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A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
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Second Order systems II

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Binary Fission

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Related Experiment Video

Updated: May 17, 2026

Bringing the Visible Universe into Focus with Robo-AO

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

An interacting binary system powers precessing outflows of an evolved star.

Henri M J Boffin¹, Brent Miszalski, Thomas Rauch

¹European Southern Observatory (ESO), Casilla 19001, Santiago, Chile. hboffin@eso.org

Science (New York, N.Y.)

|November 10, 2012

Summary

Binary star interactions, specifically a precessing accretion disk, likely explain the nonspherical shapes of planetary nebulae. This study confirms this scenario in the Fleming 1 system, suggesting it

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

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Published on: July 2, 2012

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Last Updated: May 17, 2026

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Area of Science:

Astronomy and Astrophysics
Stellar Evolution
Binary Star Systems

Background:

Stars typically appear spherical, but their ejected envelopes during the late stages of life, particularly in the planetary nebula phase, often exhibit nonspherical shapes.
Asymmetrical outflows are commonly observed in planetary nebulae, prompting investigation into their origins.

Purpose of the Study:

To investigate the role of binary star interactions in shaping planetary nebulae.
To confirm the proposed mechanism of a precessing accretion disk launching point-symmetric jets in the Fleming 1 system.

Main Methods:

Observational analysis of the Fleming 1 system.
Identification of a post-common-envelope binary nucleus.

Main Results:

The Fleming 1 system was confirmed to host a post-common-envelope binary nucleus.
This finding supports the hypothesis that binary interactions are responsible for the observed asymmetry in planetary nebulae.

Conclusions:

The presence of a post-common-envelope binary nucleus in Fleming 1 strongly favors the scenario of binary interactions causing asymmetrical outflows.
This mechanism is likely applicable to a wide range of other planetary nebulae systems exhibiting similar features.