Stellar evolution before the ZAMS

Details Stellar evolution before the ZAMS Stellar evolution before the ZAMS

2005-08-25

arxiv.org/abs/astro-ph/0508545v1

Astronomy and Astrophysics

Astrophysics

To appear in Massive Star Birth: A Crossroads fro Astrophysics, eds. R. Cesaroni et al. (CUP)

Scientific paper

10.1017/S1743921305004540

Young stars on their way to the ZAMS evolve in significantly different ways depending on mass. While the theoretical and observational properties of low- and intermediate-mass stars are rather well understood and/or empirically tested, the situation for massive stars (>10-15 Msun) is, to say the least, still elusive. On theoretical grounds, the PMS evolution of these objects should be extremely short, or nonexistent at all. Observationally, despite a great deal of effort, the simple (or bold) predictions of simplified models of massive star formation/evolution have proved more difficult to be checked. After a brief review of the theoretical expectations, I will highlight some critical test on young stars of various masses.

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