Physical limits to attainable accuracies in stellar radial velocities

Details Physical limits to attainable accuracies in stellar radial velocities Physical limits to attainable accuracies in stellar radial velocities

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....43...45d&link_type=abstract

Astronomy and Astrophysics, vol. 43, no. 1, Sept. 1975, p. 45-50.

Astronomy and Astrophysics

Astrophysics

13

Radial Velocity, Red Shift, Stellar Spectra, Velocity Measurement, Absorption Spectra, Chromosphere, Convection, Line Spectra, Mathematical Models, Stellar Rotation, Velocity Distribution, Wavelengths

Scientific paper

It is shown that true stellar radial velocities cannot be obtained from spectral lines with a precision of better than 0.5 km/sec unless detailed knowledge of small-scale inhomogeneities in the line-formation region is available. Two models are calculated which demonstrate that convection-cell velocity patterns in particular cause line asymmetries and average wavelength shifts that depend critically on many unknown parameters and are likely to vary from star to star. It is suggested that more accurate radial velocities might be obtained from strong lines that form in layers above both the convection zone and the region of convective overshoot. The Na I D(1) line at 5896 A is recommended as the best line to use for this purpose, although it may be contaminated by chromospheric emission as well as circumstellar and interstellar absorption.

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