Abstract The Main Stellar Spectrograph (MSS) of the 6-m telescope of the Special
Astrophysical Observatory was developed in the early 1970s and has been in permanent …

Results of the development and implementation of the Nasmyth Echelle Spectrograph (NES)
of the 6-m telescope of the Special AstrophysicalObservatory are presented. The NES is a …

We analyze the peculiarities of the optical spectra of luminous stars with circumstellar gas
and dust envelopes: the time variability of the absorption-emission profiles of the H α line …

Over the past two decades NES spectrograph attached to the 6-m telescope of the Special
Astrophysical Observatory of the Russian Academy of Sciences was used to perform …

Magnetic chemically peculiar stars of the main sequence can present rotational periods as
long as many decades. Here we report the results of an observational campaign started in …

A review of spectroscopic methods for observations of stars in searching for and studying
exoplanets is presented. Instrumental errors in measuring radial velocities and strategies to …

ABSTRACT A previously derived photometric parallax of 10.10±0.20 mas, d= 99±2 pc, is
confirmed for Polaris by a spectroscopic parallax derived using line ratios in high dispersion …

Based on the material of multiple high-resolution R= 60 000 observations conducted on the
6-m telescope (BTA) of the Special Astrophysical Observatory in combination with the …

The high resolution spectra of hydrogen-deficient binary υ Sgr are analyzed. The
atmospheric parameters are Teff= 12300±200 K, log g= 2: 5±0: 5 and ξt= 5-15 kms− 1 …

We succeeded in separating the absorption lines of both the primary C1 and the secondary
C2 component in the spectra of the young massive binary θ 1 OriC (O6Vp+ B0V, mass sum …