Solar & Stellar Convection

			Grid of 3D model atmospheres 1
			Grid of 3D model atmospheres 2
			Movies

Selected Publications of the AIP Stellar Physics group:

• Caffau, E., Ludwig, H.-G., Steffen, M., Freytag, B., Bonifacio, P.: 2010
  Solar chemical abundances determined with a CO5BOLD 3D model atmosphere
  Solar Phys. (in press)
  
  
• Steffen, M., Cayrel, R., Bonifacio, P., Ludwig, H.-G., Caffau, E.: 2010
  Convection and 6Li in the atmospheres of metal-poor halo stars
  In Light elements in the Universe,
  eds. C. Charbonnel, M. Tosi, F. Primas & C. Chiappini,
  Proc. IAU Symposium No. 268, IAU (in press)
  
  
• Steffen, M., Cayrel, R., Bonifacio, P., Ludwig, H.-G., Caffau, E.: 2010
  6Li in metal-poor halo stars: real or spurious?
  In Chemical Abundances in the Universe: Connecting First Stars to Planets,
  eds. K. Cunha, M. Spite, and B. Barbuy,
  Proc. IAU Symposium No. 265, (in press)
  
  
• Ludwig, H.-G., Caffau, E., Steffen, M., Bonifacio, P.,
  Freytag, B., Cayrel, R.: 2010
  Solar abundances and 3D model atmospheres
  In Chemical Abundances in the Universe: Connecting First Stars to Planets,
  eds. K. Cunha, M. Spite, and B. Barbuy,
  Proc. IAU Symposium No. 265, (in press)
  
  
• Ludwig, H.-G., Behara, N.T., Steffen, M., Bonifacio, P.: 2009
  Impact of granulation effects on the use of Balmer lines as temperature indicators
  Astron. Astrophys. 502, L1-L4
  
  
• Ludwig, H.-G., Samadi, R., Steffen, M., Appourchaux, T., Baudin, F.,
  Belkacem, K., Boumier, P., Goupil, M.-J., Michel, E.: 2009
  Hydrodynamical simulations of convection-related stellar micro-variability.
  II. The enigmatic granulation background of the COROT target HD49933
  Astron. Astrophys. 506, 167-173
  
  
• Caffau, E., Ludwig, H.-G., Steffen, M.: 2009
  Solar abundances and granulation effects
  In 3D views on cool stellar atmospheres: theory meets observation,
  eds. K.N. Nagendra, H.-G. Ludwig, P. Bonifacio,
  Memorie della Societa Astronomica Italiana, 80, 643
  
  
• Freytag, B., Allard, F., Ludwig, H.-G., Homeier, D., Steffen, M., Sharp, C.: 2009
  Convective mixing and dust clouds in the atmospheres of brown dwarfs
  In Cool Stars 15, AIP Conference Proceedings Vol. 1094, pp. 489-492
  
  
• Freytag, B., Allard, F., Ludwig, H.-G., Homeier, D., Steffen, M.: 2009
  Simulations of dust clouds in the atmospheres of substellar objects.
  Theory toddles after observations
  In 3D views on cool stellar atmospheres: theory meets observation,
  eds. K.N. Nagendra, H.-G. Ludwig, P. Bonifacio,
  Memorie della Societa Astronomica Italiana, 80, 670
  
  
• Ludwig, H.-G., Caffau, E., Steffen, M., Freytag, B., Bonifacio, P., Kucinskas, A.: 2009
  The CIFIST 3D model atmosphere grid
  In 3D views on cool stellar atmospheres: theory meets observation,
  eds. K.N. Nagendra, H.-G. Ludwig, P. Bonifacio,
  Memorie della Societa Astronomica Italiana, 80, 711
  
  
• Steffen, M., Ludwig, H.-G., Caffau, E.: 2009
  Micro- and macroturbulence derived from 3D hydrodynamical stellar atmospheres
  In 3D views on cool stellar atmospheres: theory meets observation,
  eds. K.N. Nagendra, H.-G. Ludwig, P. Bonifacio,
  Memorie della Societa Astronomica Italiana, 80, 731
  
  
• Steffen, M., Ludwig, H.-G., Steiner, O.: 2009
  Near-surface stellar magneto-convection: Simulations for the Sun and a metal-poor solar analog
  In Cosmic Magnetic Fields: from Planets, to Stars and Galaxies
  Proc. IAU Symposium 259, eds. K.G. Strassmeier, A.G. Kosovichev & J.E. Beckman, IAU, p. 233
  
