Progress toward a multiobject radial-velocity spectrometer

Abstract

view Abstract Citations References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Progress toward a multiobject radial-velocity spectrometer. Lutz, Thomas E. ; Ingerson, Thomas ; Weller, William G. Abstract 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. Publication: The Astronomical Journal Pub Date: December 1987 DOI: 10.1086/114603 Bibcode: 1987AJ.....94.1686L Keywords: Fiber Optics; Radial Velocity; Research And Development; Spectrometers; Stellar Spectra; Cross Correlation; Spectrum Analysis; Stellar Magnitude; Stellar Spectrophotometry; Instrumentation and Photography full text sources ADS | data products SIMBAD (17)