Towards Asteroseismology of PG1605+072

TL;DR

This paper investigates the pulsation modes of the star PG1605+072 using extensive time-resolved spectroscopy to analyze line profile variations and derive atmospheric parameters, aiming to advance asteroseismology of this star.

Contribution

It introduces a spectroscopic approach combined with theoretical modeling to characterize pulsation modes in PG1605+072, providing new constraints on its oscillation properties.

Findings

Detected line profile variations from 9000 spectra.

Derived temperature and gravity variations with phase.

Constrained pulsation mode degrees and orders.

Abstract

We present our attempt to characterise the frequency spectrum of the bright V 361 Hya star PG1605$+$072 from atmospheric parameter and radial velocity variations through a spectroscopic approach. Therefore we used time resolved spectroscopy ($\approx$9000 spectra) to detect line profile variations from which variations of the effective temperature and gravity, together with their phases, are extracted by means of a quantitative spectral analysis. The theoretical modelling of adequate pulsation modes with the \textit{BRUCE} and \textit{KYLE} codes allows to derive constraints on the mode's degree and order from the observed frequencies.