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Long-term Photometry of the Symbiotic Star AG Draconis

Published online by Cambridge University Press:  12 April 2016

R. Luthardt
R. Luthardt*
Affiliation:
Sonneberg Observatory, 96515 Sonneberg, Germany

Extract

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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
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 262 - 263
Copyright
Copyright © Springer-Verlag 1995

References

Meinunger, L., 1979, IBVS 1611 Google Scholar
Luthardt, R., 1983, Mitt. Veränd. Sterne 9.5, 130 Google Scholar