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Minimizing Radial-velocity Errors caused by Spectral-type Mismatch in Early-type Stars
Published online by Cambridge University Press: 12 April 2016
Abstract
We present the first results of a long-term study to increase the external accuracy of (relative and absolute) radial velocities of early-type stars below the 1 km/s level. The accuracy suffers mainly from important systematic errors caused by intrinsic object-template mismatch in cross-correlation. Based on synthetic spectra, the magnitude of these mismatch errors is shown in different spectral regions and for different rotational velocities around spectral-type mid-A. A line selection and combination scheme is proposed which optimizes the accuracy (systematic errors) in view of the precision (random errors) required.
- Type
- Part 2. Fundamental Concepts and Techniques
- Information
- International Astronomical Union Colloquium , Volume 170: Precise Stellar Radial Velocities , 1999 , pp. 108 - 112
- Copyright
- Copyright © Astronomical Society of the Pacific 1999
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