CK Aqr time keeping. Evidence for a ternary
12 Feb 2021
Photometric measurements of the contact binary system CK Aqr are
presented. 49 times of minimum were obtained between 2005 and 2020. Along
with already published observations, this allows the derivation of an
improved ephemeris. The resulting O-C diagram shows oscillations which
are interpreted as the light time travel effect due to a third component,
with a period of 8.2 years.
Plublished in OEJV
issue 209 (30.12.2020): the
article, with a photometry
file and a ToM
Local copy (may not be available on-line).
Telescope and camera configuration.
Computer and software configuration.