MOONS/ Multi Object Optical and Near-infrared Spectrograph is a new fibre fed spectrograph that will be installed at the ESO’s/ European Southern Observatory’s VLT/Very Large Telescope at La Paranal, Chile. MOONS which will operate from 6000A to 18000A wavelength range will have very high multiplex of 1000 fibres and will use the full 25 arcminutes field of view of 8m mirror VLT and will make...
The solar convective envelope generates, by dynamo effect, a surface magnetic field whose strength evolves on an 11-year cycle, with a change in polarity at the end of each cycle. A similar magnetic variability exists in other solar-type stars, influencing their dynamics. Furthermore, solar-like oscillators experience acoustic modes whose properties, such as their frequency, amplitude and...
Résumé:
Du fait de sa masse et de son abondance, l’hélium joue un rôle fondamental dans de nombreux processus astrophysiques. La compréhension des phénomènes physiques qui lui sont associés ainsi que la détermination de son abondance ont des répercussions dans des domaines aussi variés que la cosmologie, la modélisation stellaire ou l'étude du vent solaire. Si des caractérisations des...
The search for traces of past or present life is a major objective of the exploration of Mars. Subsurface environments, such as caves and lava tubes, are of significant exobiological interest for their potential as both refuges for extant life and/or reservoirs for ‘preserved’ traces of life (i.e., biosignatures). Unlike the Martian surface, subsurface environments can provide protection from...
