Stellar 5 min Oscillations

Resonant absorption and the spectrum of 5-min oscillations of the Sun II. Fine structure of the spectrum of 5-min oscillations

The influence of magnetic field on the spectrum of 5-min solar oscillations has been investigated. The calculations have been made within a model of the two-layer shell. The lower non-magnetized layer is characterized by linear decrease of temperature with height while in the upper layer with homogeneous horizontal magnetic field temperature increase, and reaches a coronal value at the height o...

Stellar Oscillations Network Group

Stellar Oscillations Network Group (SONG) is an initiative aimed at designing and building a network of 1m-class telescopes dedicated to asteroseismology and planet hunting. SONG will have 8 identical telescope nodes each equipped with a high-resolution spectrograph and an iodine cell for obtaining precision radial velocities and a CCD camera for guiding and imaging purposes. The main asterosei...

Stochastic Excitation of Stellar Oscillations

Excitation of solar oscillations is attribued to turbulent motions in the solar convective zone. It is also currently believed that oscillations of low massive stars (M < 2 M⊙) which possess an upper convective zone are stochastically excited by turbulent convection in their outer layers. A recent theoretical work (Samadi and Goupil, 2001; Samadi et al., 2001) supplements and reinforces this th...

Lecture Notes on Stellar Oscillations

Min-protein oscillations in round bacteria.

In rod-shaped Escherichia coli cells, the Min proteins, which are involved in division-site selection, oscillate from pole-to-pole. The homologs of the Min proteins from the round bacterium Neisseria gonorrhoeae also form a spatial oscillator when expressed in wild-type and round, rodA- mutants of E. coli, suggesting that the Min proteins form an oscillator in N. gonorrhoeae. Here we report tha...