The Coravel

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Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977msngr...8....3m&link_type=abstract

The Messenger, vol. 8, p. 3-3

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The measurement of radial velocities, i.e. the velocity in the direction of the line of sight, is of fundamental importance in stellar as well as in galaxy astronomy. Until the 1960s the only possible method was to obtain a spectrum on a photographie plate and then measure the displacement of the spectral lines. These observations were extremely time-consuming for faint objects. With the advent of image-intensifying devices, the observing time was drastically reduced, but so was-unfortunately-the accuracy of the measurement, due to geometrie distortions in the image tubes. Now, however, the situation has improved very much indeed, as explains Dr. M. Mayor of the Geneva Observatory, who, together with several European colleagues, is building a spectrometer to determine stellar radial velocities by a carrelation method.

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