Mode identification for Balloon 090100001 using combined multicolour photometry and spectroscopy

TL;DR

This study demonstrates that combining multicolour photometry and spectroscopy effectively identifies pulsation modes in the subdwarf B star Balloon 090100001, aiding internal structure analysis through seismic methods.

Contribution

The paper introduces a successful combined photometry and spectroscopy method for mode identification in pulsating stars, confirming mode characteristics and enabling internal structure constraints.

Findings

Dominant mode is radial.

Method yields consistent l values with observed triplet.

Radius variation of 1.7% for the dominant mode.

Abstract

In this paper, we show that method of mode identification using combined multicolour photometry and spectroscopy can be successfully applied to the pulsating subdwarf B star Balloon 090100001. The method constrains the spherical degree, l.We confirm that the dominant mode is radial and we show that for some other modes the method provides values of l consistent with the observed rotationally split triplet. Moreover, we derive a radius variation of 1.7 per cent for the dominant mode. The identification opens the possibility for constraining the internal structure of the star by means of seismic methods.