VLBI observations of Theta(1) Orionis A

Details VLBI observations of Theta(1) Orionis A VLBI observations of Theta(1) Orionis A

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217..179f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 179-186. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

22

Binary Stars, Early Stars, Radio Sources (Astronomy), T Tauri Stars, Very Long Base Interferometry, Brightness Temperature, Radio Emission, Stellar Coronas, Stellar Flares, Stellar Winds

Scientific paper

The radio source associated with the star Theta(1) Ori A has been observed at 6 cm with the European VLBI Network and detected on most baselines. The visibility curve is consistent with an angular diameter of less than 4 mas and a flux density of 13 mJy. The derived brightness temperature of more than 4 x 10 to the 7th K proves that the emission mechanism is nonthermal. Several nonthermal models, including magnetic loops, a chaotic wind, and a rapidly rotating magnetic star, are proposed to explain the high brightness temperature. No firm constraints can be placed on any of these hypotheses.

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