Spectroscopy of {\epsilon} Aurigae during the 2009-2011 eclipse

TL;DR

This study presents spectral observations of the eclipsing system { extbackslash epsilon} Aurigae during its 2009-2011 eclipse, analyzing line variations to understand the circumstellar disk and estimate system masses.

Contribution

It provides new spectral data during the eclipse and compares it with past observations to assess disk stability and refine mass estimates.

Findings

Spectral line variations traced at different eclipse phases.

Good agreement with previous eclipse data, indicating disk stability.

New mass estimations for the system components.

Abstract

The results of the spectral observations of a unique eclipsing system {\epsilon} Aurigae obtained during the recent eclipse are presented. We traced the spectral lines variations at different eclipse phases. The part of these changes is the result of the absorption of stellar radiation by the gas component of circumstellar (CS) disk around the secondary. The other part arises due to the obscuration of the stellar photosphere and the closest circumstellar area by the dusty CS disk. Comparison of our results with the previous one, obtained by Lambert & Sawyer during the 1982-1984 eclipse, indicates the good agreement, and argues in favor of stability of the secondary disk structure. On the base of the new observational data we provide a new mass estimation of the system components.