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Revisiting the Local Kinematics of the Milky Way using the New Hipparcos Data
Zhu, Zi; Yuan, Fang-Ting; Kong, Da-Li
With the new Hipparcos data recently released, we reexamine the kinematics in the solar neighborhood. Two different populations of objects, namely the thin-disk O-B5 stars and the thick-disk K-M giants, are selected for tracing the kinematical parameters of the Galaxy. Using a 3-D kinematical model, the components of the solar motion and the Oort …
Velocity Space of Galactic O-B Stars
Zhu, Zi
Based on the Hipparcos proper motions and available radial velocity data of O-B stars, we have re-examined the local kinematical structure of the young disk population of ~1500 O-B stars not including the Gould-belt stars. A systematic warping motion of the stars about the direction to the Galactic center has been reconfirmed. A negative K-term im…
The Status of ROSAT X-ray Active Young Stars toward Taurus-Auriga
Li, Jin-Zeng
We present an astrometric study of the candidates of T Tauri stars (TTS) and non-TTS X-ray sources around Tau-Aur, based on the Hipparcos Catalogue and the ACT Reference Catalogue. The ROSAT selected X-ray sources are found to be a mixed population. A few of them are associated with the Tau-Aur or Orion Star Forming Regions (SFR). Some, with dista…
Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy
Chen, Li; Wang, Jia-Ji; Wu, Zhen-Yu
We examine 14 plates of the globular cluster M3 (NGC 5272) taken with the 40 cm refractor at the Sheshan station of Shanghai Astronomical Observatory. The plates span over a period of about 77 years. The positions and absolute proper motions of eight stars in the Hipparcos Catalogue and of 49 stars in the Tycho-2 Catalogue are used as the referenc…
Information from the Kinematics of F and G Stars in the Solar Neighborhood
Zhao, Gang; Shi, Jian-Rong; Chen, Yu-Qin
We have calculated the orbital parameters for 90 stars in Chen et al. and updated the kinematic data for stars in Edvardsson et al. by using the accurate Hipparcos parallaxes and proper motions, and recalculated the α-element abundances in Edvardsson et al. in a way consistent with Chen et al. The two sets of data are combined in a study of stella…