Photoelectric stellar radial velocity measurements with an echelle spectrometer

Details Photoelectric stellar radial velocity measurements with an echelle spectrometer Photoelectric stellar radial velocity measurements with an echelle spectrometer

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977obs....97....5h&link_type=abstract

The Observatory, vol. 97, Feb. 1977, p. 5-9.

Physics

4

Echelle Gratings, Radial Velocity, Spectrometers, Stellar Rotation, Stellar Spectrophotometry, Doppler Effect, Instrument Errors, Velocity Measurement

Scientific paper

This note shows that an echelle grating offers considerable advantages over a conventional grating in the photoelectric measurement of stellar radial velocities. Undesirable features of the Griffin (1967) spectrometer are discussed which arise due to restricted wavelength range and mismatch between stellar absorption lines and diaphragm apertures, and it is demonstrated how all these shortcomings can be reduced or overcome by using an echelle grating. Means are considered for minimizing the problem with an echelle photoelectric spectrograph that results from the change in angular dispersion through one spectral order.

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