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Detection and Measurement of Double Stars with HIPPARCOS: Provisional Results from NDAC

Published online by Cambridge University Press:  12 April 2016

S. Söderhjelm ,
L. Lindegren ,
F. Van Leeuwen  and
D.W. Evans
S. Söderhjelm
Affiliation:
Lund Observatory, Box 43, S-221 00 Lund, Sweden
L. Lindegren
Affiliation:
Lund Observatory, Box 43, S-221 00 Lund, Sweden
F. Van Leeuwen
Affiliation:
Royal Greenwich Observatory, Madingley Road, Cambridge CB3 OEZ, UK
D.W. Evans
Affiliation:
Royal Greenwich Observatory, Madingley Road, Cambridge CB3 OEZ, UK

Abstract

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The HIPPARCOS satellite observes 118,000 stars from a predefined list. Some 10% of these are known doubles or multiples, and another 2—3% may ultimately be found to be non-single with separations above 0″.l and magnitude–differences below 4–5. This paper describes briefly the special reduction methods used by NDAC (Northern Data Analysis Consortium) for treating these non-singles. A key feature is the use of the main reduction results to calibrate and collect the data for individual doubles in ‘case history files’. This enables a global solution of both absolute and relative parameters for a double to be carried out in a single step. Using provisional data tapes covering small parts of a 14-month interval, tests have been made of major parts of the double star reductions. These early results are compared with independent HIPPARCOS data and with ground–based speckle interferometry.

Type
Hipparcos First Results
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 412 - 420
Copyright
Copyright © Astronomical Society of the Pacific 1992

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