Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977crasb.285..117b&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie B - Sciences Physiques, vol. 285, no. 4, Sept. 12, 1977, p. 117-120. In Fre
Astronomy and Astrophysics
Astronomy
13
Astrometry, Echelle Gratings, Radial Velocity, Spectrometers, Stellar Rotation, Velocity Measurement, Echelette Gratings, Stellar Luminosity
Scientific paper
The basic relations for the dispersion and coincidence fault (mismatch) of an echelette grating (for lower orders) and an echelle grating (for higher orders), used to determine stellar radial velocities by means of a photoelectric spectrometer, are given. To improve the coincidence of an echelle grating, it is proposed to move the slit by means of an oscillating blade, so that in actuality the real slit and mask are immobile, with only the blade moving. By this means a mismatch of plus or minus 1.2 percent has been attained. In ten independent measurements of 30 sec duration with a 1 meter telescope and an echelle grating, the mean square deviation for a K star of photographic magnitude 11 was 0.7 km/sec.
Baranne Andre
Mayor Marcel
Poncet J.-L.
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