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A program of precision radial velocity measurements using a RL1872 F/30 Reticon as detector and absorption lines of HF for reference (see Campbell and Walker 1979) is being pursued at both CFHT and at DAO, Victoria. While the long term accuracy of the technique will depend on the ability to duplicate and control the state of the HF gas in the absorption cell, oe can achieve a velocity precision in a single observation of a strong-lined star at 10 A/mm dispersion, of ~15 ms-1 at a s/n ~1200. This corresponds to a displacement ~2.10-2 of a 15μ diode spacing. The critical instrumental and calibration techniques are discussed, in particular the temperature stability of the array, photometric calibration of the individual diodes and the measurement of individual diode to diode spacings.© (1981) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
