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1996PASP..108..500B - Publ. Astron. Soc. Pac., 108, 500-509 (1996/June-0)
Attaining doppler precision of 3 m s-1.
BUTLER R.P., MARCY G.W., WILLIAMS E., McCARTHY C., DOSANJH P. and VOGT S.S.
Abstract (from CDS):
We construct a model of each observed spectrum by multiplying a stellar spectrum with an iodine spectrum and convolving the result with the spectrometer PSF. The free parameters of the model include the wavelength scale, spectrometer PSF, and stellar Doppler shift. All model parameters are derived anew for each exposure and the synthesis is done on a grid of CCD sub-pixels, using spline functions as interpolation predictors. We present Doppler tests of the Sun, Tau Ceti, and 107 Psc, observed with the Lick and Keck echelles. All exhibit apparent errors of about 3 m s^-1, maintained on time scales of minutes to a year. This precision agrees with the theoretically predicted errors that stem primarily from photon statistics.
Abstract Copyright: ∼
Journal keyword(s): Astronomical Instrumentation
Simbad objects: 3
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