Accession Number:

ADA523085

Title:

Binary Star Orbits. III. In which we Revisit the Remarkable Case of Tweedledum and Tweedledee

Descriptive Note:

Research rept.

Corporate Author:

NAVAL OBSERVATORY WASHINGTON DC

Report Date:

2010-06-14

Pagination or Media Count:

29.0

Abstract:

Two of the most challenging objects for optical interferometry in the middle of the last century were the close components FIN 332 of the wide visual binary STF2375 WDS 184550530 HIP 92027 ADS 11640. Each component of the wide pair was found to have subcomponents of approximately the same magnitude, position angle and separation and, hence, were designated by the tongue in cheek monikers Tweedledum and Tweedledee by the great visual interferometrist William S. Finsen in 1953. They were later included in a list of Double Stars that Vex the Observer by W.H. van den Bos 1958a. While speckle interferometry has reaped a rich harvest investigating the close inteferometric binaries of Finsen, the Tweedles have continued to both fascinate and exasperate due to both the great similarity of the close pairs as well as the inherent 180 ambiguity associated with interferometry. Detailed analysis of all published observations of the system have revealed several errors which are here corrected, allowing for determination of these orbital elements which resolve the quadrant ambiguity. A unique software filter was developed which allowed subarrays from archival ICCD speckle data from 1982 to be re-reduced.

Subject Categories:

  • Astronomy
  • Astrophysics
  • Celestial Mechanics
  • Miscellaneous Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE