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- Title
AXIAL ROTATION AND TURBULENCE OF RR ab STARS: THE PETERSON CONUNDRUM REVISITED.
- Authors
Preston, G. W.; Chadid, M.
- 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 vaxiations 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.
- Subjects
VARIABLE stars; RR Lyrae stars; CEPHEIDS; MAXWELL equations; STELLAR oscillations; STELLAR spectra
- Publication
EAS Publications Series, 2013, Vol 63, p35
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1363004