Blazhko Effect

 

 

 

 

  • period modulation     10 - 500 d
  • amplitude modulation  0,1 > 0,7 mag
  • frequancey            ~40 - 50% of RRab stars
                          ~ 2 - 40% of RRc stars

Root Causes (hypothesis)

  • non linear higher oscillation
  • stellar magnetic field rotation
  • variable turbulent convection
  • tide effect of a comparision star
  • resonance between radial and nonradial modes
  • non linear higher oscillation
  • stellar magnetic field rotation
  • variable turbulent convection
  • tide effect of a comparision star
  • resonance between radial and nonradial modes

What people thinks to know

  • Fourer analysis shows 2-4 peaks, near pulsation frequency
  • Stars with Blazhko effect changes their period more often
  • Blazhko effect can disappear for a certain time
  • Probability of detection of depends on BP