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Magnetic activity, high-energy radiation and variability: from young solar analogs to low-mass objects

Published online by Cambridge University Press:  26 February 2010

Manuel Güdel
Manuel Güdel*
Affiliation:
Institute of Astronomy, ETH Zurich, 8093 Zurich, Switzerland email: [email protected]
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Abstract

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Magnetic activity on cool stars expresses itself in a bewildering variety of radiative and particle output originating from magnetic regions between the photosphere and the corona. Given its origin in evolving magnetic fields, most of this output is variable in time. Radiation in the ultraviolet, the extreme ultraviolet, and the X-ray ranges are important for heating and ionizing upper planetary atmospheres and thus driving atmospheric evaporation. Additionally, stellar winds interact with the upper atmospheres and may lead to further erosion. The stellar high-energy output is therefore a prime factor in determining habitability of planets. We summarize our knowledge of magnetic activity in young solar analogs and lower-mass stars and show how the stellar output changes on evolutionary timescales.

Keywords

Sun: evolutionstars: activitystars: evolutionstars: flarestars: rotationstars: magnetic fieldsstars: windsastrobiology
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. 375 - 384
Copyright
Copyright © International Astronomical Union 2010

References

Audard, M., Güdel, M., Drake, J. J., & Kashyap, V. L. 2000, ApJ, 541, 396CrossRefGoogle Scholar
Ayres, T. R. 1997, J. Geophys. Res., 102, 1641CrossRefGoogle Scholar
Battaglia, M., Grigis, P. C., & Benz, A. O. 2005, A&A 439, 737Google Scholar
Brown, A., Veale, A., Judge, P., Bookbinder, J. A., & Hubeny, I. 1990, ApJ, 361, 220CrossRefGoogle Scholar
Caffee, M. W., Hohenberg, C. M., Swindle, T. D., & Goswami, J. N. 1987, ApJ, 313, L31CrossRefGoogle Scholar
Caramazza, M., Drake, J. J., Micela, G., & Flaccomio, E. 2009, A&A, 503, 505Google Scholar
Chassefière, E. & Leblanc, F. 2004, Planet. Space Sci., 52, 1039CrossRefGoogle Scholar
Doyle, J. G. & Mathioudakis, M. 1991, A&A, 241, L41Google Scholar
Drake, S. A., Simon, T., & Brown, A. 1993, ApJ, 406, 247CrossRefGoogle Scholar
Gaidos, E. J., Güdel, M., & Blake, G. A. 2000, Geophys. Res. Lett., 27, 501CrossRefGoogle Scholar
Güdel, M. 2009, in Simbol-X: Focusing on the Hard X-Ray Universe, AIP Conf. Proc. 1126, 341Google Scholar
Güdel, M., Audard, M., Kashyap, V. L., Drake, J. J., & Guinan, E. F. 2003, ApJ, 582, 423CrossRefGoogle Scholar
Guinan, E. F. & Ribas, I. 2002, in ASP Conf. Ser. 269 Eds. Montesinos, B., Giménez, A., & Guinan, E. F. (San Francisco: ASP), 85Google Scholar
Grießmeier, J.-M., Stadelmann, A., Motschmann, U., Belisheva, N. K., Lammer, H., & Biernat, H. K. 2005, Astrobiology 5, 587CrossRefGoogle Scholar
