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Related Concept Videos

Forced Oscillations01:06

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...
Damped Oscillations01:07

Damped Oscillations

In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Frequency of Spring-Mass System01:17

Frequency of Spring-Mass System

One interesting characteristic of the simple harmonic motion (SHM) of an object attached to a spring is that the angular frequency, and the period and frequency of the motion, depend only on the mass and the force constant of the spring, and not on other factors such as the amplitude of the motion or initial conditions. We can use the equations of motion and Newton's second law to find the angular frequency, frequency, and period.
Consider a block on a spring on a frictionless surface. There...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Energy of a Satellite in a Circular Orbit01:11

Energy of a Satellite in a Circular Orbit

Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...

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Related Experiment Video

Updated: Jun 22, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Solar-like oscillations in a massive star.

Kévin Belkacem1, Réza Samadi, Marie-Jo Goupil

  • 1Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, CNRS (UMR 8109), Observatoire de Paris, Place J. Janssen, F- 92195 Meudon, France. kevin.belkacem@ulg.ac.be

Science (New York, N.Y.)
|June 23, 2009
PubMed
Summary

Researchers detected solar-like oscillations in a massive star, V1449 Aql, using data from the Convection Rotation and Planetary Transits mission. This finding advances stellar seismology by observing these oscillations in a large-amplitude pulsator.

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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
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Published on: September 20, 2017

Area of Science:

  • Stellar seismology
  • Asteroseismology
  • Stellar astrophysics

Background:

  • Stellar seismology uses oscillations to probe stellar interiors.
  • Acoustic oscillations are typically detected in the Sun and low-mass stars.
  • These oscillations are excited by turbulent convection.

Purpose of the Study:

  • To detect solar-like oscillations in a massive star.
  • To expand the study of stellar oscillations to more extreme stellar types.
  • To investigate the internal physics of massive pulsators.

Main Methods:

  • Utilized data from the Convection Rotation and Planetary Transits (CRTS) mission.
  • Analyzed light curve data to identify oscillation modes.
  • Applied techniques for detecting low-amplitude signals in stellar light curves.

Main Results:

  • Successfully detected solar-like oscillations in the massive star V1449 Aql.
  • V1449 Aql is identified as a large-amplitude beta Cephei pulsator.
  • The detected oscillations provide new insights into the interior of massive stars.

Conclusions:

  • Solar-like oscillations can be detected in massive stars, challenging previous assumptions.
  • This discovery opens new avenues for asteroseismology in massive, pulsating stars.
  • Further studies will refine our understanding of energy transport and internal structure in massive stars.