7 papers · 1 filter
Magnetic fields of B and Herbig Ae stars measured with FORS1 at the VLT
S. Hubrig, T. Szeifert, P. North +2
We present the results of a magnetic survey with FORS1 in polarimetric mode of a sample of B and Herbig Ae stars with previously undetected magnetic fields. For the first time a me…
Chemical abundances in seven red giants of NGC 2360 and NGC 2447
S. Hamdani, P. North, N. Mowlavi +2
Chemical abundances of about fifteen elements from oxygen to europium are measured in seven red giants of the two open clusters NGC 2360 and NGC 2447. The effective temperatures of…
The evolutionary state and fundamental parameters of metallic A-F giants
P. North, D. Erspamer, M. Kuenzli
Using Hipparcos parallaxes, we show that the metallic A-F giants found by Hauck (1986) on the basis of their high Delta m_2 index in Geneva photometry are on average more evolved t…
Magnetic Bp and Ap stars in the H-R diagram
S. Hubrig, P. North, G. Mathys
The positions in the H-R diagram of strongly magnetic Ap and Bp stars are compared with those of normal main sequence stars of types B7 to F2, with a view to investigating possible…
Absolute magnitudes and kinematics of CP stars from Hipparcos data
A. E. Gomez, X. Luri, V. Sabas +5
The position in the HR diagram and the kinematic characteristics of different kinds of CP stars of the upper main sequence are obtained using the LM method (Luri et al., 1996). Mos…
Binaries among Ap and Am stars
P. North, N. Ginestet, J. -M. Carquillat +2
The results of long-term surveys of radial velocities of cool Ap and Am stars are presented. There are two samples, one of about 100 Ap stars and the other of 86 Am stars. Both hav…