Spectroscopic Pulsational Frequency and Mode Determination of the ${\hat{I}}^3$ Doradus Star HD 189631

Abstract

We present improvement and confirmation of identified frequencies and pulsation modes for the ${\hat{I}}^3$ Doradus star HD 189631. This work improves upon previous studies by incorporating a significant number of additional spectra and precise determination of frequencies. Four frequencies were identified for this star: $1.6774\pm 0.0002$ d${}^{-1}$, $1.4174\pm 0.0002$ d${}^{-1}$, $0.0714\pm 0.0002$ d${}^{-1}$, and $1.8228\pm 0.0002$ d${}^{-1}$ which were identified with the modes ($l$,$m$) = ($1,+1$), ($1,+1$), ($2,-2$), and ($1,+1$) respectively. These findings are in agreement with the most recent literature. The prevalence of ($l$,$m$) = ($1,+1$) modes in ${\hat{I}}^3$ Doradus stars is starting to become apparent and we discuss this result.

Accepted in PASA, 7 Apr 2014