Complex asteroseismology of the Slowly Pulsating B-type star HD74560

TL;DR

This paper conducts complex seismic modeling of the SPB star HD74560, identifying pulsation modes and the complex nonadiabatic parameter, and examines the effects of chemical composition and opacity data on stellar models.

Contribution

It provides the first detailed seismic analysis of HD74560, including mode identification and empirical parameter derivation, highlighting differences from more massive pulsating stars.

Findings

Identified pulsation mode degrees for five frequencies.

Derived empirical complex nonadiabatic parameters for two frequencies.

Showed significant differences in seismic properties between SPB and $eta$ Cephei stars.

Abstract

We present the results of complex seismic modelling of the Slowly Pulsating B-type star HD74560. The star pulsates in five frequencies detected in photometric observations. For all these frequencies, we identify the mode degree, $\ell$. For two of them, found also in spectroscopic data, we are able to derived the empirical values of the complex nonadiabatic parameter $f$. We test effects of chemical composition and opacity data. Our results show that the properties of seismic models of SPB stars differ significantly from those of the more massive $\beta$ Cephei stars.