THE SPECTRAL CHANGES OF THE STAR IRAS 20090+3809

Abstract

In this paper is devoted to the study of an object with the phenomenon B[e], in the
spectrum of which there are forbidden emission lines, stars IRAS 20090+3809, with a magnitude
V~11.0 mag, located in the constellation Cygnus (l=75°.3, b=+2°.6). From the analysis of
absorption lines in the IRAS 20090+3809 star spectrum, the optical spectrum shows the presence of
a b-type star with an effective temperature of Teff=11,000±500K. Was discovered regular
variations of the radial velocity of the absorption lines and emission, with the following orbital
parameters: Porb=13.274±0.090 days, a zero phase which is equal to the (component B is in a superb
connection) JD0=JD 2,455,025.6±1.5, poluamiidist curve RV (radial velocity) K1=51.7±3.0 km s-1,
and a systemic velocity γ=-31.8±2.6 km s-1. Periodic radial variations in the rate of absorption lines
in the spectrum of the star IRAS 20090+3809 indicate its binary character. In our twenty-seven
optical spectra of high resolution (3600-10,500 Å) IRAS 20090+3809 with a spectral resolution of
R=18,000-65,000 and an average signal / noise ratio of ∼100 in the period from November 2009 to
November 2017, no trace of the secondary component was detected.