The 1979-1980 dip in the brightness of XX Ophiuchi - Photometry and spectroscopy

Details The 1979-1980 dip in the brightness of XX Ophiuchi - Photometry and spectroscopy The 1979-1980 dip in the brightness of XX Ophiuchi - Photometry and spectroscopy

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pazh....7..736b&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, Dec. 1981, p. 736-740.) Soviet Astronomy Letters, vol. 7, Nov.-Dec. 1981, p. 407-409

Astronomy and Astrophysics

Astronomy

1

Emission Spectra, Stellar Luminosity, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Balmer Series, Brightness, H Alpha Line, Light Curve, Maxima, Minima, Radial Velocity, Radiant Flux Density, Stellar Color

Scientific paper

Photometric and spectroscopic observations of the variable star XX Oph
are reported, as obtained mainly during the 1979-1980 minimum. The U,B,V
photometry indicates a nonmonotonic dependence of U-B color upon V
brightness. The 1979 emission-line spectrum had properties resembling
those observed during prior minima, between 1920 and 1950.

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