The He I λ10833 Å triplet is a powerful tool for characterising the upper atmosphere of exoplanets and tracing possible mass loss. Here, we analysed one transit...

The identification of the Jovian frequency spectrum obtained by Schmider et al. (1990, 1991) is proposed from Doppler shift observations of the solar sodium D...

EK Cep is a double-lined eclipsing binary system with unique characteristics. Accurate absolute dimensions are available, a good determination of the surface...

We used a new generation of asymptotic giant branch (AGB) stellar models that include dust formation in the stellar winds to find the links between evolutionary...

Theoretical pulsation frequencies derived from a typical model computation are used to identify the periods during which the Delta Scuti star 63 Herculis...

Astronomical infrared spectral features at ~6.6, 9.8 and 20 micronm have recently been suggested as being due to the planar graphene form of C24 carbon cluster...

Recent observations and theoretical considerations have linked gamma-ray bursts with ultra-bright type Ibc supernovae (`hypernovae'). We here work out a...

We report on the detection of a third massive star component in the σ Orionis AB system, traditionally considered as a binary system. The system has been...

A three-dimensional equation for deriving the scattering properties per unit volume of interplanetary space is obtained. The equation is related to the zodiacal...