Advertisement

On the Alignment of T Tauri Stars with the Local Magnetic Field in the Taurus Molecular Cloud Complex

  • Francois Ménard
  • Gaspard Duchêne

Abstract

Magnetic field is believed to play an important role in the collapse of a molecular cloud. In particular, due to the properties of magnetic forces, collapse should be easier along magnetic field lines. This is supported by the large-scale sheet-like structures observed in the Taurus giant molecular cloud for instance. Here we investigate whether such a preferred orientation for collapse is present at a much smaller scale, that of individual objects, i.e., about 100AU. We use recent high-angular resolution images of T Tauri stars located in the Taurus star-forming region to find the orientation of the symmetry axis of each star+jet+disk system and compare it with that of the local magnetic field. We find that (i) T Tauri stars that are associated to a jet or an outflow are generally oriented parallel to the magnetic field, as previously demonstrated. More surprising, given our current knowledge of these objects, we also find that (ii) T Tauri stars that are not at present believed to be associated to a jet or an outflow are oriented very differently, i.e., mostly perpendicular to the magnetic field. We present some implications of this puzzling new result.

Keywords

T Tauri stars magnetic field orientation disks jets 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Burrows, C.J. et al.: 1996, ApJ 473, 437.ADSCrossRefGoogle Scholar
  2. Dougados, C., Cabrit, S., Lavalley, C. and Ménard, F.: 2000, AA 356, L41.ADSGoogle Scholar
  3. Dutrey, A., Guilloteau, S., Duvert, G., Prato, L., Simon, M., Schuster, K. and Ménard, F.: 1996, AA 309, 493.ADSGoogle Scholar
  4. Ferreira, J. and Pelletier, G.: 1995, AA 295, 807.ADSGoogle Scholar
  5. Ferreira, J.: 1997, AA 319, 340.ADSGoogle Scholar
  6. Galli, D. and Shu, F.H.: 1993, ApJ 417, 243.ADSCrossRefGoogle Scholar
  7. Goodman, A.A., Bastien, P., Ménard, F. and Myers, P.C.: 1990, ApJ 359, 363.ADSCrossRefGoogle Scholar
  8. Goodman, A.A., Jones, T.J., Lada, E.A. and Myers, P.C.: 1992, ApJ 399, 108.ADSCrossRefGoogle Scholar
  9. Hartmann, L.: 2002, Api 578, 914.ADSGoogle Scholar
  10. Herbig, G.H. and Bell, K.R.: 1988, Lick Obs. Bull., No. 1111.Google Scholar
  11. Heyer, M.H., Vrba, F.J., Snel, R.L., Schloerb, F.P., Strom, S.E., Goldsmith, P.F. and Strom, K.M.: 1987, ApJ 321, 855.ADSCrossRefGoogle Scholar
  12. Hirth, G.A., Mundt, R. and Solf, J.: 1997, AAS 126, 437.ADSGoogle Scholar
  13. Kitamura, Y., Momose, M., Yokogawa, S., Kawabe, R., Tamura, M. and Ida, S.: 2002, ApJ 581, 357.ADSCrossRefGoogle Scholar
  14. Lazarian, A.: 2002, Elsevier preprint (astro-ph/0208487).Google Scholar
  15. Lee, C.W. and Myers, P.C.: 1999, ApJS 123, 233.ADSCrossRefGoogle Scholar
  16. Ménard, F., Dougados, C., Magnier, E., Duchêne, G., Cuillandre, J.C., Martin, E.L., Fahlman, G., Forveille, T., Lai, O., Manset, N., Martin, P., Veillet, C. and Magazzu, A.: 2004, ApJ,in press. Ménard, F. and Duchêne, G.: 2004, AA submitted.Google Scholar
  17. Moneti, A., Pipher, J.L., Helfer, H.L., McMillan, R.S. and Perry, M.L.: 1984, ApJ 282, 508.ADSCrossRefGoogle Scholar
  18. Mundt, R., Ray, T.P. and Raga, A.C.: 1991, AA 252, 740.ADSGoogle Scholar
  19. Roddier, C., Roddier, F., Northcott, M.J., Graves, J.E. and Jim, K.: 1996, ApJ 463, 326.ADSCrossRefGoogle Scholar
  20. Shu, F.H., Najita, J., Ostriker, E.C. and Shang, H.: 1995, Api 455, L155.Google Scholar
  21. Simon, M., Dutrey, A. and Guilloteau, S.: 2000, Api 545, 1034.ADSGoogle Scholar
  22. Strom, K.M., Strom, S.E., Wolff, S.C., Morgan, J. and Wenz, M.: 1986, ApJS 62, 39.ADSCrossRefGoogle Scholar
  23. Tamura, M., Nagata, T., Sato, S. and Tanaka, M.: M. 1987, MNRAS 224, 413.Google Scholar
  24. Tamura, M. and Sato, S.: 1989, AJ 98, 1368.ADSCrossRefGoogle Scholar
  25. Vrba, F.J., Strom, S.E. and Strom, K.M.: 1976, AJ 81, 958.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2004

Authors and Affiliations

  • Francois Ménard
    • 1
  • Gaspard Duchêne
    • 2
  1. 1.Laboratoire d’Astrophysique de GrenobleGrenoble Cedex 9France
  2. 2.Department of Physics & AstronomyUCLALos AngelesUSA

Personalised recommendations