Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..630a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 630-635.
Astronomy and Astrophysics
Astrophysics
32
Early Stars, Ophiuchi Clouds, Radio Stars, Stellar Magnetospheres, Magnetic Stars, Pre-Main Sequence Stars, Very Long Base Interferometry
Scientific paper
VLBI 6-mm data are presently used to investigate the circularly polarized radio core previously identified around the young B3 star S1 in Rho Ophiuchi. The measured angular diameter and brightness temperature are found to be consistent with gyrosynchrotrom radiation emission from mildly relativistic electrons. A simple model based on a pole-on dipolar magnetic field of about 2 kG at the stellar surface suggests itself as consistent with the main observed features of the S1 magnetosphere; an important feature of the model is its taking the influence of the X-ray-emitting plasma into account. S1 may represent a new type of young stellar object, characterized by very extended magnetic fields.
Andre' Philippe
Klein Karl-Ludwig
Lestrade Jean-Francois
Phillips Robert B.
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