The ultraviolet/optical variability of PG 1553+11

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bl Lacertae Objects, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Variability, Visible Spectrum, Accretion Disks, Stellar Color, Stellar Luminosity

Scientific paper

Ultraviolet optical observations of the BL Lacertae object, PG 1553+11,
indicate that significant color variations are associated with the
luminosity variations seen in the ultraviolet and the optical regions of
the spectrum. The color variations are consistent with the presence of
an accretion disk in this system.

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