Absolute properties of the neglected eclipsing B-type binary HD 194495

TL;DR

This study provides detailed physical properties and age estimates of the neglected eclipsing B-type binary HD 194495 through combined spectroscopic and photometric analysis, confirming stellar models with observational data.

Contribution

First comprehensive analysis of HD 194495 combining photometry and spectroscopy to determine its fundamental parameters and age.

Findings

Orbital period of 4.90494 days

Masses and radii of primary and secondary stars

System age estimated at over 28 million years

Abstract

We present the results of the high-resolution spectroscopic observations of the neglected binary system HD\,194495 (B3\,IV-V+B4\,V). A combined analysis of three different photometric data set ($Tycho$ B$_T$ and V$_T$ photometry, H$_p$-band data of $Hipparcos$ and $V-$band data of ASAS3 photometry) and radial velocities indicates that the system has an orbital period of 4.90494 $\pm$ 0.00005 days and an inclination of 69$\pm$1 degrees. This solution yields masses and radii of $M_{\rm 1}$ = 7.57$\pm$0.08 $M_{\odot}$ and $R_{\rm 1}$ = 5.82$\pm$0.03 $R_{\odot}$ for the primary and $M_{\rm 2}$ = 5.46$\pm$0.09 $M_{\odot}$ and $R_{\rm 2}$ = 3.14$\pm$0.08 $R_{\odot}$ for the secondary. Based on the position of the two stars plotted on a theoretical H-R diagram, we find that the age of the system is $\gtrsim$ 28 Myr, according to stellar evolutionary models. The spectroscopic and photometric results are in agreement with those obtained using theoretical predictions.