Abstract
view Abstract Citations (18) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Light Variations of AG Draconis in its Quiet State Kaler, James B. Abstract Light curves of the yellow symbiotic star AG Draconis are constructed in 11 intermediate and narrow wavelength bands from the near ultraviolet to the far red, using observations made while the star was in its normal state. The curves from Stromgren uvby, 4428 A, and at wide and narrow H-beta are obtained over the entire 1311-day observing interval. The periodic variation of the system is the largest by far at u, and becomes smaller with increasing wavelength until it disappears in the red. The flux at y passes through a minimum with u, but dips again as, or slightly after, u goes through maximum. The latter event probably represents a secondary eclipse of the K giant by the orbiting gas accreting onto the dwarf companion, from which a gas-cloud diameter of about 1.6 AU can be inferred. Superimposed on the smooth u light curve are relatively sudden variations with amplitudes of less than about 0.1 mag that occur within intervals of a few days. Publication: The Astronomical Journal Pub Date: August 1987 DOI: 10.1086/114485 Bibcode: 1987AJ.....94..437K Keywords: K Stars; Light Curve; Periodic Variations; Radiant Flux Density; Symbiotic Stars; Visible Spectrum; Giant Stars; H Alpha Line; H Beta Line; Stellar Magnitude; Stellar Winds; Ubv Spectra; Astrophysics; STARS: BINARIES full text sources ADS | data products SIMBAD (3)
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