  
• 
  Caffau, E., Ludwig, H.-G., Steffen, M., Ayres, T.R., Bonifacio, P., Cayrel, R., Freytag, B., Plez, B.: 2008,
  The photospheric solar oxygen project:
  I. Abundance analysis of atomic lines and influence of atmospheric models
  Astron. Astrophys. 488, 1031-1046
  
  
• Severino, G., Straus, T., Steffen, M.: 2008,
  Velocity and Intensity Power and Cross Spectra in Numerical Simulations of Solar Convection
  Solar Physics 251, 549-562
  
  
• Straus, T., Fleck, B., Jefferies, S.M., Cauzzi, G., McIntosh, S.W., Reardon, K., Severino, G., Steffen, M.: 2008,
  The Energy Flux of Internal Gravity Waves in the Lower Solar Atmosphere
  Astrophys. J. 681, L125-L128
  
  
• Cayrel, R., Steffen, M., Bonifacio, P., Ludwig, H.-G., Caffau, E.: 2008
  Overview of the lithium problem in metal-poor stars and new results on ⁶Li
  In Proc. 10th Symposium on Nuclei in the Cosmos (NIC X), PoS,
  Available online at http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=53
  
  
• Ludwig, H.-G., Steffen, M.: 2008,
  Hydrodynamical model atmospheres and 3D spectral synthesis
  in Precision Spectroscopy in Astrophysics,
  eds. N.C. Santos, L. Pasquini, A.C.M. Correia, and M. Romaniello
  ESO Astrophysics Symposia Series, Springer, p.133
  
  
• Nutto, C., Steiner, O., Schaffenberger, W., Steffen, M.: 2008
  Numerical Experiments with Magnetoacoustic Waves in the Solar Atmosphere
  Electronic Proceedings of the 12th European Solar Physics Meeting,
  ed. P. Hardi, Freiburg, Germany.
  
  
• 
  Cayrel, R., Steffen, M., Chand, H., Bonifacio, P., Spite, M., Spite, F.,
  Petitjean, P., L., Ludwig, H.-G., Caffau, E.: 2007,
  Line shift, line asymmetry, and the 6Li/7Li isotopic ratio determination
  Astronomy & Astrophysics 473, L37-L40
  
  
• 
  Wedemeyer-Böhm, S., Steffen, M.: 2007,
  Carbon monoxide in the solar atmosphere.
  II. Radiative cooling by CO lines
  Astron. Astrophys. 462, L31-L35
  
  
• 
  Steffen, M.: 2006,
  Radiative hydrodynamics models of stellar convection
  in Convection in Astrophysics,
  eds. F. Kupka, I.W. Roxburgh, & K.L. Chan
  Proc. IAU Symposium 239, p.36
  
  
• Kochukhov, O., Freytag, B., Piskunov, N., Steffen, M.: 2006,
  3-D hydrodynamic simulations of convection in A-stars
  in Convection in Astrophysics,
  eds. F. Kupka, I.W. Roxburgh, & K.L. Chan
  Proc. IAU Symposium 239, p.68
  
  
• Freytag, B., Steffen, M.: 2005,
  Numerical simulations of convection in A-stars
  In: The A-star puzzle, Proc. IAU Symposium No. 224,
  J. Zverko, J. Ziznovsky, S.J. Adelman & W.W. Weiss eds.,
  Cambridge University Press, p.139-147
  
  
• Steffen, M., Freytag, B., Ludwig, H.-G.: 2005,
  3D simulation of convection and spectral line formation in A-type stars
  IN: Proc. 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun,
  F. Favata, G.A.J. Hussain, B. Battrick eds., ESA Publications, p.985-988
  
  
• Wedemeyer-Böhm, S., Schaffenberger, W., Steiner, O., Steffen, M., Freytag, B., Kamp, I.: 2005,
  Simulations of magnetohydrodynamics and CO formation from the convection zone to the chromosphere
  IN: Proc. International Scientific Conference on Chromospheric and Coronal Magnetic Fields,
  eds. D. Innes, A. Lagg, S. Solanki, D. Danes, ESA SP-596, pp.117-122
  
  
• Freytag, B., Steffen, M., Dorch, B.: 2002,
  Spots on the surface of Betelgeuse. Results from new 3D stellar convection models
  Astron. Nachr. 323 3/4, 213-219
  
  
• Steffen, M., Holweger, H.: 2002,
  Line formation in convective stellar atmospheres.
  I. Granulation corrections for solar photospheric abundances
  Astronomy & Astrophysics 387, 258-270