Photometry of GSC 762-110, a new triple-mode radially pulsating star

TL;DR

This paper reports the discovery and analysis of GSC 762-110, a rare triple-mode radial pulsating star, providing precise period measurements that can help constrain stellar models.

Contribution

It presents the identification of a new triple-mode radial pulsator and detailed photometric analysis, expanding the limited known examples of such stars.

Findings

GSC 762-110 is a triple-mode radial pulsator with specific period ratios.

Two non-radial modes were detected with decreasing amplitudes.

The star's fundamental period is 0.1945 days.

Abstract

Stars pulsating in three radial modes are very rare; only three examples are known in the Galaxy. These stars are very useful since their periods may be measured very precisely, and this will constrain the global stellar parameters and the models of the star's interior. The purpose of this paper is to present a new example of the class of triple-mode radial pulsators. A search for candidate multi-mode pulsators was carried out in public survey data. Time-series photometry of one of the candidates, GSC 762-110, was performed. GSC 762-110 was found to be a triple-mode radial pulsator, with a fundamental period of 0.1945d and period ratios of 0.7641 and 0.8012. In addition two non-radial modes were found, for which the amplitude has diminished considerably over the last few years.