RAT0455+1305: another pulsating hybrid sdB star

TL;DR

This paper reports the discovery and analysis of RAT0455+1305, a hybrid pulsating sdB star exhibiting both p- and g-modes, confirmed through Fourier analysis of photometric data, expanding understanding of such stellar objects.

Contribution

First detailed photometric study confirming RAT0455+1305 as a hybrid sdBV star with multiple pulsation modes, similar to Balloon 090100001.

Findings

Identification of dominant pulsation mode.

Detection of additional close peaks indicating multiple modes.

Evidence of hybrid p- and g-mode pulsations.

Abstract

RAT0455+1305 was discovered during the Rapid Temporal Survey which aims in finding any variability on timescales of a few minutes to several hours. The star was found to be another sdBV star with one high amplitude mode and relatively long period. These features along with estimation of T_eff and log g makes this star very similar to Balloon 090100001. Encouraged by prominent results obtained for the latter star we have decided to perform white light photometry on RAT0455+1305. In 2009 we used the 1.5m telescope located in San Pedro Martir Observatory in Mexico. Fourier analysis confirmed the dominant mode found in the discovery data, uncovered another peak close to the dominant one, and three peaks in the low frequency region. This shows that RAT0455+1305 is another hybrid sdBV star pulsating in both p- and g-modes.