# Studying the age of supergiant companions in the magnetized X-ray binaries

## TL;DR

This paper explores how to use X-ray observations of neutron stars in high-mass X-ray binaries to estimate the age of supergiant companions, aiding in understanding stellar evolution and wind properties.

## Contribution

It presents a method to combine various X-ray observables to constrain the age of supergiant donors in HMXBs, improving insights into stellar evolution.

## Key findings

- Method to estimate donor age using X-ray data
- Constraints on stellar wind properties
- Implications for stellar evolution models

## Abstract

It has been proposed multiple times to use the neutron star (NS) in high-mass X-ray binaries (HMXBs) as an orbiting X-ray probe embedded in the wind-fed of its supergiant (SG) companion in order to constrain the stellar line-driven wind from the SG. We demonstrate how to combine various observables of HMXBs from the X-ray accretion luminosity produced by the wind-fed NS, in order to estimate and constrain the age of the donors. This would help us to study the stellar evolution track for each donor model. Since the evolution of massive stars is essentially determined by mass loss, and direct measures of mass-loss rates suffer from important uncertainties due to the unknown micro-structure of the wind.