± 0d.6 and 520d.8 ± 1d.0, respectively.
Archive | 1987
Larry Kelsey; Darrel B. Hoff
Archive | 1986
John R. Percy; Michael G. Richer; H. Bozic; Petr Harmanec; J. Horn; P. Koubsky; Svatopluk Kriz; Larry Kelsey; Darrel B. Hoff; Howard J. Landis; R. C. Reisenweber; Robert J. Wasson
Archive | 1985
Louis J. Boyd; Russell Merle Genet; D. S. Hall; W. T. Persinger; Robert E. Fried; N. F. Wasson; H. J. Stelzer; R. D. Lines; Penelope Brooks; Darrel B. Hoff
Archive | 1985
W. S. Barksdale; Louis J. Boyd; Russell Merle Genet; Robert E. Fried; D. S. Hall; W. T. Persinger; Darrel B. Hoff; S. I. Ingvarsson; Palle Bach Nielsen; H. J. Stelzer; N. F. Wasson
Archive | 1984
R. C. Crawford; S. I. Ingvarsson; Louis J. Boyd; Russell Merle Genet; W. S. Barksdale; W. T. Persinger; Hugh Powell; Walter J. Bisard; H. J. Stelzer; Darrel B. Hoff; A. M. Heiser; Douglas S. Hall; Francis C. Fekel
Archive | 1984
Darrel B. Hoff; Larry Kelsey
School Science and Mathematics | 1978
Darrel B. Hoff; Adrian Hoff
School Science and Mathematics | 1970
Darrel B. Hoff
School Science and Mathematics | 1970
Darrel B. Hoff
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