Microwave observations of nonthermal phenomena in pre-main sequence stars

  • Eric D. Feigelson
Activity in Pre-Main Sequence Stars
Part of the Lecture Notes in Physics book series (LNP, volume 291)


A modest fraction of low mass pre-main sequence (PMS) stars in nearby star forming clouds exhibit radio continuum emission. In some cases the emission is thermal bremsstrahlung from ionized circumstellar matter, but in other cases there is good evidence it is nonthermal emission from intense magnetic activity near the stellar surface. I review here prior evidence for magnetic activity in PMS stars, methods for finding such radio emission, distinguishing nonthermal from thermal emission, recent data from the VLA and its interpretation. A few PMS stars exhibit powerful nonthermal radio flares followed by periods of lower level emission, closely resembling active RS CVn-type systems. It is not yet clear what distinguishes the flaring stars from the majority of undetected stars.


Radio Emission Radio Source Tauri Star Nonthermal Emission Gyrosynchrotron Emission 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Eric D. Feigelson
    • 1
  1. 1.Department of AstronomyPenn State UniversityUniversity Park

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