The magnetohydrodynamic (MHD) normal modes of oscillation of sheared coronal arcades including longitudinal wave propagation are studied. Solutions have been computed in order to ascertain the effects of the longitudinal magnetic field component, By, and of the longitudinal propagation, ky in these structures. Our results show that whenever By = 0

IAUC 8270 available at Central Bureau for Astronomical Telegrams.

In this paper we use the SoHO/VIRGO three colour time series data to investigate how colour correlated stellar signal and noise may be used to improve the S/N of the Eddington time series. We conclude that one may implement a two-colour system on Eddington in order to reduce the amount of noise at low frequencies. We propose a blue and a red broad

The choice of transit detection algorithm can have a strong influence on the results of any photometric exoplanet search. This paper outlines a technique by which the different algorithms can be compared, performing this comparison for the simple case of white Gaussian noise. Perhaps more interestingly, this comparison technique can in the future

Hα plus [NII] and R-band CCD photometry and derived parameters are presented for the full sample of 334 spiral and irregular galaxies. Galaxy distances are derived using a Virgo-infall corrected model which is described in the paper, and star formation rates are derived from Hα plus [NII] fluxes using the conversion defined by Kennicutt et al.

We undertook a multisite spectroscopic campaign for the β Cephei star ν Eridani. A total of 2294 high-resolution spectra were obtained from telescopes at 11 different observatories around the world. The time base of dedicated multisite observations is 88 d. To this data set we have added 148 older, previously unpublished spectra, such that the