Skip to main content
University of North Dakota
University of North Dakota
    • Email
    • Blackboard
    • Campus Connection
    • Employee Self-Service (HRMS)
    • Starfish
    • Degree Map
  • Directory
  • Calendar
  • Scope of this search:
College of Arts & Sciences
College of Arts & Sciences
  • About
  • Academics
  • Current Students
  • Faculty & Staff
  • Research
University of North Dakota
  • About
  • Academics
  • Current Students
  • Faculty & Staff
  • Research
  • Request Info
  • Visit
  • Apply
Scope of this search:
  • Request Info
  • Visit
  • Apply
Scope of this search:
College of Arts & Sciences
  • Home
  • Academics
  • Physics & Astrophysics
  • Colloquia
  • 2013 14
  • Colloquium: Dr. Geza Kovacs
Skip Section Navigation
  • Physics & Astrophysics
  • Courses
  • Scholarships
  • Research
  • Faculty & Staff
  • News & Events
  • Colloquia Show/hide children
    • 2017-2018
    • 2015-2016
    • 2014-2015
    • 2013-2014
    • 2012-2013

Colloquium: Dr. Geza Kovacs

Department of Physics and Astrophysics, University of North Dakota 

Nonlinear Stellar Pulsation

Friday, Feb 21, 2014 4:01pm-4:50pm

Finite-amplitude stellar pulsation is a natural outcome of the saturation of the excitation mechanism in pulsating stars that are self-excited due to the fortunate location of their partial ionization zones that drive the pulsation via the opacity mechanism. Although classical pulsating stars (Cepheids, RR Lyrae stars, Mira variables) are the simplest examples of nonlinear pulsation, it occurs at any (however small) amplitudes whenever the star is vibrationally unstable against infinitesimal perturbations. Here we review the basics of the numerical and analytical methods employed in this field. In spite of the success in understanding (and modelling) several phenomena (e.g., light curve distortion, Hertzsprung progression), current models are still unable to give satisfactory explanation for double/multi-mode pulsations and completely fail in giving a physically sound (and working) model for the very common phenomenon of amplitude modulation (the so-called Blazhko effect) in RR Lyrae stars.

Department of Physics & Astrophysics
Witmer Hall Room 213
101 Cornell St Stop 7129
Grand Forks, ND 58202-7129
P 701.777.2911
physics@UND.edu
  • Facebook
We use cookies on this site to enhance your user experience.

By clicking any link on this page you are giving your consent for us to set cookies, Privacy Information.

College of Arts & Sciences

Columbia Hall, Room 1930
501 N Columbia Rd Stop 8038
Grand Forks, ND 58202-8038

UND.artssci@UND.edu |  701.777.2749
  • Instagram
  • Facebook
  • Twitter
  • LinkedIn
  • Library
  • Essential Studies
  • One-Stop
  • Registrar
  • Bookstore
  • Contact UND
  • Campus Map
  • Employment
  • Tech Support
  • Make a Gift
University of North Dakota

© 2022 University of North Dakota - Grand Forks, ND - Member of ND University System

  • Accessibility & Website Feedback
  • Terms of Use & Privacy
  • Notice of Nondiscrimination
  • Student Disclosure Information
  • Title IX
©