DOPPLER TOMOGRAPHY OF THE STAR IRAS 20090 + 3809 WITH B[e] PHENOMENON.

Abstract

In this paper, the object of study is IRAS 20090 + 3809 (V ~ 10.9 mag), a northern
hemisphere star in the constellation Cygnus (l = 75 ° .3, b = + 2 ° .6). The fundamental parameters
of the IRAS 20090 + 3809 system are Teff = 11000 ± 500 K, projection velocity Vi = 31 ± 3 km / s,
interstellar absorption AV = 0.50 ± 0.02 mag, distance to the star D = 2.4 ± 0.1 kpc, and luminosity
log L / Lʘ = 3.5 ± 0.1, orbital period Porb = 131.290 ± 0.080 days.
In this work, we studied the profiles of the Hα and Fe II lines of the IRAS star 20090 + 3800
using Doppler tomography. To study the spectral profiles, 25 observations were obtained with a
high resolution of R = 18,000-65,000. High-resolution spectroscopic observations of the star IRAS
20090 + 3809 were obtained with the 2.7-meter McDonald Observatory telescope (Texas, USA)
and the 2.1-meter ObservatorioAstronómicoNacional San Pedro Martir telescope (OAN SPM, Baja
California, Mexico).
The paper presents Doppler maps of the location of circumstellar gas in a binary system, re-
constructed from tomography for the Fe II 6431 Å and Hα lines. As a result, Doppler imaging
showed that the sources of emission lines are distributed in the region around the B-star, between
the components of the system and in the disk located around the entire system.