Cannabaceae

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SuWt 2
Emission nebula
Planetary nebula
Image of SuWt 2 taken from the Cerro Tololo Inter-American Observatory.
Observation data: J2000 epoch
Right ascension13h 55m 43.23s
Declination−59° 22′ 40.03″[1]
Distance6,500 ly
Apparent magnitude (V)11.52[1]
ConstellationCentaurus
DesignationsPN G311.0+02.4, DENIS J135543.2-592239, GSC 08676-01161, 2MASS J13554323-5922398, PK 311+02 2[1]
See also: Lists of nebulae


SuWt 2 is a planetary nebula viewed almost edge-on[2] in the constellation of Centaurus. It is believed that high UV radiation from an undiscovered white dwarf ionizes this nebula. Currently, there is a binary system consisting of two A-type main-sequence stars whose radiation is not sufficient to photo-ionize the surrounding nebula.[3] The nebula is easily obscured by the brighter star, HD 121228.

It has been suggested that it has a triple stellar system. One of them, which is more massive than other two A-type main-sequence stars, evolved rapidly and became a red giant, swallowing the other two stars, and produced the planetary nebula.[2]

References[edit]

  1. ^ a b c "PN SuWt 2". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 12, 2016.
  2. ^ a b "White Dwarf Lost in Planetary Nebula". HubbleSite. Retrieved December 12, 2016.
  3. ^ Danehkar, A.; Parker, Q. A.; Ercolano, B. (2013). "Observations and three-dimensional ionization structure of the planetary nebula SuWt 2". Mon. Not. R. Astron. Soc. 434 (2): 1513–1530. arXiv:1307.2974. Bibcode:2013MNRAS.434.1513D. doi:10.1093/mnras/stt1116.


source: https://en.wikipedia.org/wiki/SuWt_2

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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