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We analyze a sample of 82850 stars from the RAVE survey, with well-determined velocities and stellar parameters, to isolate a sample of 18026 high-probability thin-disc dwarfs within 600 pc of the Sun. We derive space motions for these…

The kinematic parameters identified from high-velocity stars situated within 100 kpc are examined and analyzed. We included three high velocity programs comprising 591, 87, and 519 stars as a function of distances ranging from 0.10 to…

Solar and Stellar Astrophysics · Physics 2025-01-23 W. H. Elsanhoury

We transformed radial velocities compiled from more than 1400 published sources, including the Geneva--Copenhagen survey of the solar neighborhood (CORAVEL-CfA), into a uniform system based on the radial velocities of 854 standard stars in…

Astrophysics · Physics 2019-10-25 Vadim V. Bobylev , George A. Gontcharov , Anisa T. Bajkova

We have studied the kinematic properties of young pre-main-sequence stars. We have selected these stars based on data from the Gaia DR2 catalogue by invoking a number of photometric infrared surveys. Using 4564 stars with parallax errors…

Astrophysics of Galaxies · Physics 2020-11-03 V. V. Bobylev , A. T. Bajkova

The spatial velocities of the stars with high-precision positions, proper motions and parallaxes from the Gaia TGAS catalog and line-of-sight velocities from the RAVE5 catalog are considered. From the sample of 92395 stars with the age…

Astrophysics of Galaxies · Physics 2017-12-20 V. V. Vityazev , A. S. Tsvetkov , V. V. Bobylev , A. T. Bajkova

We use about 200,000 FGK type main-sequence stars from the LAMOST DR1 data to map the local stellar kinematics. With the velocity de-projection technique, we are able to derive the averaged 3 dimensional velocity and velocity ellipsoids…

Astrophysics of Galaxies · Physics 2017-12-06 Hai-Jun Tian , Chao Liu , Jeffrey L. Carlin , Yong-Heng Zhao , Xue-Lei Chen , Yue Wu , Guang-Wei Li , Yong-Hui Hou , Yong Zhang

We analyse the kinematics of disc stars observed by the RAVE survey in and beyond the Solar neighbourhood.We detect significant overdensities in the velocity distributions using a technique based on the wavelet transform.We find that the…

We have analyzed the kinematics of OB stars from the list by Xiang et al. (2021) that contains $\sim$13 000 single OB stars. For these stars there are photometric distance estimates and proper motions from the Gaia catalogue and…

Astrophysics of Galaxies · Physics 2022-07-06 V. V. Bobylev , A. T. Bajkova , G. M. Karelin

Using a sample of 213,713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z|<1 kpc, we report the detection of a velocity gradient of disc stars in the fourth quadrant, directed…

The aim of the analysis of data from the Gaia Space Observatory is to obtain kinematic parameters of the collective motion of stars in a part of our galaxy. This research is based on a statistical analysis of the motion of {$55,038,539$}…

Astrophysics of Galaxies · Physics 2025-02-18 Petr Zavada , Karel Píška

The velocity distribution of stars in the Solar neighbourhood is inhomogeneous and rich with stellar streams and kinematic structures. These may retain important clues of the formation and dynamical history of the Milky Way. However, the…

Astrophysics of Galaxies · Physics 2017-12-13 Iryna Kushniruk , Thiebaut Schirmer , Thomas Bensby

The variations of kinematic parameters with age are considered for a sample of 15 402 thin-disk O--F stars with accurate $\alpha$, $\delta$, $\mu$, and $\pi>3$ mas from the Hipparcos catalogue and radial velocities from the PCRV catalogue.…

Solar and Stellar Astrophysics · Physics 2019-10-25 George Gontcharov

We have analyzed the kinematics of 9750 OB2 stars with proper motions and parallaxes selected by Xu et al. from the Gaia EDR3 catalogue. The relative parallax errors for these stars do not exceed 10\%. Based on the entire sample of stars,…

Astrophysics of Galaxies · Physics 2022-07-08 V. V. Bobylev , A. T. Bajkova

With the much enlarged stellar sample of 55831 stars and much increased precision in distances, proper motions, provided by Gaia DR1 TGAS we have shown with the help of the wavelet analysis that the velocity distribution of stars in the…

Astrophysics of Galaxies · Physics 2018-08-22 Iryna Kushniruk , Thiebaut Schirmer , Thomas Bensby

We use an improved wavelet analysis technique to reconstruct the $(U,V,W)$ velocity distribution for $\sim 250000$ stars from Gaia DR2, residing in the solar neighborhood of $200$~pc. The 2D wavelet transforms for three bivariate…

Solar and Stellar Astrophysics · Physics 2020-11-20 R. V. Baluev , V. Sh. Shaidulin , A. V. Veselova

We have selected and analyzed a sample of OB stars with known line-of-sight velocities determined through ground-based observations and with trigonometric parallaxes and proper motions from the Gaia DR2 catalogue. Some of the stars in our…

Astrophysics of Galaxies · Physics 2018-09-28 V. V. Bobylev , A. T. Bajkova

We present a new catalogue of 18 080 radial velocity standard stars selected from the APOGEE data. These RV standard stars are observed at least three times and have a median stability ($3\sigma_{\rm RV}$) around 240 m s$^{-1}$ over a time…

Solar and Stellar Astrophysics · Physics 2018-08-15 Yang Huang , Xiaowei Liu , Bingqiu Chen , Huawei Zhang , Haibo Yuan , Maosheng Xiang , Chun Wang , Zhijian Tian

We present the stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity), radial velocities, individual abundances and distances determined for 425 561 stars, which constitute the fourth public data…

We estimate the solar peculiar velocities and Oort constants using a sample of 5,627 A-type stars with $d<0.6\,\rm kpc$ and $|z|<0.1\,\rm kpc$, selected from the LAMOST surveys. The radial and tangential velocities of these A-type stars are…

Astrophysics of Galaxies · Physics 2021-03-31 F. Wang , H. -W. Zhang , Y. Huang , B. -Q. Chen , H. -F. Wang , C. Wang

The sample of classic Cepheids with known distances and line-of-sight velocities is supplemented by the proper motions from the Gaia DR1 catalog. From spatial velocities of 260 stars the components of the peculiar Solar velocity:…

Astrophysics of Galaxies · Physics 2023-05-31 V. V. Bobylev
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