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

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 $M_1$ = 7.57$\pm$0.08 $M_{\odot }$ and $R_1$ = 5.82$\pm$0.03 $R_{\odot }$ for the primary and $M_2$ = 5.46$\pm$0.09 $M_{\odot }$ and $R_2$ = 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.

17 pages, 5 figures, 5 tables; New Astronomy, 2011

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