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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

New 1982 - 1990 Photometry of λ Andromedae and Its 11-Year Cycle

Hall, Douglas S., Henry, Gregory W., Böhme, Dietmar, Brooks, Peter A., Chang, Sandy, Dolzan, Ales, Fortier, George L., Fried, Robert E., Genet, Russell M., Grim, Bruce S., Hannon, James, Hoff, Darrel B., Krisciunas, Kevin, Landis, Howard J., Louth, Howard P., Lovell, Larry P., Nielsen, Paul, Powell, Bobby E., Powell, Harry D., Pray, Don, Renner, Thomas R., Rogers, Charles W., Shervais, Stephen, Slauson, Douglas M., Slote, Samuel, Stelzer, Harold J., Stokes, Arthur J., Troeger, Jack C. 01 December 1991 (has links)
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.

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