Search Publications
A kinematic study of the Galaxy
Liu, Yu; Ma, Wen-zhang
Using the proper motion and parallax data for 1011 O-B stars in the Hipparcos Catalogue we have derived the Oort constants, A = 17.60 ± 0.21 (km/s)/kpc, B = -14.62 ± 0.20 (km/s)/kpc, and a solar velocity V⊙ = 16.7 ± 0.10 km/s in the direction l⊙ = 45.3° ± 2.8°, b⊙ = 21.0° ± 2.3°. For a galactocentric distance of th…
Galactic kinematics derived from classical cepheids
Zhu, Zi
On the basis of radial velocity and Hipparcos proper motion data, we have analyzed the galactic kinematics of classical Cepheids. Using the 3-D Ogorodnikov-Milne model we have determined the rotational velocity of the Galaxy to be V0 = 240.5 ± 10.2 km/s, on assuming a glactocentric distance of the Sun of R0 = 8.5 kpc. The res…
The evolutionary status of HD 104237, ɛ Cha and HD 100546
Hu, Jing-yao; Shen, Chuan-jian
Using the new data from Hipparcos and the TD-1 UV data, we fix the positions of three objects, HD 104237, HD 100546 and ɛ Cha in the HR diagram and discuss their theoretical evolutionary status.