Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315...53f&link_type=abstract
In its Formation of Stars and Planets, and the Evolution of the Solar System p 53-56 (SEE N91-18922 10-90)
Physics
1
Interstellar Magnetic Fields, Magnetic Field Configurations, Stellar Activity, Stellar Envelopes, Stellar Flares, Stellar Mass Ejection, Magnetic Clouds, Nebulae, Solar Corona, Stellar Evolution
Scientific paper
Stellar activity studies are used for information on the early Sun and its environment, and for estimating activity effects on the young solar nebula. Large scale active structures are diagnosed from their rotational modulation signature, and reconstructed in three dimensions, using topographic or Doppler imaging techniques. Young stars undergo violent flares associated with coronal mass ejections leading to mass loss rates that can affect the stellar environment and stellar evolution. Young stars show large coronal condensations, magnetically linked with the stellar surface, that can be destabilized by energetic flares. From a joint ESA/AAT/IUE campaign, masses of such circumstellar clouds around the young star AB Doradus are estimated. These studies allow the problems of the link between circumstellar structures and magnetic activity and the role of mass ejections and flares in the context of mass loss and angular momentum braking in young stars, and early stellar evolution to be addressed.
Collier-Cameron Andrew
Ehrenfreund Pascale
Foing Bernard H.
Houdebine E.
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