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

  • G.W. Preston (a1) and M. Chadid (a2)

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.

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

  • G.W. Preston (a1) and M. Chadid (a2)

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