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Axial Rotation and Turbulence of RR ab Stars: The Peterson Conundrum Revisited

Published online by Cambridge University Press:  19 December 2013

G.W. Preston  and
M. Chadid
G.W. Preston
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
M. Chadid
Affiliation:
Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, UMR 7293, Parc Valrose, 06108 Nice Cedex 02, France
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Abstract

We calibrate and then use the relation between equivalent width (EW) and full–width–half–maximum (FWHM) of metallic absorption lines in the spectra of RR Lyrae stars to estimate a new upper limit of Vrotsini ≤ 6 km.s−1 on their axial equatorial rotational velocities, and to derive the variations of macroturbulent velocities in their atmospheres during pulsation cycles. Finally, we present a simple way to estimate macroturbulent/rotational velocity from FWHM of the cross–correlation function.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 35 - 45
Copyright
© EAS, EDP Sciences, 2013

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