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Centro de Astrofísica da Universidade do Porto
XXVII General Assembly of the IAU
3-5 August 2009, Rio de Janeiro, Brazil

The Joint Discussion will be organized in three sessions. Contributions will include 20 and 30 minutes Invited Talks (IT), followed by 10 minutes Oral Contributions. All three sessions will end with a discussion.

Invited speakers:

  • Jonathan Braithwaite (Canadian Institute for Theoretical Astrophysics, Canada)
  • John Landstreet (University of Western Ontario, Canada)
  • Lyudmila Mashonkina (Institute of Astronomy, Moscow, Russia)
  • Gautier Mathys (European Southern Observatory)
  • Stephane Mathis (Observatoire Paris, France)
  • Jaymie Matthews (University of British Columbia, Canada)
  • Georges Michaud (Universite de Montreal, Canada)
  • Tanya Ryabchikova (Institute of Astronomy, Moscow, Russia)
  • Denis Shulyak (University of Vienna, Austria)
  • Gregg Wade (Royal Military College of Canada)
  • Werner Weiss (University of Vienna , Austria)



Monday, 3th August  
   
Session 1 - Pushing the limit of instrument capabilities
11:00-11:30IT 1Overview on CP stars
  W. Weiss
11:30-12:00IT 2Current ground-based observations of CP stars
  G. Mathys
12:00-12:30IT 3CP stars observed from space
  J. Matthews
12:30-14:00Lunch
   
14:00-14:30IT 4 GAIA impact on CP star research
  D. Shulyak
14:30-14:40 OC
Microvariability of line profiles in spectra of OB stars and their magnetic fields
  A. Kholtygin
14:40-14:50 OC Continuous and Coherent radio emission from the magnetospheres of MCP stars
  C. Trigilio
14:50-15:00 OC The Ap star and the ESA Gaia mission
  L. Eyer
15:00-15:30
Discussion - To what degree may complementary techniques contribute to the understanding of the CP phenomenon?
   Chair: L. Eyer
15:30-16:00Coffee break
   
Session 2 – A 3-D look into the atmosphere?
16:00-16:30IT 1Magnetic fields and chemical inhomogeneities in the upper layers of hot stars
  G. Wade
16:30-17:00IT 2Spectral Synthesis / atmospheric models
  L. Mashonkina
17:00-17:30IT 3Pulsations in the atmospheres of Ap stars / inversions
  T. Ryabchikova

Tuesday, 4th August

Session 2 (cont.)
11:00-11:10 OC The nature of the light variability of the silicon star HR 7224
  J. Krticka
11:10-11:20 OC Next Generation mapping of the magnetic fields and chemical spots of Ap stars
  J. Silvester
11:20-11:30 OC Three-dimensional mapping of chemical spots in the magnetic Ap star theta Aur
  O. Kochukhov
11:30-11:40 OC Understanding radial velocity pulsations observed in oscillating magnetic stars
  J. C. Sousa
11:40-11:50 OC Numerical simulation of line profile variation in roAp stars
  H. Shibahashi
11:50-12:00 OC Analysis of the spectrum transition star HR 3383
  G. M. Wahlgren
12:00-12:30
Discussion - Atomic data: what do we need as input? How confidently can we derive Global parameters of CP stars?
  Chair: G. M. Wahlgren
   
12:30Lunch
   
Wednesday, 5th August
   
Session 3 - CP and related phenomena in the context of Stellar Evolution
11:00-11:30IT 1The very interesting lives of intermediate mass stars
  J. Landstreet
11:30-12:00IT 2The origin and evolution of stellar magnetic fields
  J. Braithwaite
12:00-12:10 OC Magnetic fields of O and B stars: measurements, statistics and evolution
  A. Kholtygin
12:10-12:20 OC Stable magnetic equilibria in upper-main-sequence and degenerate stars
  A. Reisenegger
12:20-12:30 OC Pulsational crossover in Ap stars
  G. Mathys
  
12:30-14:00Lunch
   
14:00-14:10 OC CP Stars , Diamagnetic Effects (DME) and Dielectronic Recombinations (DER)
  Portnoy
14:10-14:40IT 3Stellar evolutionary models: effects of diffusion
  G. Michaud
14:40-15:10IT 4Dynamical processes in the radiation zones of rotating stars
  S. Mathis
15:10-15:20 OC Magnetism and rotation of Herbig Ae/Be stars
  E. Alecian
15:20-15:30 OC Strontium diffusion in atmospheres of CP stars
  G. Alecian 
  
15:30-16:00Coffee break
  
16:00-17:00
Discussion - What is the key to the diversity of CP phenomena? The roles of magnetic fields, rotation, diffusion, birth environment, and binarity.
   Chair: tbc
17:00-17:30
Final Discussion – Upcoming Challenges of CP star research
  
17:30End of the meeting