Hostname: page-component-5c6d5d7d68-sv6ng Total loading time: 0 Render date: 2024-08-20T15:09:25.765Z Has data issue: false hasContentIssue false
  • English
  • Français

Minimizing Radial-velocity Errors caused by Spectral-type Mismatch in Early-type Stars

Published online by Cambridge University Press:  12 April 2016

Werner Verschueren ,
Marc David  and
Myriam Vrancken
Werner Verschueren
Affiliation:
University of Antwerp (RUCA), Astrophysics Research Group, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
Marc David
Affiliation:
University of Antwerp (RUCA), Astrophysics Research Group, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
Myriam Vrancken
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel, Belgium

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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

References

David, M. & Verschueren, W. 1995, A&A Suppl. 111, 183 Google Scholar
Fekel, F. 1998, this meetingGoogle Scholar
Hubeny, I., Lanz, T. & Jefferey, C.S. 1994, Newsl. Anal. Astron. Sp. 20, 30 Google Scholar
Kurucz, R.L. 1993, S.A.O. CD-ROM 13Google Scholar
Latham, D.W. & Stefanik, R.P. 1992, Trans. IAU, Vol. XXIB, 269 Google Scholar
Verschueren, W. 1991, Ph.D. Thesis, Free University of Brussels (VUB), Belgium Google Scholar
Verschueren, W. 1995, Standard Star Newsletter 18, 6 Google Scholar
Verschueren, W. & David, M. 1998, A&A, submittedGoogle Scholar