Progress toward a multiobject radial-velocity spectrometer

Details Progress toward a multiobject radial-velocity spectrometer Progress toward a multiobject radial-velocity spectrometer

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1686l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Dec. 1987, p. 1686-1693.

Physics

Optics

Fiber Optics, Radial Velocity, Research And Development, Spectrometers, Stellar Spectra, Cross Correlation, Spectrum Analysis, Stellar Magnitude, Stellar Spectrophotometry

Scientific paper

It is shown that it is possible to obtain stellar radial velocities of high accuracy using a fiber-fed echelle spectrograph with no cross disperser. Although the resulting spectrum contains many overlapping orders, the radial-velocity information is still present. Velocities may be obtained by cross correlation with reference data obtained with the same instrument. The accuracy is a function of the signal-to-noise ratio, and ranges from + or - 4 km/s to + or - 1 km/s. Velocities are obtained with exposure times just sufficient to obtain the barest trace of a spectrum using the same spectrograph and CCD detector with a cross disperser. Thus, it appears possible to obtain precision similar to that obtained with an order separator, but with considerably better sensitivity, due to a multiplexing gain. Moreover, the overlapping orders of the stellar spectrum only occupy a few rows of the CCD. Using a multiple-fiber-feed device, many such spectra could be fit on the CCD. This leads to the expectation of obtaining many radial velocities simultaneously using a multiobject spectrometer now under construction at Cerro Tololo.

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