Abstract
view Abstract Citations (20) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet and Optical Observations of AG Draconis Lutz, J. H. ; Lutz, T. E. ; Dull, J. D. ; Kolb, D. D. Abstract IUE satellite observations and ground-based spectroscopic observations of the yellow symbiotic star AG Dra obtained at irregular intervals from 1975 to 1984 are presented. No forbidden lnes are observed in the optical, indicating a high density. The hydrogen emission lines often show a second blueshifted component that is not as strong as the main component. The He I and He II lines do not show a blueshifted component. AG Dra shows photometric variability with a period of 554 days (particularly below 4000 A) and radial-velocity variations with an amplitude of about 7 km/s which are consistent with a period of about 550 days. The N V line in the IUE region shows a P Cygni profile, indicating at least one region of outflow in the system. There may be some density stratification in the emission-line region(s). Publication: The Astronomical Journal Pub Date: August 1987 DOI: 10.1086/114487 Bibcode: 1987AJ.....94..463L Keywords: Astronomical Catalogs; Spaceborne Astronomy; Stellar Spectrophotometry; Symbiotic Stars; Ultraviolet Spectra; Visible Spectrum; Absorption Spectra; Iue; Line Spectra; Spectral Resolution; Astrophysics; STARS: BINARIES full text sources ADS | data products SIMBAD (2) MAST (1)
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