Radial velocity measurements with the Asiago nebular spectrograph

Details Radial velocity measurements with the Asiago nebular spectrograph Radial velocity measurements with the Asiago nebular spectrograph

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mmsai..46...69b&link_type=abstract

Società Astronomica Italiana, Memorie, vol. 46, Feb. 1975, p. 69-79.

Physics

Optics

14

Astronomical Spectroscopy, Galactic Rotation, Image Tubes, Planetary Nebulae, Radial Velocity, Spectrographs, Data Reduction, Geomagnetism, Magnetic Effects, Spectral Resolution, Velocity Measurement

Scientific paper

In connection with current spectroscopic work, the accuracy of radial-velocity determinations with the nebular image-tube spectrograph of the Asiago Astrophysical Observatory has been investigated. The planetary nebulae NGC 6826 and IC 2149 have been observed as standards. Once the distortions introduced by the optics and the image tube are removed, the measured values of the radial velocities are in good agreement with those previously known. The mean error of a single measurement along the emission line is plus or minus 13 km/sec. The effect of the terrestrial magnetic field on the electronic image is noted, and it is shown that the spectral resolution is improved by shielding the image tube.

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