Spectroscopy of roAp star pulsation: HD24712
Abstract
We present results of the radial velocity (RV) analysis of spectroscopic time-series observations of the roAp star HD24712 (HR1217) which were carried out simultaneously with the Canadian MOST mini-satellite photometry. Only lines of the rare-earth elements (REE) show substantial amplitudes of RV pulsations. Based on new Zeeman measurements we found different shapes of the magnetic curves derived by using Fe-peak and REE separately. Frequency analysis of the spectroscopic data showed that the highest amplitude frequencies are the same in photometry and spectroscopy. Photometric and spectroscopic pulsation curves are shifted in phase, and the phase shift depends on the atomic species. The observed distribution of RV pulsation amplitudes and phases with the optical depth as well as the observed phase lag between luminosity and radius variations are explained satisfactorily by the model of nonadiabatic nonradial pulsations of a magnetic star.
Keywords
Cite
@article{arxiv.astro-ph/0509748,
title = {Spectroscopy of roAp star pulsation: HD24712},
author = {M. Sachkov and T. Ryabchikova and S. Bagnulo and I. Ilyin and T. Kallinger and O. Kochukhov and F. Leone and G. Lo Curto and T. Lüftinger and D. Lyashko and A. Magazzu and H. Saio and W. W. Weiss},
journal= {arXiv preprint arXiv:astro-ph/0509748},
year = {2016}
}
Comments
4 pages, 3 figures