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VLBA determinations of the distances to nearby star-forming regions

Published online by Cambridge University Press:  01 October 2007

L. Loinard
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: l.loinard@astrosmo.unam.mx, r.torres@astrosmo.unam.mx, l.rodriguez@astrosmo.unam.mx
R. M. Torres
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: l.loinard@astrosmo.unam.mx, r.torres@astrosmo.unam.mx, l.rodriguez@astrosmo.unam.mx
A. J. Mioduszewski
Affiliation:
National Radio Astronomy Observatory, Array Operations Center1003 Lopezville Road, Socorro, NM 87801, USA email: amiodusz@aoc.nrao.edu
L. F. Rodríguez
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: l.loinard@astrosmo.unam.mx, r.torres@astrosmo.unam.mx, l.rodriguez@astrosmo.unam.mx
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Abstract

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Using phase-referenced multi-epoch Very Long Baseline Array observations, we have measured the trigonometric parallax of several young stars in the Taurus and Ophiuchus star-forming regions with unprecedented accuracy. The mean distance to the Taurus complex was found to be about 140 pc, and its depth around 20 pc, comparable to the linear extent of Taurus on the sky. In Ophiuchus, 4 sources have been observed so far. Two of them were found to be at about 160 pc (the distance traditionally attributed to Ophiuchus), while the other 2 are at about 120 pc. Since the entire Ophiuchus complex is only a few parsecs across, this difference is unlikely to reflect the depth of the region. Instead, we argue that two physically unrelated sites of star-formation are located along the line of sight toward Ophiuchus.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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