Search Publications
Determination of the Parameters of a Nonlinear Kinematic Galactic Rotation Model Based on the Proper Motions and Radial Velocities of Stars from the Gaia DR3 Catalogue
Tsvetkov, A. S.; Amosov, F. A.
We have solved the Ogorodnikov-Milne stellar-kinematics equations in the Galactic rectangular coordinate system based on the total velocities for a special sample of stars with radial velocities from the final Gaia Data Release 3 catalogue. We have found the region of applicability of the linear model and the regions that it describes poorly. We h…
Frequency analysis of the hybrid δ Sct-γ Dor star CoRoT-102314644
Creevey, O. L.; Pichon, B.; Sánchez Arias, J. P. +1 more
Context. Observations from space missions allowed significant progress due to the absence of atmospheric noise contributions and having uninterrupted data sets. This has been extremely beneficial in asteroseismology because many oscillation frequencies, not observable from the ground, can be detected. One example of this success is the large numbe…
A Study of Eight Visual-spectroscopic Southern Binaries Using Recent SOAR Observations
Docobo, José A.; Campo, Pedro P.; Costa, Edgardo +2 more
Speckle observations performed between 2019 and 2022 with the HRCam attached to the 4.1 m SOAR telescope (Cerro Pachón, Chile) permitted to improve visual orbits of the southern binaries WDS 01243-0655 (BU 1163), WDS 09275-5806 (CHR 240), WDS 12114-1647 (S 643 AaAb), WDS 13317-0219 (HDS 1895), WDS 15282-0921 (BAG 25 AaAb), WDS 17304-0104 (STF 2173…
Water Ice Sublimation Distribution on the Surface of Short Period Comet
Liu, Can; Zhao, Yu-Hui; Ji, Jiang-Hui
Comets are the primitive planetesimals left in the solar system. Studying the evolution of comet nucleus is of great significance for understanding the formation and evolution history of other celestial bodies in the solar system. Under the action of solar radiation, the volatile components of comets sublimate and drive the dust movement, resultin…
Silica-Bearing Mounds and Strata in the Southwest Melas Basin, Valles Marineris, Mars: Evidence for a Hydrothermal Origin
Horgan, Briony H. N.; Rogers, Emma R.; Qualizza, Briar R. +2 more
A small basin on the Southwest (SW) margin of Melas Chasma in Valles Marineris, Mars, hosts a variety of previously identified sedimentary fans and layered strata hypothesized to have been formed by one or more paleolakes. This basin also contains light-toned layered mounds that have distinct spectral absorption bands consistent with amorphous hyd…
Minimum Noise Fraction Analysis of TGO/NOMAD LNO Channel High-Resolution Nadir Spectra of Mars
Vandaele, Ann Carine; Daerden, Frank; Ristic, Bojan +10 more
NOMAD is a suite of spectrometers on the board of the ESA-Roscosmos Trace Gas Orbiter (TGO) spacecraft and is capable of investigating the Martian environment at very high spectral resolution in the ultraviolet-visible and infrared spectral ranges by means of three separate channels: UVIS (0.2-0.65 µm), LNO (2.2-3.8 µm), and SO (2.3-4.…
A photometric study of NSVS 7453183: a probable quadruple system with long-term surface activity
Wolf, M.; Zejda, M.; Kučáková, H. +5 more
The VRC light curves were regularly measured for the eclipsing binary NSVS 7453183 as a part of our long-term observational project for studying of low-mass eclipsing binaries with a short orbital period and surface activity. The TESS light curve solution in PHOEBE results to the detached configuration, where the temperature of primary component w…
First photometric study of three eclipsing binary star systems: V495 Aur, V589 Aur and V478 Cam
Erdem, Ahmet; Öztürk, Oğuz
The light curve solutions and orbital period analysis of V495 Aur, V589 Aur and V478 Cam eclipsing binary star systems are presented for the first time in this study. Transiting Exoplanet Survey Satellite (TESS) observations were used as observational data. From the light curve solutions, it was concluded that all three systems are semi-detached b…
Quantitative Spectroscopic Analysis of O stars in the IACOB+OWN project: Massive stars in the Galaxy with GAIA-DR3
Simón-Díaz, S.; Holgado, G.
Massive stars are luminous beacons that help us to extract information about the star formation history and the chemodynamical evolution of galaxies in the Universe. Our Galaxy is full of massive stars, which expend their short-lived existence within bright star-forming regions, depositing huge amounts of mechanical and radiative energy to the int…
Optical Studies of Seven Bright Southern Cataclysmic Variable Stars
Thorstensen, John R.; Alvarado-Anderson, Chase K.; Burrows, Abigail D. +2 more
We report spectroscopic observations of seven bright southern cataclysmic variable stars, collected on a single two-week observing run using the 1.9 m Radcliffe telescope at the South African Astronomical Observatory. We used a radial-velocity time series, in some cases in combination with other data, to determine or clarify orbital periods for fi…