Two-site CCD observations and spectroscopy of HD 207331: a new $\delta$ Scuti variable in Cygnus

TL;DR

This study reports detailed photometric and spectroscopic observations of the new delta Scuti star HD 207331, identifying multiple pulsation frequencies and characterizing its spectral and rotational properties.

Contribution

It provides the first multi-site photometric detection of four pulsation frequencies and spectroscopic analysis of HD 207331, confirming its multiperiodic delta Scuti nature.

Findings

Four pulsation frequencies identified with >99% confidence

Spectroscopic analysis determined spectral type and rotation rate

Confirmed multiperiodic pulsation behavior

Abstract

The results of an observational campaign on the new $\delta$ Scuti pulsator \astrobj{HD~207331} are reported. The star was observed photometrically from August 26 to September 2, 2009 from the Observatorio San Pedro M\'artir (0.84-m telescope, Mexico) and the Observatorio del Teide (0.80-m telescope, Spain). An overall run of 53.8 h of useful data was collected from the two sites. Four oscillation frequencies for \astrobj{HD~207331} have been found above a 99\% confidence level. These results confirm the multiperiodic pulsation nature of the star suggested in previous observations with sparse data. Spectroscopic observations carried out in 2009 allowed us to derive its spectral type and luminosity class as well as to estimate its rotation rate. A simple comparison with models is performed.