ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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 . d 75E for times of minimum. This photometric period is 1% shorter than the spectroscopically determined orbital period 64 . d 44. 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 . m 07 and 6 . m 35.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00648926
Permalink