Laurent Loinard et al 2005 ApJ 619 L179 doi:10.1086/428349
Multiepoch VLBA Observations of T Tauri South
FREELaurent Loinard1, Amy J. Mioduszewski2, Luis F. Rodríguez1, Rosa A. González1, Mónica I. Rodríguez1 and Rosa M. Torres1
Show affiliationsIn this Letter, we present a series of seven observations of the compact, nonthermal radio source associated with T Tauri South made with the Very Long Baseline Array (VLBA) over the course of 1 year. The emission is found to be composed of a compact structure most certainly originating from the magnetosphere of an underlying pre-main-sequence star and a low brightness extension that may result from reconnection flares at the star-disk interface. The accuracy of the absolute astrometry offered by the VLBA allows us to make very precise determinations of the trigonometric parallax and proper motion of T Tau South. The proper motion derived from our VLBA observations agrees with that measured with the Very Large Array over a similar period to better than 2 mas yr-1, and it is fully consistent with the infrared proper motion of T Tau Sb, the pre-main-sequence M star with which the radio source has traditionally been associated. The parallax, π = 7.07 ± 0.14 mas, corresponds to a distance of 141.5
pc.
- Subject headings
astrometry; binaries: general; magnetic fields; radiation mechanisms: non-thermal; radio continuum: stars; stars: formation
- Dates
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Issue 2 (2005 February 1)
Received 2004 November 1, accepted for publication 2004 December 20
Published 2005 January 10
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Multiepoch VLBA Observations of T Tauri South
Laurent Loinard et al 2005 ApJ 619 L179
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