VLBA determination of the distance to nearby star-forming regions. I. The distance to T Tauri with 0.4% accuracy
Por:
Loinard L., Torres R.M., Mioduszewski A.J., Rodríguez L.F., González-Lópezlira R.A., Lachaume R., Vázquez V., González E.
Publicada:
1 ene 2007
Resumen:
In this article, we present the results of a series of 12 3.6 cm radio continuum observations of T Tau Sb, one of the companions of the famous young stellar object T Tauri. The data were collected roughly every 2 months between 2003 September and 2005 July with the Very Long Baseline Array (VLBA). Thanks to the remarkably accurate astrometry delivered by the VLBA, the absolute position of T Tau Sb could be measured with a precision typically better than about 100 µas at each of the 12 observed epochs. The trajectory of T Tau Sb on the plane of the sky could therefore be traced very precisely and was modeled as the superposition of the trigonometric parallax of the source and an accelerated proper motion. The best fit yields a distance to T Tau Sb of 147.6 ± 0.6pc. The observed positions of T Tau Sb are in good agreement with recent infrared measurements, but they seem to favor a somewhat longer orbital period than that recently reported by Duchêne and coworkers for the T Tau Sa/T Tau Sb system. © 2007. The American Astronomical Society. AU rights reserved.
Filiaciones:
Loinard L.:
Centro de Radiostronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, Mexico
Torres R.M.:
Centro de Radiostronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, Mexico
Mioduszewski A.J.:
National Radio Astronomy Observatory, Array Operations Center, 1003 Lopezville Road, Socorro, NM 87801, United States
Rodríguez L.F.:
Centro de Radiostronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, Mexico
González-Lópezlira R.A.:
Centro de Radiostronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, Mexico
Lachaume R.:
Centro de Radiostronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, Mexico
Vázquez V.:
Universidad Tecnológica de la Mixteca, Carretera Huajuapan-Acatlima, 69000 Huajuapan de León, Oaxaca, Mexico
González E.:
Universidad Tecnológica de la Mixteca, Carretera Huajuapan-Acatlima, 69000 Huajuapan de León, Oaxaca, Mexico
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