Magnetically modulated accretion in T Tauri stars

Details Magnetically modulated accretion in T Tauri stars Magnetically modulated accretion in T Tauri stars

1995-02-11

arxiv.org/abs/astro-ph/9502061v1

Astronomy and Astrophysics

Astrophysics

LaTeX file (requires mn.sty), 4 pages, no figures or tables. To appear in MNRAS.

Scientific paper

We examine how accretion on to T Tauri stars may be modulated by a time-dependent `magnetic gate' where the inner edge of the accretion disc is disrupted by a varying stellar field. We show that magnetic field variations on time-scales shorter than 10^5 yr can modulate the accretion flow, thus providing a possible mechanism both for the marked photometric variability of T Tauri stars and for the possible conversion of T Tauri stars between classical and weak line status. We thus suggest that archival data relating to the spectrophotometric variability of T Tauri stars may provide an indirect record of magnetic activity cycles in low-mass pre-main-sequence stars.

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