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Nebula planeter

Dari Wikipedia bahasa Indonesia, ensiklopedia bebas
Gambar sinar X Nebula mata kucing.
Formasi Nebula planeter.
NGC 6326, sebuah nebula planeter[1]

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]

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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  • 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 
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  • 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. 
  • Liu, X.-W.; Storey, P. J.; Barlow, M. J.; Danziger, I. J.; Cohen, M.; Bryce, M. (March 2000), "NGC 6153: a super–metal–rich planetary nebula?", Monthly Notices of the Royal Astronomical Society, 312 (3): 585–628, Bibcode:2000MNRAS.312..585L, doi:10.1046/j.1365-8711.2000.03167.x 
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  • Miszalski, B.; Jones, D.; Rodriguez-Gil, P.; Boffin, H. M. J.; Corradi, R. L. M.; Santander-Garcia, M. (2011), "Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778", Astronomy and Astrophysics, 531: A158, Bibcode:2011A&A...531A.158M, doi:10.1051/0004-6361/201117084 
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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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