EAS Publications Series
Volume 63, 2013New Advances in Stellar Physics: From Microscopic to Macroscopic Processes
|Page(s)||35 - 45|
|Section||Key Observations for Stellar Modelling|
|Published online||19 December 2013|
G. Alecian, Y. Lebreton, O. Richard and G. Vauclair (eds)
EAS Publications Series, 63 (2013) 35–45
Axial Rotation and Turbulence of RR ab Stars: The Peterson Conundrum Revisited
1 Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA
2 Université Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, UMR 7293, Parc Valrose, 06108 Nice Cedex 02, France
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.
© EAS, EDP Sciences, 2013
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