Английская Википедия:Gum Nebula
Шаблон:Expand Italian Шаблон:Infobox nebula The Gum Nebula (Gum 12) is an emission nebula that extends across 36° in the southern constellations Vela and Puppis. It lies approximately 450 parsecs from the Earth.[1] Hard to distinguish, it was widely believed to be the greatly expanded (and still expanding) remains of a supernova that took place about a million years ago. More recent research suggests it may be an evolved H II region. It contains the 11,000-year-old Vela Supernova Remnant, along with the Vela Pulsar.
The Gum Nebula contains about 32 cometary globules.[2] These dense cloud cores are subject to such strong radiation from O-type stars γ2 Vel and ζ Pup and formerly the progenitor of the Vela Supernova Remnant that the cloud cores evaporate away from the hot stars into comet-like shapes. Like ordinary Bok globules, cometary globules are believed to be associated with star formation.[3] A notable object inside one of these cometary globules is the Herbig-Haro object HH 46/47.
It is named after its discoverer, the Australian astronomer Colin Stanley Gum (1924–1960). Gum had published his findings in 1955 in a work called A study of diffuse southern H-alpha nebulae (see Gum catalog). He also published the discovery of the Gum Nebula in 1952 in the journal The Observatory. The observations were made with the Commonwealth Observatory.[4]
The Gum nebula was photographed during Apollo 16 while the command module was in the double umbra of the Sun and Earth, using high-speed Kodak film.[5]
Popular culture
The Gum Nebula is explored by the crew of the Starship Titan in the Star Trek novel Orion's Hounds.[6]
Gallery
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Clouds near the center of the Gum Nebula
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Cometary Nebulae 30, 31 and 38 in the Gum Nebula. It also contains HH 120.
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One of 4 images of the Gum Nebula photographed by Apollo 16 in 1972. AS16-127-20024.
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The Gum Nebula is visible as the faint large red nebula in this image.
See also
References
External links
- Шаблон:WikiSky
- APOD: Gum Nebula, with mouse over (2009.08.22)
- Galaxy Map: Entry for Gum 12 in the Gum Catalog Шаблон:Webarchive
- Galaxy Map: Detail chart for the Gould Belt (showing the location of Gum 12 relative to the Sun)
- Encyclopedia of Science: Entry for the Gum Nebula (erroneously called Gum 56)
- SouthernSkyPhoto.com
- ↑ Graham, J.A., 1986. Objects associated with low-mass star formation in the Gum nebula. The Astrophysical Journal, 302, pp.352-362.
- ↑ Zealey, W. J., Z. Ninkov, E. Rice, M. Hartley, & S. B. Tritton. 1983, ApL, 23, 119.
- ↑ Reipurth, B. 1983, A&A, 117, 183. Star formation in BOK globules and low-mass clouds. "I - The cometary globules in the GUM Nebula."
- ↑ Шаблон:Cite journal
- ↑ Apollo 16 Preliminary Science Report (NASA SP-315), 1972. Chapter 31, Astronomical Photography, Part A, Gum Nebula, Glactic Cluster, and Zodiacal Light Photography, by R. D. Mercer, L. Dunkelman, and Thomas K. Mattingly.
- ↑ Шаблон:Cite book
