Hostname: page-component-8448b6f56d-c4f8m Total loading time: 0 Render date: 2024-04-23T12:14:37.993Z Has data issue: false hasContentIssue false
  • English
  • Français

The Cycles of Alpha Centauri

Published online by Cambridge University Press:  26 February 2010

Thomas R. Ayres
Thomas R. Ayres*
Affiliation:
Center for Astrophysics & Space Astronomy, University of Colorado, 389-UCB (CASA), Boulder, Colorado, USA email: Thomas.Ayres@Colorado.edu
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.

The main AB pair of the nearby Alpha Centauri triple system has one of the most extensive X-ray records of any cosmic object, stretching over three decades. The primary, α Cen A (G2V), is a near twin of the Sun, with a similarly soft (1–2 MK) corona. The secondary, α Cen B (K1V), is more active than the Sun, with a generally harder coronal spectrum. Here, spatially resolved measurements of the pair by Chandra's High Resolution Camera are compared, on a common basis, with previous pointings from ROSAT and XMM-Newton.

Keywords

X-rays: starsstars: individual (HD 128620, HD 128621)stars: activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 146 - 149
Copyright
Copyright © International Astronomical Union 2010

References

Acton, L. 1996, in: Pallavicini, R. & Dupree, A. K. (eds.), Ninth Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, ASP Conf. Proc. 109, (San Francisco: ASP), p. 45Google Scholar
Ayres, T. R. 1997, JGR, 102, 1641CrossRefGoogle Scholar
Ayres, T. R., Judge, P. G., Saar, S. H., & Schmitt, J. H. M. M. 2008, ApJ, 678, L121CrossRefGoogle Scholar
Ayres, T. R. 2009, ApJ, 696, 1931CrossRefGoogle Scholar
Favata, F., et al. 2004, A&A, 418, L13Google Scholar
Golub, L., Harnden, F. R. Jr., Pallavicini, R., Rosner, R., & Vaiana, G. S. 1982, ApJ, 253, 242CrossRefGoogle Scholar
Güdel, M. 2004, A&AR, 12, 71Google Scholar
Hempelmann, et al. , 2006, A&A, 460, 261Google Scholar
Judge, P. G. & Saar, S. H. 2007, ApJ, 663, 643CrossRefGoogle Scholar
Judge, P. G., Solomon, S. C., & Ayres, T. R. 2003, ApJ, 593, 534CrossRefGoogle Scholar
Nugent, J. & Garmire, G. 1978, ApJ, 226, L83CrossRefGoogle Scholar
Parker, E. N. 1970, ApJ, 162, 665CrossRefGoogle Scholar
Radick, R. R., Lockwood, G. W., Skiff, B. A., & Baliunas, S. L. 1998, ApJS, 118, 239CrossRefGoogle Scholar
Robrade, J., Schmitt, J. H. M. M., & Favata, F. 2005, A&A, 442, 315Google Scholar
Schmitt, J. H. M. M. & Liefke, C. 2004, A&A, 417, 651Google Scholar
Stern, R. A. 2001, Advances in Space Research, 26, 1723CrossRefGoogle Scholar
Wilson, O. C. 1978, ApJ, 226, 379CrossRefGoogle Scholar