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±0.00005days and an inclination of 69±1 degrees. This solution yields masses and radii of M 1 =7.57±0.08 M ⊙ and R 1 =5.82±0.03 R ⊙ for the primary and M 2 =5.46±0.09 M ⊙ and R 2 =3.14±0.08 R ⊙ 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 ≳28Myr, according to stellar evolutionary models. The spectroscopic and photometric results are in agreement with those obtained using theoretical predictions. [Copyright &y& Elsevier]