Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-24T11:16:07.909Z Has data issue: false hasContentIssue false
  • English
  • Français

The spots on Ap stars

Published online by Cambridge University Press:  26 August 2011

Oleg Kochukhov
Oleg Kochukhov*
Affiliation:
Department Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden 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.

The upper main sequence magnetic chemically peculiar (Ap) stars exhibit a non-uniform distribution of chemical elements across their surfaces and with height in their atmospheres. These inhomogeneities, responsible for the conspicuous photometric and spectroscopic variation of Ap stars, are believed to be produced by atomic diffusion operating in the stellar atmospheres stabilized by multi-kG magnetic fields. Here I present an overview of the current state-of-the-art in understanding Ap-star spots and their relation to magnetic fields. In particular, I highlight recent 3-D chemical spot structure studies and summarize magnetic field mapping results based on the inversion of the full Stokes vector spectropolarimetric observations. I also discuss a puzzling new type of spotted stars, HgMn stars, in which the formation and evolution of heavy element spots is driven by a poorly understood mechanism, apparently unrelated to magnetic fields.

Keywords

Polarizationstars: chemically peculiarstars: magnetic fieldsstars: atmospheres
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 249 - 255
Copyright
Copyright © International Astronomical Union 2011

References

Adelman, S. J., Gulliver, A. F., Kochukhov, O. P., & Ryabchikova, T. A. 2002, Astrophys. J., 575, 449CrossRefGoogle Scholar
Adelman, S. J., Malanushenko, V., Ryabchikova, T. A., & Savanov, I. 2001, Astron. Astrophys, 375, 982Google Scholar
Alecian, G. & Stift, M. J. 2010, Astron. Astrophys, 516, A53Google Scholar
Aurière, M., Wade, G. A., & Silvester, J., et al. 2007, Astron. Astrophys, 475, 1053Google Scholar
Babcock, H. W. 1960, Astrophys. J., 132, 521CrossRefGoogle Scholar
Babel, J. 1992, Astron. Astrophys, 258, 449Google Scholar
Bagnulo, S., Wade, G. A., & Donati, J.-F., et al. 2001, Astron. Astrophys, 369, 889CrossRefGoogle Scholar
Briquet, M., Korhonen, H., & González, J. F., et al. 2010, Astron. Astrophys, 511, A71CrossRefGoogle Scholar
Elkin, V. G., Mathys, G., Kurtz, D. W., et al. Mon. Not. Roy. Astron. Soc., 402, 1883CrossRefGoogle Scholar
Folsom, C. P., Kochukhov, O., Wade, G. A., et al. 2010, Mon. Not. Roy. Astron. Soc., 407, 2383CrossRefGoogle Scholar
Folsom, C. P., Wade, G. A., & Kochukhov, O., et al. 2008, Mon. Not. Roy. Astron. Soc., 391, 901CrossRefGoogle Scholar
Hatzes, A. P. 1991, Mon. Not. Roy. Astron. Soc., 248, 487Google Scholar
Khokhlova, V. L., Rice, J. B., & Wehlau, W. H. 1986, Astrophys. J., 307, 768CrossRefGoogle Scholar
Khomenko, E. & Kochukhov, O. 2009, Astrophys. J., 704, 1218CrossRefGoogle Scholar
Kochukhov, O. 2006, Astron. Astrophys, 446, 1051CrossRefGoogle Scholar
Kochukhov, O., Adelman, S. J., Gulliver, A. F., & Piskunov, N. 2007, Nature Physics, 3, 526CrossRefGoogle Scholar
Kochukhov, O. & Bagnulo, S. 2006, Astron. Astrophys, 450, 763CrossRefGoogle Scholar
Kochukhov, O., Bagnulo, S., Wade, G. A., et al. 2004a, Astron. Astrophys, 414, 613CrossRefGoogle Scholar
Kochukhov, O., Drake, N. A., Piskunov, N. & de la Reza, R. 2004b, Astron. Astrophys, 424, 935CrossRefGoogle Scholar
Kochukhov, O., Piskunov, N., & Ilyin, I., et al. 2002, Astron. Astrophys, 389, 420CrossRefGoogle Scholar
Kochukhov, O., Piskunov, N., Sachkov, M., & Kudryavtsev, D. 2005, Astron. Astrophys, 439, 1093CrossRefGoogle Scholar
Kochukhov, O., Shulyak, D., & Ryabchikova, T. 2009, Astron. Astrophys, 499, 851Google Scholar
Kochukhov, O., Tsymbal, V., & Ryabchikova, T., et al. 2006, Astron. Astrophys, 460, 831CrossRefGoogle Scholar
Kochukhov, O. & Wade, G. A. 2010, Astron. Astrophys, 513, A13CrossRefGoogle Scholar
Landstreet, J. D. & Mathys, G. 2000, Astron. Astrophys, 359, 213Google Scholar
Leone, F. & Catanzaro, G. 2001, Astron. Astrophys, 365, 118CrossRefGoogle Scholar
Lüftinger, T., Kochukhov, O., & Ryabchikova, T., et al. 2010, Astron. Astrophys, 509, A71CrossRefGoogle Scholar
Michaud, G. 1970, Astrophys. J., 160, 641CrossRefGoogle Scholar
Michaud, G., Charland, Y., & Megessier, C. 1981, Astron. Astrophys, 103, 244Google Scholar
Mikulášek, Z., Krtička, J., & Henry, G. W., et al. 2008, Astron. Astrophys, 485, 585CrossRefGoogle Scholar
Piskunov, N. & Kochukhov, O. 2002, Astron. Astrophys, 381, 736Google Scholar
Polosukhina, N. S., Shavrina, A. V., & Hack, M., et al. 2000, Astron. Astrophys, 357, 920Google Scholar
Preston, G. W. 1974, ARA&A, 12, 257Google Scholar
Quinet, P., Argante, C., & Fivet, V., et al. 2007, Astron. Astrophys, 474, 307CrossRefGoogle Scholar
Ryabchikova, T., Piskunov, N., & Kochukhov, O., et al. 2002, Astron. Astrophys, 384, 545Google Scholar
Ryabchikova, T., Ryabtsev, A., Kochukhov, O., & Bagnulo, S. 2006, Astron. Astrophys, 456, 329Google Scholar
Ryabchikova, T., Sachkov, M., Kochukhov, O., & Lyashko, D. 2007, Astron. Astrophys, 473, 907CrossRefGoogle Scholar
Shorlin, S. L. S., Wade, G. A., & Donati, J.-F., et al. 2002, Astron. Astrophys, 392, 637CrossRefGoogle Scholar
Shulyak, D., Ryabchikova, T., Mashonkina, L., & Kochukhov, O. 2009, Astron. Astrophys, 499, 879Google Scholar
Stçpień, K. 2000, Astron. Astrophys, 353, 227Google Scholar
Wade, G. A., Aurière, M., & Bagnulo, S., et al. 2006, Astron. Astrophys, 451, 293CrossRefGoogle Scholar
Wade, G. A., Bagnulo, S., & Kochukhov, O., et al. 2001, Astron. Astrophys, 374, 265CrossRefGoogle Scholar