Non coeval young multiple systems? On the pairing of protostars and T Tauri stars

Details Non coeval young multiple systems? On the pairing of protostars and T Tauri stars Non coeval young multiple systems? On the pairing of protostars and T Tauri stars

2003-05-31

arxiv.org/abs/astro-ph/0306014v1

Astronomy and Astrophysics

Astrophysics

8 pages, 1 figure, to appear in the conference proceedings of "Open Issues in Local Star Formation and Early Stellar Evolution

Scientific paper

We summarize here the observed properties of ``infrared companions'' to T Tauri stars and argue that their observational properties are identical to those of Class I sources. They may therefore be embedded protostars in a much earlier evolutionary phase than T Tauri stars, in which case these multiple systems are significantly non-coeval as opposed to the majority of young binary systems. They would have formed through a different mechanism than core fragmentation. The only distinction between IRCs and Class I sources is that they lie within a few tens of AU of a T Tauri star, and so they cannot be at the center of a vast optically thick envelope as is believed to be the case for protostars. We discuss whether systems with an IRC are really candidates for non-coeval multiple systems.

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