Three periodicities in a 98-year light curve of the symbiotic star Z Andromedae

Details Three periodicities in a 98-year light curve of the symbiotic star Z Andromedae Three periodicities in a 98-year light curve of the symbiotic star Z Andromedae

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..534f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. 534-542

Astronomy and Astrophysics

Astrophysics

38

Light Curve, Periodic Variations, Stellar Models, Stellar Oscillations, Symbiotic Stars, Time Series Analysis, Variable Stars, Amplitude Modulation, Astronomical Photometry, Power Spectra, Stellar Magnitude, Synchronism

Scientific paper

Combining data from various sources we present a visual light curve of the symbiotic star Z Andromedae, covering continuously 98 years of this star's photometric history. Time series analysis reveals a clear, coherent periodicity of 759 days in the light curve, with epoch of minimum light at JD 2442666. We identify this period as the binary period of the star. During outbursts, the star enters an oscillation mode with a quasi-period of 656 days. These oscillations may include a stable, coherent component with a period of 667 days. A third periodicity of approximately 5500 days is also present in the data. It is the beat period between the binary and the high state cycles of Z And. It is found in the light curve of the low state of the star. The light variability of Z And during two, and possibly also a third, major outbursts, out of the 5 observed in the last 98 years, may be fitted to a model of damped driven oscillator.

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