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The Interstellar Ti II Distance Scale
Krełowski, J.; Galazutdinov, G. A.; Santander, T. A. +1 more
We measured the equivalent widths (
Precise Masses, Ages, and Orbital Parameters of the Binary Systems HIP 11352, HIP 70973, and HIP 72479
Al-Wardat, M. A.; Al-Tawalbeh, Y. M.; Hussein, A. M. +7 more
In this work, the orbital elements are improved and the total masses of the three close visual binary systems CVBSs: HIP 11352, HIP 70973, and HIP 72479 are precisely calculated. The calculations were performed based on an assessment of the latest Gaia DR2 and Hipparcos trigonometric parallax measurements. The morphology and kinematics of orbits a…
Physical and Dynamical Parameters of the Triple Stellar System: HIP 109951
Docobo, J. A.; Hussein, A. M.; Mardini, M. K. +5 more
The precise determination of the physical and dynamical parameters of the HIP 109951 triple star system (WDS J22161-0705AB) which is formed by the A, Ba, and Bb components are presented. The binary nature of component B was recently confirmed by studying the radial velocities. The analysis of the system follows Al-Wardat's complex method for analy…
On discovery of strong magnetic field in the binary system HD34736
Romanyuk, I. I.; Semenko, E. A.; Yakunin, I. A. +1 more
We present the results of a study of the star HD34736. The spectropolarimetric observations carried out at the 6-m telescope showed the presence of a strong variable longitudinal magnetic field, exceeding ‑4500 G. The analysis of the Hipparcos photometry gives a set of possible periods of the brightness variability of the star, of which
Physical and geometrical parameters of the binary system gliese 150.2
Al-Wardat, M. A.; Balega, Yu. Yu.; Leushin, V. V. +4 more
The speckle interferometric binary system Gl 150.2 (HIP17491) is analyzed using atmosphere modeling and dynamical analysis simultaneously. A synthetic spectral energy distribution (SED) for each of the two components of the system is built using Kurucz blanketed models. These SEDs are combined together to form the total flux, which is compared wit…
Speckle interferometry of nearby multiple stars. V. 2002–2006 positional measurements
Dyachenko, V. V.; Rastegaev, D. A.; Balega, Yu. Yu. +5 more
We present the measurements of positional parameters of 194 nearby binary stars performed at the 6-m BTA telescope of the SAO RAS from 2002 through 2006 applying the speckle interferometric technique. The observations were conducted at central filter wavelengths ranging from 545 to 800 nm using a speckle interferometer equipped with a fast CCD and…
Stars with discrepant v sin i as derived from the Ca II λ3933 Å and Mg II λ4481 Å lines. IV. HD8837—a shell star, HD47964 and HD183986—new binaries
Stateva, I.; Semenko, E.; Kudryavtsev, D. +4 more
Axial rotation of a star plays an important role in its evolution, physical conditions in its atmosphere, and appearance of its spectrum. We have analyzed CCD spectra of three stars for which their projected rotational velocity remarkably differs when derived from the Ca II λ 3933 Å and MgII λ 4481 Å lines. We derived effective temperatures and su…
Orbits of new Hipparcos binaries: III
Balega, Yu. Yu.; Balega, I. I.; Malogolovets, E. V.
We present apparent orbits and fundamental parameters of three pairs of early M-type dwarfs. The orbital elements are determined from speckle interferometric observations at the 6-m BTA telescope of the Special Astrophysical Observatory. The orbits of two pairs, HIP39402 and HIP 104565 are built for the first time. The orbit of HIP106972 is revise…
Kinematics of high proper motion stars determined from high resolution spectra in ground-based ultraviolet
Klochkova, V. G.; Tavolganskaya, N. S.
Radial velocities for 15 stars with high proper motions were measured as a result of spectral observations, conducted with the NES echelle spectrograph of the 6-m BTA telescope in the wavelength range of 3550–5100 Å with a spectral resolution of R=60000. The standard deviation of the measured velocity does not exceed σ ≤ 0.9 km/s for the stars wit…
Parameters of the visually close binary system Hip11253 (HD14874)
Al-Wardat, M. A.; Widyan, H.
The physical and geometrical parameters of the individual components of the binary system Hip11253 (HD14874) are estimated. We used the method described in previous papers, which consists in getting the best fit between the entire observational spectral energy distribution of the system and the synthetic ones, created from model atmospheres. The p…