The evolutionary status of weak-line T Tauri stars.

Details The evolutionary status of weak-line T Tauri stars. The evolutionary status of weak-line T Tauri stars.

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esoc...33..407m&link_type=abstract

ESO Workshop on Low Mass Star Formation and Pre-Main Sequence Objects, p. 407 - 422

Physics

20

Stellar Evolution: Low-Mass Stars, Stellar Evolution: T Tauri Stars, Accretion Disks: T Tauri Stars

Scientific paper

The discovery, thanks to X-ray observations, of a new class of pre-main sequence objects, now known as "weak-line T Tauri stars" ("WTTS"), as well as recent progress in the theoretical understanding of the "classical" T Tauri stars ("CTTS"), have shed a new light on young stages of evolution of low mass stars. The authors show that many WTTS are surrounded by circumstellar material in the form of hollow, cold disks. In a revised evolutionary scenario, they tentatively suggest that these disks evolve independently of the central star on a wide range of timescales (≡105 to 107yrs), via the disappearance of the boundary layers, caused by a progressive inside-out clearing of the disks out to large distances (>1 - 10 AU). Their evolution may be governed in part by efficient dynamical instabilities, in particular in presence of a sufficiently strong stellar magnetic field, and in part by dust grain condensation possibly leading to planet formation.

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