CCD speckle observations of binary stars from the southern hemisphere. II. Measures from the Lowell-Tololo telescope during 1999

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Title: CCD speckle observations of binary stars from the southern hemisphere. II. Measures from the Lowell-Tololo telescope during 1999
Author: Horch, Elliott; Ninkov, Zoran; Franz, Otto
Abstract: Speckle observations of 145 double stars and suspected double stars are presented and discussed. On the basis of multiple observations, a total of 280 position angle and separation measures are determined, as well as 23 high-quality nondetections. All observations were taken with the (unintensified) Rochester Institute of Technology fast-readout CCD camera mounted on the Lowell-Tololo 61 cm telescope at the Cerro Tololo Inter-American Observatory during 1999 October. We find that the measures, when judged as a whole against ephemeris positions of binaries with very well-known orbits, have root mean square deviations of (1.8+/- 0.3) degrees in position angle and (13+/-2) mas in separation. Eleven double stars discovered by Hipparcos were also successfully observed, and the change in position angle and/or separation since the Hipparcos observations was substantial in three cases (Refer to PDF file for exact formulas).
Description: Article may also be accessed on publisher's website at: http://www.journals.uchicago.edu/AJ/journal/contents/v120n5.html
Record URI: http://hdl.handle.net/1850/3033
Date: 2000-11

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