Four years of photometry of DK draconis=HR 4665 |
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| Authors: | J. A. Eaton D. S. Hall G. W. Henry C. A. Vaucher C. R. Chambliss P. K. Detterline H. J. Landis R. P. Wasatonic H. Louth T. R. Renner A. M. Bloschak J. S. Gillman A. C. Krahnert B. B. McGuinness |
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| Affiliation: | (1) Dyer Observatory, Vanderbilt University, Nashville, Tenn., USA;(2) Kutztown State College, Kutztown, Pa., USA;(3) Landis Observatory, Locust Grove, Ga., USA;(4) Lehigh Valley Amateur Astronomical Society, Allentown, Pa., USA;(5) Louth Observatory, Sedro Wooley, Washington, USA;(6) Scuppernong Observatory, Dousman, Wis., USA;(7) Sperry Observatory, Cranford, N.J., USA;(8) Present address: Clouderoft Observatory, Clouderoft, New Mexico, USA |
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| Abstract: | Differential BV photometry of the K0III+K0III long-period RS CVn-type binary DK Dra=HR 4665 in 1977, 1978, 1979, and 1980 at eight different observatories is presented. A least squares fit to times of maximum and minimum light yields the ephemeris JD=2 443 219.5+63.d75E for times of minimum. This photometric period is 1% shorter than the spectroscopically determined orbital period 64.d44. The light curve was symmetrical and roughly sinusoidal in 1979 and 1980 but was asymmetrical in 1977 and 1978, with a faster rise to maximum. During these four years DK Dra varied between V=6.m07 and 6.m35.Of the AAVSO.Amateur Astronomers, Inc. |
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