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

摘要

Stars pulsating in three radial modes are very rare; only three examples areknown in the Galaxy. These stars are very useful since their periods may bemeasured very precisely, and this will constrain the global stellar parametersand the models of the star's interior. The purpose of this paper is to presenta new example of the class of triple-mode radial pulsators. A search forcandidate 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 fundamentalperiod of 0.1945d and period ratios of 0.7641 and 0.8012. In addition twonon-radial modes were found, for which the amplitude has diminishedconsiderably over the last few years.