Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-24T01:19:38.688Z Has data issue: false hasContentIssue false
  • English
  • Français

A large rotating structure around AB Doradus A at VLBI scale

Published online by Cambridge University Press:  24 September 2020

J. B. Climent Open the ORCID record for J. B. Climent [Opens in a new window] ,
J. C. Guirado ,
R. Azulay  and
J. M. Marcaide
J. B. Climent
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected]
J. C. Guirado
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected] Observatori Astronòmic, Universitat de València, Parc Científic, C. Catedrático José Beltrán 2, 46980 Paterna, València, Spain
R. Azulay
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [email protected]
J. M. Marcaide
Affiliation:
Departament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, 46100 Burjassot, València, Spain email: [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.

We report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.

Keywords

stars: pre–main-sequencestars: rotationstars: imagingstars: magnetic fieldsstars: flareradio continuum: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 189 - 194
Copyright
© International Astronomical Union 2020

References

Azulay, R., Guirado, J. C., Marcaide, J. M., et al. 2017, A&A, 607, A10 Google Scholar
Barenfeld, S. A., Bubar, E. J., Mamajek, E. E., & Young, P. A. 2013, ApJ, 766, 6 CrossRefGoogle Scholar
Bell, C. P. M., Mamajek, E. E., & Naylor, T. 2015, MNRAS, 454, 593 CrossRefGoogle Scholar
Boccaletti, A., Chauvin, G., Baudoz, P., & Beuzit, J.-L. 2008, A&A, 482, 939 Google Scholar
Close, L. M., Lenzen, R., Guirado, J. C., et al. 2005, Nature, 433, 286 CrossRefGoogle Scholar
Close, L. M., Thatte, N., Nielsen, E. L., et al. 2007, ApJ, 665, 736 CrossRefGoogle Scholar
Franciosini, E., Massi, M., Paredes, J. M., & Estalella, R. 1999, A&A, 341, 595 Google Scholar
Guirado, J. C., Reynolds, J. E., Lestrade, J.-F., et al. 1997, ApJ, 490, 835 CrossRefGoogle Scholar
Guirado, J. C., Martí-Vidal, I., Marcaide, J. M., et al. 2006, A&A, 446, 733 Google Scholar
Guirado, J. C., Marcaide, J. M., Martí-Vidal, I., et al. 2011, A&A, 533, A106 Google Scholar
Herbst, W. & Shevchenko, V. S. 1999, AJ, 118, 1043 CrossRefGoogle Scholar
Janson, M., Brandner, W., Lenzen, R., et al. 2007, A&A, 462, 615 Google Scholar
Lindegren, L. & Kovalevsky, J. 1995, A&A, 304, 189 Google Scholar
Lestrade, J.-F., Jones, D. L., Preston, R. A., et al. 1995, A&A, 304, 182 Google Scholar
López-Santiago, J., Montes, D., Crespo-Chacón, I., & Fernández-Figueroa, M. J. 2006, ApJ, 643, 1160 CrossRefGoogle Scholar
Luhman, K. L. & Potter, D. 2006, ApJ, 638, 887 CrossRefGoogle Scholar
Mutel, R. L., Molnar, L. A., Waltman, E. B., & Ghigo, F. D. 1998, ApJ, 507, 371 CrossRefGoogle Scholar
Nielsen, E. L., Close, L. M., Guirado, J. C., et al. 2005, Astron. Nachr., 326,1033CrossRefGoogle Scholar
Ransom, R. R., Bartel, N., Bietenholz, M. F., et al. 2002, ApJ, 572, 487 CrossRefGoogle Scholar
Shepherd, M. C., Pearson, T. J., & Taylor, G. B. 1994, BAAS, 26, 987 Google Scholar
Zuckerman, B., Song, I., & Bessell, M. S. 2004, ApJ, 613, L65 CrossRefGoogle Scholar