Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510l..41j&link_type=abstract
The Astrophysical Journal, Volume 510, Issue 1, pp. L41-L44.
Astronomy and Astrophysics
Astronomy
123
Accretion, Accretion Disks, Stars: Individual: Name: Babcock'S Star, Stars: Individual: Constellation Name: Bp Tauri, Stars: Magnetic Fields, Stars: Pre-Main-Sequence
Scientific paper
High-resolution (R ~ 60,000) circular spectropolarimetry of the classical T Tauri star BP Tauri is presented. No net polarization is detected in photospheric absorption lines, placing strong limits (3 sigma) on the mean longitudinal magnetic field (+/-200 G) that is present over the surface of the star. On the other hand, strong circular polarization is measured in the He I lambda5876 emission line of BP Tau, indicating a mean longitudinal magnetic field of 2460+/-120 G in the line formation region. This implies that accretion occurs preferentially along large-scale magnetic loops that occupy a small fraction of the stellar surface. These observations represent the first direct evidence for magnetically controlled accretion onto classical T Tauri stars.
Hatzes Artie P.
Johns-Krull Christopher M.
Kanaan Antonio
Valenti Jeff A.
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