VLBI survey of Rho Ophiuchi - A population of magnetized, diskless young stellar objects

Details VLBI survey of Rho Ophiuchi - A population of magnetized, diskless young stellar objects VLBI survey of Rho Ophiuchi - A population of magnetized, diskless young stellar objects

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..667a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 667-677.

Astronomy and Astrophysics

Astronomy

66

H Ii Regions, Molecular Clouds, Ophiuchi Clouds, Very Long Base Interferometry, Pre-Main Sequence Stars, Protostars, Radio Sources (Astronomy), Sky Surveys (Astronomy), Stellar Magnetic Fields, T Tauri Stars

Scientific paper

Results are reported of VLBI observations of nine Rho Oph YSOs, which yield positive detections in five cases, with flux densities ranging from 1.2 to 9 mJy at 3.6 cm. In contrast, while simultaneously detected by the VLA at levels of a few mJy, the protostellar outflow source IRAS 16293 and the 'protostar' candidate YLW 15 were overresolved and undetected on the Goldstone-VLA baseline. The radio emission from the young A star VSSG 14 was measured to be circularly polarized, at a level comparable to what had previously been observed for the embedded magnetic B star S1. The brightness temperatures measured for the VLBI-detected TSOs range from about 10 exp 7 to greater than about 8 x 10 exp 7 J, unambiguously establishing that these radio sources are nonthermal, and not the result of circumstellar ionized winds as is probably the case for IRAS 16293 and YLW 15.

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