The Fundamental Parameters and Evolutionary Status of V454 Aurigae

TL;DR

This study precisely determines the fundamental parameters, evolutionary status, and Galactic origin of the eclipsing binary V454 Aurigae using combined observational data, confirming its main sequence status and thin-disc membership.

Contribution

It provides updated stellar parameters, orbital ephemerides, and evolutionary insights for V454 Aur, integrating multiple data sources for comprehensive analysis.

Findings

Primary star: 1.173 M_, 1.203 R_, 6250 K

Secondary star: 1.045 M_, 0.993 R_, 5966 K

Distance matches Gaia data at 65.07 pc

Abstract

Eclipsing binary systems have a unique feature, which enables scientists to obtain precise fundamental star parameters, which opens to greater area of astrophysics studies. In this study, we have derived the fundamental parameters, the evolutionary status, and the birthplace of V454 Aur in the Galaxy by combining radial velocity, photometric, and spectral energy distribution data. We have updated ephemerides and period of V454 Aur as $2458850.80136_{-0.00001}^{\,+0.00001}$ and $27.0198177_{-0.0000003}^{\,+0.0000003}$, respectively. We obtain $1.173^{\,+0.016}_{-0.016}$ $M_\odot$ and $1.203^{\,+0.022}_{-0.026}$ $R_\odot$ for the primary component and $1.045^{\,+0.015}_{-0.014}$ $M_\odot$ and $0.993^{\,+0.034}_{-0.027}$ $R_\odot$ for the secondary component. The effective temperatures for the components are accurately determined via SED data as $6250^{\,+150}_{-150}$ K and $5966^{\,+109}_{-89}$ K for the primary component and the secondary component, respectively. The metallicity of the components is derived from evolutionary tracks, which implies slightly higher than Solar metallicity. According to analysis, the components of V454 Aur are on the main sequence. Our distance calculation for the system is, which is $65.07^{\,+2}_{-3}$ pc, in excellent agreement with \textit{Gaia} astrometric data, which is $65.07^{\,+0.09}_{-0.09}$ pc. The current age of the system is $1.19_{-0.09}^{\,+0.08}$ Gyr, and it will start to mass transfer between components in 5 Gyr from now on. Dynamical orbital analysis shows that V454 Aur follows a boxy pattern around the Galactic centre and is a member of the thin-disc component of the Galaxy. Considering the age and metallicity of this system, it was found to have formed just outside the Solar circle.