4 papers · 1 filter
On the nature of HD 207331: a new Delta Scuti variable
L. Fox Machado, W. J. Schuster, C. Zurita +2
While testing a Stromgren spectrophotometer attached to the 1.5-m telescope at the San Pedro Martir observatory, Mexico, a number of A-type stars were observed, one of which, HD 20…
uvby-βphotometry of high-velocity and metal-poor stars XI. Ages of halo and old disk stars
W. J. Schuster, A. Moitinho, A. Marquez +2
New uvby-βdata are provided for 442 high-velocity and metal-poor stars; 90 of these stars have been observed previously by us, and 352 are new. When combined with our previous two…
Kinematics, ages and metallicities for F and G type stars in the solar neighbourhood
Y. Karatas, S. Bilir, W. J. Schuster
A new metallicity distribution and an age-metallicity relation are presented for 437 nearby F and G turn-off and sub-giant stars selected from radial velocity data of Nidever et al…
Sc and Mn abundances in disk and metal-rich halo stars
P. E. Nissen, Y. Q. Chen, W. J. Schuster +1
Sc and Mn abundances are determined for 119 F and G main-sequence stars with -1.4 < [Fe/H] < +0.1, representing stars from the thin disk, the thick disk and the halo. The results i…