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The evolution status of HD 104237, ɛ Cha and HD 100546.

Hu, Jingyao; Shen, Chuanjian

Using the new data from Hipparcos and the TD-1 UV data, the authors fix the positions of three objects, HD 104237, HD 100546 and ɛ Cha in the HR diagram and discuss their theoretical evolutionary status.

Galactic kinematics derived from classical Cepheids.

Zhu, Zi

On the basis of radial velocity and Hipparcos proper motion data, the author has analyzed the galactic kinematics of classical Cepheids. Using the 3-D Ogorodnikov-Milne model he has determined the rotational velocity of the Galaxy to be V₀ = 240.5±10.2 km/s, on assuming a galactocentric distance of the Sun of R₀ = 8.5 kpc. Th…