Circumstellar dust

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Circumstellar dust is cosmic dust around a star. It can be in the form of a spherical shell or a disc, e.g. an accretion disk. Circumstellar dust can be responsible for significant extinction and is usually the source of an infrared excess for stars that have it. For some AGB stars, the dust is composed of silicate emissions while others contain the presence of other dust component.[1] According to a study, it is still uncertain whether the dust is a result of crystalline silicate or polycyclic aromatic hyrdrocarbon.[2] However, recent observations revealed that Vega-type stars display broad silicate emission.[2] It is suggested that the circumstellar dust components can depend on the evolutionary stage of a star and is related to the changes in its physical conditions.[3]

The motion of circumstellar dust is governed by forces due to stellar gravity and radiation pressure.

Circumstellar dust in the Solar System causes the zodiacal light.

See also[edit]

Sources[edit]

  • J. Mayo Greenberg, H. C. Van De Hulst. Interstellar Dust and Related Topics. Springer Science & Business Media, 2013. ISBN 9401026645.
  • Hans-Peter Gail, Erwin Sedlmayr. Physics and Chemistry of Circumstellar Dust Shells. Cambridge University Press, 2013. ISBN 0521833795.
  • K. S. Krishna Swamy. "Chapter 6: Circumstellar dust". Dust in the Universe: Similarities and Differences. World Scientific, 2005. ISBN 9812562931.
  • Marshall Dimsey Perrin. A High Angular Resolution Survey of Circumstellar Dust Around Herbig Ae/Be Stars. University of California, Berkeley, 2006. ISBN 1109923074.
  • Wilfred Henry Sorrell. A Theoretical Study of Circumstellar Dust Around Ae/Be Stars. University of Wisconsin--Madison, 1989.

References[edit]

  1. ^ Nakada, Y.; Honma, M.; Seki, M. (2003). Mass-Losing Pulsating Stars and their Circumstellar Matter: Observations and Theory. Dordrecht: Kluwer Academic Publishers. p. 258. ISBN 1402011628.
  2. ^ a b Käufl, Hans U.; Siebenmorgen, Ralf (2013). The Role of Dust in the Formation of Stars: Proceedings of the ESO Workshop Held at Garching, Germany, 11–14 September 1995. Berlin: Springer Science & Business Media. p. 170. ISBN 9783662225158.
  3. ^ Hony, Sacha (2003). Infrared Light on the Composition of the Dust Surrounding Carbon-Rich Stars. Amsterdam: Amsterdam University Press. p. 7. ISBN 9053566686.