Kashyap, V. L., Drake, J. J., Güdel, M., & Audard, M. 2002, ApJ, 580, 1118CrossRefGoogle Scholar
Kasting, J. F., Whitmire, D. P., & Reynolds, R. T. 1993, Icarus, 101, 108CrossRefGoogle Scholar
Khodachenko, M. L., Ribas, I., Lammer, H., Grießmeier, J.-M., Leitner, M., et al. 2007, Astrobiology 7, 167CrossRefGoogle Scholar
Kulikov, Y. N., Lammer, H., Lichtenegger, H. I. M., Penz, T., Breuer, D., et al. 2007, Space Sci. Rev., 129, 207CrossRefGoogle Scholar
Lammer, H., Lichtenegger, H. I. M., Biernat, H. K., Erkaev, N. V., Arshukova, I. L., et al. 2006, Planet. Space Sci., 54, 1445CrossRefGoogle Scholar
Lammer, H., Lichtenegger, H. I. M., Kulikov, Y. N., Grießmeier, J.-M., Terada, N., et al. 2007, Astrobiology 7, 185CrossRefGoogle Scholar
Lim, J. & White, S. M. 1996, ApJ, 462, L91CrossRefGoogle Scholar
Lim, J., White, S. M., & Slee, O. B. 1996, ApJ, 460, 976CrossRefGoogle Scholar
Lundin, R., Lammer, H., & Ribas, I. 2007, Space Sci. Rev., 129, 245CrossRefGoogle Scholar
Mestel, L. 1984, in Cool Stars, Stellar Systems, and the Sun: Third Cambridge Workshop, Eds. Baliunas, S. L., & Hartmann, L. (New York: Springer) 49CrossRefGoogle Scholar
Mullan, D. J., Doyle, J. G., Redman, R. O., & Mathioudakis, M. 1992 ApJ, 397, 225CrossRefGoogle Scholar
Osten, R. A., Drake, S., Tueller, J., Cummings, J., Perri, M., et al. 2007, ApJ, 654, 1052CrossRefGoogle Scholar
Parker, E. N. 1988, ApJ, 330, 474CrossRefGoogle Scholar
Pizzolato, N., Maggio, A., Micela, G., Sciortino, S., & Ventura, P. 2003, A&A, 397, 147Google Scholar
Randich, S. 2000, in Stellar Clusters and Associations: Convection, Rotation, and Dynamos, eds. Pallavicini, R., Micela, G., & Sciortino, S., (San Francisco: ASP), 401Google Scholar
Ribas, I., Guinan, E. F., Güdel, M., & Audard, M. 2005, ApJ, 622, 680CrossRefGoogle Scholar
Scalo, J., Kaltenegger, L., Segura, A. G., Fridlund, M., Ribas, I., et al. 2007, Astrobiology, 7, 85CrossRefGoogle Scholar
Sackmann, I.-J. & Boothroyd, A. I. 2003, ApJ, 583, 1024CrossRefGoogle Scholar
Soderblom, D. R., Stauffer, J. R., MacGregor, K. B., & Jones, B. F. 1993, ApJ, 409, 624CrossRefGoogle Scholar
Stelzer, B., Flaccomio, E., Briggs, K., Micela, G., Scelsi, L., et al. 2007, A&A, 468, 463Google Scholar
Telleschi, A., Güdel, M., Briggs, K., Audard, M., Ness, J.-U., & Skinner, S. L. 2005, ApJ, 622, 653CrossRefGoogle Scholar
van den Oord, G. H. J. & Doyle, J. G. 1997, A&A, 319, 578Google Scholar
Wargelin, B. J. & Drake, J. J. 2002, ApJ, 578, 503CrossRefGoogle Scholar
West, A. A., Hawley, S. L., Bochanski, J. J., Covey, K. R., Reid, I. N., et al. 2008, AJ, 135, 785CrossRefGoogle Scholar
Whitmire, D. P., Doyle, L. R., Reynolds, R. T., & Matese, J. J. 1995, J. Geophys. Res., 100, 5457CrossRefGoogle Scholar
Wood, B. E. & Linsky, J. L. 1998, ApJ 492, 788CrossRefGoogle Scholar
Wood, B. E., Müller, H.-R., Zank, G. P., & Linsky, J. L. 2002, ApJ, 574, 412CrossRefGoogle Scholar
Wood, B. E., Müller, H.-R., Zank, G. P., Linsky, J. L., Redfield, S. 2005, ApJ, 628, L143CrossRefGoogle Scholar