Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-02T22:27:56.334Z Has data issue: false hasContentIssue false
  • English
  • Français

VLBA determinations of the distances to nearby star-forming regions

Published online by Cambridge University Press:  01 October 2007

L. Loinard ,
R. M. Torres ,
A. J. Mioduszewski  and
L. F. Rodríguez
L. Loinard
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: [email protected], [email protected], [email protected]
R. M. Torres
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: [email protected], [email protected], [email protected]
A. J. Mioduszewski
Affiliation:
National Radio Astronomy Observatory, Array Operations Center1003 Lopezville Road, Socorro, NM 87801, USA email: [email protected]
L. F. Rodríguez
Affiliation:
Centro de Radiastronomía y Astrofísica, Universidad Nacional Autónoma de MéxicoApartado Postal 72-3 (Xangari), 58089 Morelia, Michoacán, México email: [email protected], [email protected], [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Keywords

astrometrystars: distancesstars: formationradio continuum: starsstars: magnetic fieldsradiation mechanisms: nonthermaltechniques: interferometricbinaries: generalISM: clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 186 - 189
Copyright
Copyright © International Astronomical Union 2008

References

Andre, P., Deeney, B. D., Phillips, R. B., & Lestrade, J.-F. 1992, ApJ, 401, 667CrossRefGoogle Scholar
Bertout, C., Robichon, N., & Arenou, F., 1999, A&A, 352, 574Google Scholar
Bertout, C. & Genova, F. 2006, A&A, 460, 499Google Scholar
Brisken, W. F., Benson, J. M., Beasley, A. J., Fomalont, E. B., Goss, W. M., & Thorsett, S. E. 2000, ApJ, 541, 959CrossRefGoogle Scholar
Brisken, W. F., Benson, J. M., Goss, W. M., & Thorsett, S. E. 2002, ApJ, 571, 906CrossRefGoogle Scholar
Chini, R. 1981, A&A, 99, 346Google Scholar
Elias, J. H. 1978a, ApJ, 224, 857CrossRefGoogle Scholar
Elias, J. H. 1978b, ApJ, 224, 453CrossRefGoogle Scholar
Feigelson, E. D. & Montmerle, T., 1999, ARAA, 37, 363CrossRefGoogle Scholar
Hachisuka, K., et al. 2006, ApJ, 645, 337CrossRefGoogle Scholar
Hirota, T., et al. PASJ, in press (http://arxiv.org/abs/0705.3792)Google Scholar
Kenyon, S. J., Dobrzycka, D., & Hartmann, L., 1994, AJ, 108, 1872CrossRefGoogle Scholar
Knude, J. & Hog, E. 1998, A&A, 338, 897Google Scholar
Lestrade, J.-F., Preston, R. A., Jones, D. L., et al. , 1999, A&A, 344, 1014Google Scholar
Loinard, L., Torres, R. M., Mioduszewski, A. J., Rodríguez, L. F., González, R. A., Lachaume, R., Vázquez, V., & González, E. 2007, ApJ, 671, 546CrossRefGoogle Scholar
Loinard, L., Mioduszewski, A. J., Rodríguez, L. F., González, R. A., Rodríguez, M. I., & Torres, R. M. 2005, ApJL, 619, L179CrossRefGoogle Scholar
Loinard, L., Rodríguez, L. F., & Rodríguez, M. I., 2003, ApJ, 587, L47CrossRefGoogle Scholar
Motte, F., Andre, P., & Neri, R. 1998, A&A, 336, 150Google Scholar
Perryman, M. A. C., Lindegren, L., Kovalevsky, J., et al. , 1997, A&A, 323, L49Google Scholar
Sandstrom, K. M., et al. , ApJ, in press (http://arxiv.org/abs/0706.2361)Google Scholar
Torres, R. M., Loinard, L., Mioduszewski, A. J., & Rodríguez, L. F. 2007, ApJ, in pressGoogle Scholar
Xu, Y., Reid, M. J., Zheng, X. W., & Menten, K. M. 2006, Science, 311, 54CrossRefGoogle Scholar