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Calculation of the local standard of rest from 20 574 local stars in the New Hipparcos Reduction with known radial velocities

Francis, Charles; Anderson, Erik

ContextAn accurate estimate of the local standard of rest (LSR) is required to determine key parameters used in approximate galactic mass models and to understand Galactic structure and evolution. However, authors are often forced to base dynamical analyses on potentially unreliable figures because recent determinations of the LSR have failed to r…

A W UMa type system from Southern Hemisphere: CN Hydri

Bakış, V.; Özkardeş, B.; Erdem, A.

We present an analysis of the Hipparcos photometry and the high-resolution ( {λ}/{Δλ}=41000) spectroscopy of the W UMa type system CN Hyi obtained in this study for the first time. The high resolution spectroscopic observations of the system were made at Mt. John University Observatory by using HERCULES fibre-fed échelle spectrograph in September …