J08069+1527: A newly discovered high amplitude, hybrid subdwarf B pulsator

TL;DR

This paper reports the discovery and analysis of a new high amplitude, hybrid pulsating subdwarf B star, J08069+1527, which exhibits both high and low frequency pulsation modes, enriching the understanding of such stellar objects.

Contribution

The study introduces the first detailed analysis of J08069+1527, a newly discovered hybrid subdwarf B pulsator, highlighting its pulsation characteristics and potential for stellar modeling.

Findings

Detected high and low frequency pulsation modes

Identified high amplitude dominant mode

Spectroscopic confirmation of pulsation features

Abstract

We present our discovery of a new hybrid pulsating subdwarf B star, J08069+1527. The effective temperature and surface gravity of 28,500$\pm$400\,K and 5.37$\pm$0.04\,dex, respectively, place this object inside the instability strip and also among other pulsating hot subdwarfs of a hybrid nature, right next to another fascinating star: Balloon\,090100001. From this proximity, we anticipated this star could pulsate in both high and low frequency modes. Indeed, our analysis of photometric data confirmed our prediction. We detected two peaks in the high frequency region and two other peaks at low frequencies. In addition, the amplitude of the dominant mode is very high and comparable to the dominant peaks in other hybrid subdwarf B stars. Since this star is bright, we performed time-series low resolution spectroscopy. Despite a low signal-to-noise (S/N) ratio, we were able to detect the main peak from these data. All our results strongly indicate that J08069+1527 is a high amplitude pulsating hot subdwarf B star of hybrid nature. By analogy to the other pulsating sdB star, we judge that the dominant mode we detected here has radial nature. Future stellar modeling should provide us with quite good constrains as p- and g-modes presented in this star are driven in different parts of its interior.