On the nature of HD 207331: a new Delta Scuti variable

TL;DR

This paper reports the discovery of HD 207331 as a new Delta Scuti variable star, identified through photometric observations and period analysis revealing a dominant pulsation mode.

Contribution

It is the first to identify HD 207331 as a Delta Scuti variable using uvby differential photometry and period analysis.

Findings

HD 207331 exhibits a dominant pulsation at 21.1 c/d

The pulsation amplitude is approximately 6 mmag

Confirmed variability through CCD photometry

Abstract

While testing a Stromgren spectrophotometer attached to the 1.5-m telescope at the San Pedro Martir observatory, Mexico, a number of A-type stars were observed, one of which, HD 207331, presented clear indications of photometric variability. CCD photometric data acquired soon after, confirmed its variability. In order to determine its pulsation behaviour more accurately, uvby differential photoelectric photometry was carried out for three nights. As a result of the period analysis of the light curves we have found a dominant pulsation mode at 21.1 c/d with an amplitude of 6 mmag. This strongly suggests that HD 207331 is a new Delta Scuti-type pulsating star.