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Ages of Young Stars by Soderblom, David R.; Hillenbrand, Lynne A.; Jeffries, Rob D.; Mamajek, Eric E.; Naylor, Tim is a scholarly article available to read on EtoBox.

What is Ages of Young Stars about?

Determining the sequence of events in the formation of stars and planetary systems and their time-scales is essential for understanding those processes, yet establishing ages is fundamentally difficult because we lack direct indicators. In this review we discuss the age challenge for young stars, specifically those less than ~100 Myr old. Most age determination methods that we discuss are primarily applicable to groups of stars but can be used to estimate the age of individual objects. A reliable age scale is established above 20 Myr from measurement of the Lithium Depletion Boundary (LDB) in young clusters, and consistency is shown between these ages and those from the upper main sequence and the main sequence turn-off -- if modest core convection and rotation is included in the models of higher-mass stars. Other available methods for age estimation include the kinematics of young groups, placing stars in Hertzsprung-Russell diagrams, pulsations and seismology, surface gravity measurement, rotation and activity, and lithium abundance. We review each of these methods and present known strengths and weaknesses. Below ~20 Myr, both model-dependent and observational uncertainties grow

Author

Soderblom, David R.; Hillenbrand, Lynne A.; Jeffries, Rob D.; Mamajek, Eric E.; Naylor, Tim

Published

2013

Language

EN