The quest for evolutionarydiagrams of young stellar objects

  • Francesco Palla
Part III: Young Stellar Objects and Their Environment
Part of the Lecture Notes in Physics book series (LNP, volume 465)


Young stellar objects (YSOs) are reviewed with an emphasis on their global evolutionary properties. The main classification schemes of YSOs based on the observed continuum spectral energy distributions and the recent suggestion of using a bolometric temperature to characterize the evolutionary status of all YSOs will be first discussed. The impact of protostar theory on pre-main-sequence evolution will be then addressed. The revised evolution differs in significant aspects from the traditional one, in particular for stars more massive than the sun. A new H-R diagram is presented in which the observed distribution of young stars of low and intermediate mass is naturally explained. The major sources of uncertainties for the location of evolutionary tracks, and hence for mass and age estimates of YSOs, are also discussed together with the effects of mass accretion and the presence of companions.


Main Sequence Stellar Mass Spectral Energy Distribution Young Star Evolutionary Track 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Francesco Palla
    • 1
    • 2
  1. 1.Osservatorio Astrofisico di ArcetriFirenzeItaly
  2. 2.Groupe de RadioastronomieEcole Normale SuperieureParisFrance

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