Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2378o&link_type=abstract
Astronomical Journal v.110, p.2378
Astronomy and Astrophysics
Astronomy
8
Stars: Individual: Ku Cygni, Accretion Disks, Binaries: Eclipsing
Scientific paper
We present new photometric and spectroscopic analyses of the totally eclipsing accretion-disk binary KU Cygni. Weak lines in the Hα and λ7774 Å spectral regions yield radial-velocity curves of both stars. We obtain new photometric solutions with the revised Wilson eclipsing binary computer model. In spite of complications from an accretion disk around the hotter star, we find a fairly reliable simultaneous Iγbυ solution. The mass ratio, a compromise of spectroscopic and photometric results, is near 0.12. The hotter star rotates supersynchronously and is somewhat over-massive for its luminosity, while the K giant contact component has a mass of about 0.5 Msun. A separate ultraviolet solution reveals about one magnitude of excess u light in primary-eclipse totality. This excess, discovered by Popper, is probably uneclipsed disk light. KU Cyg shares these characteristics with several other long-period Algol-type binaries.
Dewey Mark R.
Etzel Paul B.
Olson Edward C.
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