Mode identification in the high-amplitude {\delta} Scuti star V2367 Cyg

TL;DR

This study combines multi-site photometry and spectroscopy to identify pulsation modes in the high-amplitude { extdelta} Scuti star V2367 Cyg, confirming previous mode identifications with detailed observational and modeling approaches.

Contribution

It introduces a comprehensive multi-site observational campaign and modeling method to accurately identify pulsation modes in V2367 Cyg, enhancing understanding of stellar oscillations.

Findings

Mode identifications support previous Kepler data analysis.

Combined photometry and spectroscopy effectively determine pulsation modes.

Results validate the use of model atmospheres and non-adiabatic models for mode identification.

Abstract

We report on a multi-site photometric campaign on the high-amplitude $\delta$ Scuti star V2367 Cyg in order to determine the pulsation modes. We also used high-dispersion spectroscopy to estimate the stellar parameters and projected rotational velocity. Time series multicolour photometry was obtained during a 98-d interval from five different sites. These data were used together with model atmospheres and non-adiabatic pulsation models to identify the spherical harmonic degree of the three independent frequencies of highest amplitude as well as the first two harmonics of the dominant mode. This was accomplished by matching the observed relative light amplitudes and phases in different wavebands with those computed by the models. In general, our results support the assumed mode identifications in a previous analysis of Kepler data.