• SPS1: Close binaries with compact objects
• SPS2: Massive stars formation
• SPS3: Science with the Virtual Observatory
• SPS4: What powers AXPs and SGRs?
• SPS5: Minor merging as a driver of galaxy evolution
• SPS6: Space Projects
• SPS7: The Missing Baryons and the Warm-Hot Intergalactic Medium: Current State and Future Prospects
• SPS8: Astronomy Education and Public Outreach in Europe
• SPS9: Amateur & Professional Astronomers in Europe
• SPS10: European Astronomy: Moving Forward

SPS1: Close binaries with compact objects

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Conveners: Dmitry Bisikalo (Russia) / Klaus Werner (Germany)

Rationale

Close binaries (CB) are among the most interesting objects in modern astrophysics. First of all, it is because of their observational behavior. They provide us with various observational effects which bring many new questions to scientists interpreting observations and studying those objects theoretically. Compact objects in CBs are a unique laboratory to study a vast variety of fundamental physical processes in different fields of modern physics from mechanics and gas dynamics to quantum physics and relativity. The gas accretion running in CBs draws attention of many researchers from all over the world since it is one of the most energetic processes in the Universe.

Due to the breakthrough in technologies, new observational and computing facilities, we improved much our knowledge about close binaries and compact objects as black holes, neutron stars, and white dwarfs that may be their components. New observational techniques and facilities for all wavelength regions allow us to map directly or indirectly gas dynamic structures occurring in processes of gas accretion. Space-borne X-ray and UV facilities allow us to study the compact objects and their interaction with the accreted gas deeper to the level of the elementary particles interaction in high energies. We now have rather sophisticated numerical models of close binaries. Organizing this session we aim to bring together leading scientists studying close binaries with compact objects to share our knowledge, show newest achievements in observations, numerical modeling and theoretical considerations.

The key topics to be discussed during the session are:

- Observational challenges. This topic will be dedicated to the observational techniques and facilities, new questions which the latest observational results bring to theorists.

- Numerical methods to study close binaries. Here we propose to discuss recent achievements in numerical simulations of close binaries. These are gas dynamic models of accretion disks, sophisticated methods of quantitative spectral analyses of stellar spectra (white dwarfs, neutron stars, etc.) and spectra of accretion disks around compact objects. We also aim to discuss the interpretation of new-coming observational data.

- Accretion onto compact objects. The topic will cover a wide range of questions concerning accretion in the close binaries with compact objects.

The Session will include several 40-min talks to introduce the current problems, and typically 20-min talks giving new experimental and theoretical results. Invited speakers are:Prof. Anatol Cherepashchuk (Russia), Dr. Thorsten Nagel (Germany), Prof. Edward Sion (USA), Prof. Juri Poutanen (Finland).

Contact: Dmitry Bisikalo bisikalo@inasan.rssi.ru