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Astrophysics and Space Science

, Volume 177, Issue 1–2, pp 209–212 | Cite as

MRSP—The muenster redshift project. Astrometric determination of the reference point for wavelength measurements on low-dispersion objective prism plates

  • H. -J. Tucholke
  • P. Schuecker
  • H. Horstmann
  • W. Seitter
Article
  • 26 Downloads

Abstract

The zero point of galaxy redshifts measured from objective prism plates (dispersion 246 nm/mm at Hγ) as part of the Muenster Redshift Project (MRSP) is obtained through transformation of object positions from the corresponding direct plate. Approximately 1000 G-type stars, classified automatically, are used. On the direct plate, positions are obtained from intensity-weighted first moments. On the objective prism plate, object positions are give through the CaII-break and marginal fits to the unwidened spectra. The transformation equations include quadratic terms in the direction of dispersion. The inclusion of third-order and colour terms is discussed. The mean residuals are approximately 0".33 (5 μm on the plate), corresponding to a redshift error of about 700 km/s at z=0.0. This error results mainly from the uncertainty in locating the CaII-break in the low-dispersion spectra. Radial velocities are obtained from the difference between the expected and the measured positions of the CaII-break in the galaxy spectra.

Keywords

Colour Reference Point Radial Velocity Quadratic Term Measured Position 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Pubishers 1991

Authors and Affiliations

  • H. -J. Tucholke
    • 1
  • P. Schuecker
    • 1
  • H. Horstmann
    • 1
  • W. Seitter
    • 1
  1. 1.Astronomisches Institut der Universitaet MuensterMuensterGermany

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