TW Cancri / TW Cnc
Light curve of the EA type eclipsing binary TW Cancri / TW Cnc. This was constructed from 81 unfiltered images taken with Bradford Robotic Telescope (BRT) Cluster Camera between 10 October 2013 and 16 January 2016 (in black); 84 images taken with the Open University COAST telescope (a 14 inch / 35cm Schmidt-Cassegrain) between 22 September 2017 and 19 May 2021 through a V filter (in red), and 39 images taken with the Open University 17 inch / 42 cm corrected Dall-Kirkham between 2021 September 9 and 2023 April 14, also through a V filter (in blue).
Note that these changes in instrumentation were not through my choice, but due to changes to ownership and changes to the available instrumentation at this observatory.
Note that these changes in instrumentation were not through my choice, but due to changes to ownership and changes to the available instrumentation at this observatory.
These results were plotted in the following phase diagram.
The same phase diagram but in monochrome. for clarity;
An enlargement of the primary minimum appears below.
There is a suggestion of a slight dip at phase 0.5, or at least a gap in the general noise!
The GCVS lists this star as having both a primary and a secondary minimum, and the ASAS3 data is consistent with this, showing the secondary to have a depth of ~0.1 mag. More observations needed to get more information regarding the shapes of the minima, and this system remains in my current program. This is in spite of the exposures now being limited to a very noisy 2s(!) by the increased aperture of the telescope.
The catalogue values for the period are 70.760 d (GCVS, AAVSO VSX). There is little o-c activity evident (Kreiner). (Accessed 2023 July 16)
The catalogue values for the period are 70.760 d (GCVS, AAVSO VSX). There is little o-c activity evident (Kreiner). (Accessed 2023 July 16)
[ Page updated 2023 July 16 ]