circumstellar disk


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circumstellar disk

[‚sər·kəm¦stel·ər ′disk]
(astronomy)
A flattened cloud of gas or small particles that undergoes approximately circular motion about a star, and in which the material velocity is determined primarily by the balance of gravity and centrifugal force.
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Eduard Vorobyov describes the process of clump formation in circumstellar disks followed by their migration onto the star as "cannibalism on astronomical scales.
2012) High-resolution near-infrared polarimetry of a circumstellar disk around UX Tau A.
Both the star and its circumstellar disk possess magnetic fields.
One important consideration for planetary formation is the dispersal rate of the circumstellar disk of gas and dust around a host star.
The findings support the notion that at least some massive stars form as their smaller siblings do, by packing on infalling material from a circumstellar disk.
The observations, made using Hubble's imaging spectrograph and the Near Infrared Camera and Multi-Object Spectrometer (NICMOS), revealed a shadow sweeping across the circumstellar disk.
Last year, Tobin and his colleagues found a large circumstellar disk forming around a protostar in the initial phases of star formation.
After we ruled out the eclipse being due to a spherical star or a circumstellar disk passing in front of the star, I realized that the only plausible explanation was some sort of dust ring system orbiting a smaller companion-basically a 'Saturn on steroids,'" said Mamajek.
When European astronomers discovered this tiny stellar group about a year ago, they reported two low-mass stars that move in sync with Beta Pictoris, the first star for which astronomers had imaged a circumstellar disk.
gov/feature/jpl/nasas-k2-finds-newborn-exoplanet-around-young-star) NASA once likened to "trying to learn how people grow from babies to children to teenagers, by only studying adults" - astronomers are constantly on the lookout for young stars surrounded by a circumstellar disk, which, given time, can evolve into protoplanetary disks.
Olsen resolved the circumstellar disk that surrounds the nearby star Beta Pictoris using a 10-inch Newtonian reflector and a modified webcam.
Detailed computer simulations have shown us that the gravitational pull of a planet inside a circumstellar disk can perturb gas and dust, creating spiral arms," said Carol Grady, an astronomer with Eureka Scientific, Inc.