Four years of photometry of DK Draconis = HR 4665

Details Four years of photometry of DK Draconis = HR 4665 Four years of photometry of DK Draconis = HR 4665

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..87..305e&link_type=abstract

Astrophysics and Space Science, vol. 87, no. 1-2, Oct. 1982, p. 305-312.

Astronomy and Astrophysics

Astrophysics

4

Binary Stars, Cepheid Variables, Ephemerides, Orbital Elements, Stellar Spectrophotometry, Ubv Spectra, Ephemeris Time, Least Squares Method, Light Curve

Scientific paper

Differential BV photometry of the K0 III + K0 III 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 + 63.75 d E for times of minimum. This photometric period is 1% shorter than the spectroscopically determined orbital period 64.44 d. 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 = 6.07 and 6.35 m.

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