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Hot subdwarfs in binary systems and the nature of their unseen companions

Authors: S. Geier, U. Heber, A. Tillich, H. Hirsch, H. Edelmann, V. Schaffenroth, T. Kupfer, S. Müller, P. F. L. Maxted, R. Østensen, P. Podsiadlowski, T. Marsh, B. Gänsicke, L. Morales-Rueda, G. Nelemans, R. Napiwotzki, E. W. Günther, L. Carone,

Publish Date: 2010/02/25
Volume: 329, Issue:1-2, Pages: 91-99
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A large fraction of the sdB stars reside in short period binaries. It is therefore clear that binary evolution plays an important role in the still unsolved problem of hot subdwarf formation. Here we present new results from different projects devoted to the analysis of sdBs in close binaries. The nature and masses of the unseen companions of 31 sdBs have been constrained by an analysis of high resolution spectra. In the course of this study candidate systems with massive compact companions have been discovered. The HYPERMUCHFUSS project aims at finding such systems making use of the huge spectral database of SDSS. A multi-site follow-up campaign of promising radial velocity variable sdBs started in 2009 and preliminary results are shown here. The most recent discovery of a substellar companion to the bright sdB HD 149382 may provide new evidence for the decisive role of low mass companions for sdB formation in general. A mysterious IR-excess has been detected, which may be caused by this otherwise invisible companion. Another low mass companion has been found to orbit the sdB star EGB 5 within 16.5 days. The space mission CoRoT is performing wide field and high precision photometry. First preliminary results from a spectroscopic survey of the COROT fields are also reported.



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Other Papers In This Journal:

  1. Hot subdwarfs in binary systems and the nature of their unseen companions
  2. The initial mass function in clusters: theoretical and observational perspectives
  3. Preliminary results for RR Lyrae stars and Classical Cepheids from the Vista Magellanic Cloud (VMC) survey
  4. Discrete Scale Relativity
  5. The formation of fragments at corotation in isothermal protoplanetary disks
  6. Radiation transfer through atmospheric aerosol media with anisotropic scattering
  7. Radiation transfer through atmospheric aerosol media with anisotropic scattering
  8. Effect of chorus normal angle on dynamic evolution of radiation belt energetic electrons
  9. The effects of the polytropic coefficient on plasma sheath in two cases isothermal and adiabatic ion thermal flow
  10. RAT0455+1305: another pulsating hybrid sdB star
  11. Some analytical models of anisotropic strange stars
  12. On the propagation of hydromagnetic waves in a plasma of thermal and suprathermal components
  13. Analysis of dark energy models in DGP braneworld
  14. Correlated observations and simulations on the buildup of radiation belt electron fluxes driven by substorm injections and chorus waves
  15. Large-scale collective motion of RFGC galaxies in curved space-time
  16. X-rays from the Symbiotic Star RX Pup
  17. Doubly-symmetric horseshoe orbits in the general planar three-body problem
  18. Clustering of non-point mass system of galaxies in the expanding Universe
  19. Einstein static universe on the brane supported by extended Chaplygin gas
  20. Chemistry in luminous AGN and starburst galaxies
  21. Einstein-Maxwell field equations in isotropic coordinates: an application to neutron star and quark star
  22. The life and death of star clusters
  23. Well-behaved relativistic charged super-dense star models
  24. The fraction and mid-infrared properties of broad absorption line quasars from the Sloan Digital Sky Survey
  25. Eclipsing Binaries in Open Clusters
  26. Collapsing plane symmetric source with heat flux and conformal flatness
  27. Study of the geoeffectiveness of coronal mass ejections
  28. Ion acoustic solitary and shock waves with nonextensive electrons and thermal positrons in nonplanar geometry
  29. Revisiting the open cluster Lo 807
  30. Dynamical behavior of size-graded dust grains levitated in rotating magnetized astroplasmas
  31. X-ray observations of PSR B0355+54 and its pulsar wind nebula

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