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

  • S. Söderhjelm (a1), L. Lindegren (a1), F. Van Leeuwen (a2) and D.W. Evans (a2)

Abstract

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.

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References

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van Leeuwen, F., Evans, D.W., Lindegren, L., Penston, M.J., & Ramamani, N. 1992, A&A, 258, 119
Lindegren, L., Høg, E., van Leeuwen, F., Murray, C.A., Evans, D.W., Penston, M.J., Perryman, M.A.C., Petersen, C., Ramamani, N., Snijders, M.A.J., Söderhjelm, S., Andreasen, G.K., Cruise, A.M., Elton, N., Lund, N., & Poder, K. 1992a, A&A, 258, 18
Lindegren, L., van Leeuwen, F., Petersen, C., Perryman, M.A.C., & Söderhjelm, S. 1992b, A&A, 258, 134
McAlister, H.A. & Hartkopf, W.I. 1988, Second Catalog of Interferometric Measurements of Binary Stars, CHARA Contribution No. 2
Perryman, M.A.C. & Hassan, H. (eds.) 1989, The HIPPARCOS Mission, Pre-launch Status, Vol. I, The HIPPARCOS Satellite, ESA SP-1111
Perryman, M.A.C., & Turon, C. (eds.) 1989, The HIPPARCOS Mission, Pre-launch Status, Vol. II, The Input Catalogue, ESA SP-1111
Perryman, M.A.C., Lindegren, L., Murray, C.A., Høg, E., & Kovalevsky, J. (eds.) 1989, The HIPPARCOS Mission, Pre-launch Status, Vol. III, The Data Reductions, ESA SP-1111
Söderhjelm, S., Evans, D.W., van Leeuwen, F., & Lindegren, L. 1992, A&A, 258, 157
Turon, C. et al. 1992, The HIPPARCOS Input Catalogue, ESA SP-1136

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