Milliarcsecond radio structure of weak-lined T Tauri stars

Details Milliarcsecond radio structure of weak-lined T Tauri stars Milliarcsecond radio structure of weak-lined T Tauri stars

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..261p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 261-269. Research supported by NSF, NASA, TRW, Inc.,

Astronomy and Astrophysics

Astrophysics

74

Radio Emission, Radio Stars, T Tauri Stars, Very Large Array (Vla), Very Long Base Interferometry, Bremsstrahlung, Brightness Temperature, Pre-Main Sequence Stars, Stellar Envelopes, Stellar Winds

Scientific paper

VLBI and VLA observations of six radio-bright weak-lined T Taur (WTT) stars are reported, as well as direct measurements of the sizes of the emitting regions. VLBI measurements established that essentially all the radio emission from these premain-sequence stars originates in regions 15 stellar radii or less in size. Corresponding brightness temperatures ranged from 10 exp 7.5 to not less than 10 exp 9 K, ruling out a thermal process such as free-free bremsstrahlung radiation from a circumstellar wind. The radio luminosity and structure of several stars changed significantly between measurements separated by 1 day. HD 283447 showed intraday radio variability on time scales as short as 1 hr. Corresponding VLBI measurements show a new unresolved component appearing after an increase in flux density, possibly indicating that the driving agent for larger radio flares originates close to the star. The high conformation rate of nonthermal radio emission from this initial sample of radio-bright WTT stars show that these solar-type premain-sequence stars alter their immediate environments via magnetic processes to an extent comparable to that shown by RS CVn or Algol close binaries.

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