Abstract
We focus in this review on the properties of optically visible, young stellar objects (YSOs). We hope we will not be accused of undue anthropocentric reasoning if we say that these stars have an activity level compatible with their youth. Although each of these stars may display its own spectroscopic and photometric variability pattern at various wavelengths — which makes them fascinating objects to observe — they share enough basic properties to appear as classes of stars. We go through these various classes and their historical definitions in the following section. We then briefly address the question of their age; i.e., how do we know that they are young pre-main sequence stars? The rest of the review is devoted to the physical picture that has emerged over the last decade, focusing mainly on the physics of light variability, disk properties, and accretion. In each of these topics, we emphasize areas where we expect rapid progress in the next few years.
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Bertout, C., Ménard, F. (1999). The Nature of Young Solar-Type Stars. In: Lada, C.J., Kylafis, N.D. (eds) The Origin of Stars and Planetary Systems. NATO Science Series, vol 540. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4509-1_10
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