Study of Bubble Nebula using IUE high resolution Spectra

TL;DR

This study analyzes high-resolution spectra of the Bubble Nebula's central star to understand its velocity structure and age discrepancy, revealing insights into nebula expansion and stellar wind mechanics.

Contribution

It provides the first detailed spectral analysis of the Bubble Nebula's central star, highlighting the age difference and possible expansion mechanisms.

Findings

The Bubble Nebula is significantly younger than its central star.

Velocity measurements suggest inhomogeneous interstellar medium influence.

The mechanics of stellar wind may be not fully understood.

Abstract

In this paper we have analyzed IUE high resolution spectra of the central star (BD+602522) of the Bubble nebula. We discuss velocities of the different regions along the line of sight to the bubble. We find that the Bubble Nebula is younger (by a factor of 100) than the exciting star suggesting that either the bubble is expanding into an inhomogenuous interstellar medium or that the mechanics of the stellar wind are not fully understood.