Mode Discrimination in ? Cephei Stars

Authors:
Publisher website
Google Scholar
Abstract
In an extension of previous work, we have compared observed 3 Cephei star light ranges [Δm(λ)] with model predictions, to assist in discriminating between proposed oscillation modes for their surfaces. Specifically we have considered the radial model and the non-radial form studied by Osaki (1971). Stars with published Δm(λ) extending from the satellite ultraviolet up to the visual were examined. For all eight singly-periodic stars examined, and for the line-broadening mode of a Sco, the Δm(λ) are only consistent with the radial model. An excellent model fit is achieved when the data are of uniformly high quality, as is the case for ξ’ CMa, BW Vul and β Cep. For the line-broadening modes of β CMa and 12 Lac, the visual data indicate that Δm(λ) depends only weakly on wavelength. These modes are not consistent with the radial interpretation and require an alternate explanation. They are consistent with the non-radial form of Osaki.

This publication has 7 references indexed in Scilit: