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1999•International Astronomical Union ColloquiumOpen access

Limitations of Precise Radial Velocity Measurements in Pulsating Stellar Atmospheres

J. Vinkó, G. Kaszás, L. L. Kiss

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Abstract

Abstract We study the velocities of specific stellar absorption lines of Cepheid-type variable stars determining line bisector velocities from newly obtained high-resolution echelle spectra. We compare these velocities with recent CORAVEL measurements of Cepheids to reveal systematic differences of 2 – 3 kms−1.

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Abstract We study the velocities of specific stellar absorption lines of Cepheid-type variable stars determining line bisector velocities from newly obtained high-resolution echelle spectra. We compare these velocities with recent CORAVEL measurements of Cepheids to reveal systematic differences of 2 – 3 kms−1.

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Available abstract

Abstract We study the velocities of specific stellar absorption lines of Cepheid-type variable stars determining line bisector velocities from newly obtained high-resolution echelle spectra. We compare these velocities with recent CORAVEL measurements of Cepheids to reveal systematic differences of 2 – 3 kms−1.

Key concepts: Cepheid variable, Radial velocity, Astrophysics, Physics, Stars, Spectral line, Line (geometry), Stellar atmosphere

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