SuWt 2
SuWt 2 is a planetary nebula viewed almost edge-on 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. 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.
References
- ^ "PN SuWt 2". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 12, 2016.
- ^ "White Dwarf Lost in Planetary Nebula". HubbleSite. Retrieved December 12, 2016.
- ^ 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.
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