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Long-term Photometry of the Symbiotic Star AG Draconis
Published online by Cambridge University Press: 12 April 2016
Extract
Photoelectric UBV-observations of the well known symbiotic star AG Draconis were obtained between 1982 and 1984 with the 60cm photoelectric reflector II of Sonneberg Observatory. The light curve shows two large optical outbursts: (at JD = 244 5000…5500 and JD = 9000…9500) and two smaller eruptions (at JD = 6200, 6600). The recent outburst is the largest one since 1952.
During the quiet stage a significant variability with an amplitude of about one magnitude is only visible in the U-band. L. Meinunger (1979) detected a period of 554 days and calculated the following ephemeris:
Umax = 243 8900 + 554 · E
All outbursts and smaller eruptions are correlated with the period of the U-maxima, the outburst maxima always coincide with U-maxima of the quiet stage, calculated by the above formula.
- Type
- Cataclysmic Variables: Eruptions and Flickering
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- Copyright © Springer-Verlag 1995