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Multi-epoch VLBA observations of T Tauri South | | Laurent Loinard
; Amy Mioduszewski
; Luis. F. Rodriguez
; Rosa A. Gonzalez
; Monica I. Rodriguez
; Rosa M. Torres
; | | Date: |
4 Dec 2004 | | Journal: | Astrophys.J. 619 (2005) L179-L182 | | Subject: | astro-ph | | Affiliation: | CRyA, UNAM), Amy Mioduszewski (NRAO), Luis. F. Rodriguez (CRyA), Rosa A. Gonzalez (CRyA), Monica I. Rodriguez (CRyA), Rosa M. Torres (CRyA | | Abstract: | In this Letter, we present a series of seven observations of the compact, non-thermal radio source associated with T Tauri South made with the Very Long Baseline Array over the course of one 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 which may result from reconnection flares at the star-disk interface. The accuracy of the absolute astrometry offered by the VLBA allows 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 VLA over a similar period to better than 2 mas yr$^{-1}$, and 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, $pi$ = 7.07 $pm$ 0.14 mas, corresponds to a distance of 141.5$^{+2.8}_{-2.7}$ pc. | | Source: | arXiv, astro-ph/0501062 | | Services: | Forum | Review | PDF | Favorites | |
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