Wikipedia

Nebula planeter

(Dialihkan dari Nebula planet)

Nebula planeter adalah sebuah emisi nebula yang terdiri dari cangkang gas terionisasi yang bersinar yang sedang mengembang yang dikeluarkan selama fase masa asimtotik dari beberapa jenis bintang dalam siklus akhir kehidupan bintang tersebut.[2]

Gambar sinar X Nebula mata kucing.
Formasi Nebula planeter.
NGC 6326, sebuah nebula planeter[1]

Istilah Nebula planeter sebenarnya berawal dari kekeliruan yang dilakukan oleh William Herschel (1784 atau 1785) karena jika dilihat melalui teleskop, objek-objek tersebut terlihat menyerupai awan (nebula) yang mirip dengan penampakan Uranus, planet yang telah ditemukan dengan teleskop oleh Herschel. Nama yang diberikan oleh Herschel ini kemudian diadopsi oleh para astronom dan tidak pernah berubah lagi, walaupun nebula planeter sama sekali tidak ada hubungannya dengan planet di sistem tata surya.[3]

Nebula planeter sering berisikan bintang, tetapi tidak terlihat adanya planet. Objek ini merupakan fenomena yang berumur cukup pendek, yakni beberapa puluh ribu tahun, dibandingkan dengan umur bintang yang bisa beberapa miliar tahun.

Referensi

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  1. ^ Miszalski et al. 2011
  2. ^ Frankowski & Soker 2009, hlm. 654–8
  3. ^ Hubblesite.org 1997

Sumber

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  • Gurzadyan, Grigor A. (1997), The Physics and dynamics of planetary nebulae, Springer, ISBN 978-3-540-60965-0 
  • Harpaz, Amos (1994), Stellar Evolution, A K Peters, Ltd., ISBN 978-1-56881-012-6 
  • Hora, Joseph L.; Latter, William B.; Allen, Lori E.; Marengo, Massimo; Deutsch, Lynne K.; Pipher, Judith L. (September 2004), "Infrared Array Camera (IRAC) Observations of Planetary Nebulae", Astrophysical Journal Supplement Series, 154 (1): 296–301, Bibcode:2004ApJS..154..296H, doi:10.1086/422820 
  • Hubble Witnesses the Final Blaze of Glory of Sun-Like Stars, Hubblesite.org, December 17, 1997, diarsipkan dari versi asli tanggal 2010-04-01, diakses tanggal 2008-08-09 
  • Huggins, W.; Miller, W. A. (1864), "On the Spectra of some of the Nebulae", Philosophical Transactions of the Royal Society of London, 154: 437–44, Bibcode:1864RSPT..154..437H, doi:10.1098/rstl.1864.0013 
  • Iliadis, Christian (2007), Nuclear physics of stars. Physics textbook, Wiley-VCH, hlm. 18, 439–42, ISBN 978-3-527-40602-9 
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  • Jordan, S.; Werner, K.; O'Toole, S. J. (March 2005), "Discovery of magnetic fields in central stars of planetary nebulae", Astronomy & Astrophysics, 432 (1): 273–9, arXiv:astro-ph/0501040  , Bibcode:2005A&A...432..273J, doi:10.1051/0004-6361:20041993 
  • Kiss, L. L.; Szabó, Gy. M.; Balog, Z.; Parker, Q. A.; Frew, D. J. (November 2008), "AAOmega radial velocities rule out current membership of the planetary nebula NGC 2438 in the open cluster M46", Monthly Notices of the Royal Astronomical Society, 391 (1): 399–404, Bibcode:2008MNRAS.391..399K, doi:10.1111/j.1365-2966.2008.13899.x 
  • Krause, Arthur (1961), Astronomy, Oliver and Boyd, hlm. 187 
  • Kwok, Sun (2000), The origin and evolution of planetary nebulae, Cambridge University Press, ISBN 0-521-62313-8  (Chapter 1 can be downloaded here Diarsipkan 2004-07-08 di Wayback Machine..)
  • Kwok, Sun (June 2005), "Planetary Nebulae: New Challenges in the 21st Century", Journal of the Korean Astronomical Society, 38 (2): 271–8, Bibcode:2005JKAS...38..271K, doi:10.5303/JKAS.2005.38.2.271 
  • Kwok, Sun; Su, Kate Y. L. (December 2005), "Discovery of Multiple Coaxial Rings in the Quadrupolar Planetary Nebula NGC 6881", The Astrophysical Journal, 635 (1): L49–52, Bibcode:2005ApJ...635L..49K, doi:10.1086/499332, We report the discovery of multiple two-dimensional rings in the quadrupolar planetary nebula NGC 6881. As many as four pairs of rings are seen in the bipolar lobes, and three rings are seen in the central torus. While the rings in the lobes have the same axis as one pair of the bipolar lobes, the inner rings are aligned with the other pair. The two pairs of bipolar lobes are likely to be carved out by two separate high-velocity outflows from the circumstellar material left over from the asymptotic giant branch (AGB) wind. The two-dimensional rings could be the results of dynamical instabilities or the consequence of a fast outflow interacting with remnants of discrete AGB circumstellar shells. 
  • Kwok, Sun; Koning, Nico; Huang, Hsiu-Hui; Churchwell, Edward (2006), Barlow, Michael J.; Méndez, ed., "Planetary nebulae in the GLIMPSE survey", Proceedings of the International Astronomical Union, Symposium #234, Planetary Nebulae in our Galaxy and Beyond, Cambridge: Cambridge University Press, 2 (S234): 445–6, Bibcode:2006IAUS..234..445K, doi:10.1017/S1743921306003668, Planetary nebulae (PNs) have high dust content and radiate strongly in the infrared. For young PNs, the dust component accounts for ∼1/3 of the total energy output of the nebulae (Zhang & Kwok 1991). The typical color temperatures of PNs are between 100 and 200 K, and at λ >5 μm, dust begins to dominate over bound-free emission from the ionized component. Although PNs are traditionally discovered through examination of photographic plates or Hα surveys, PNs can also be identified in infrared surveys by searching for red objects with a rising spectrum between 4-10 μm. 
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  • The first detection of magnetic fields in the central stars of four planetary nebulae, SpaceDaily Express, January 6, 2005, diakses tanggal October 18, 2009, Source: Journal Astronomy & Astrophysics 

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