EK Draconis: Long-term photometry on Sonneberg Sky-Patrol plates

H.-E. Fröhlich, R. Tschäpe, G. Rüdiger, K. G. Strassmeier
2002 Astronomy and Astrophysics  
We performed long-term photometry of the young solar analog EK Draconis (HD 129333) using 1030 blue-sensitive Sky-Patrol plates taken at Sonneberg Observatory from 1958 onwards. A secular dimming of 0.0057 ± 0.0008 mag/y beginning around 1975 was found. Hence, the recent trend first observed with Automatic Photoelectric Telescopes (APTs) is confirmed and traced back to the mid-seventies.
doi:10.1051/0004-6361:20020860 fatcat:m3ojvhoipjarheafw646qun7zq