NGC 2867
Template:Short description Template:Infobox nebula
NGC 2867 (also known as Caldwell 90) is an elliptical[1] Type II[2] planetary nebula in the southern constellation of Carina, just over a degree to the NNW of the star Iota Carinae.[3] It was discovered by John Herschel on April 1, 1834. Herschel initially thought he might have found a new planet, but on the following night he checked again and discovered it had not moved.[4] The nebula is located at a distance of Script error: No such module "convert". from the Sun.[5]
The central star of the nebula is of spectral type WC3[6] and is in the process of evolving into a white dwarf, having previously shed the atmosphere that created the surrounding nebula. It is now a hydrogen deficient GW Vir variable that is undergoing non-radial pulsations with an amplitude of less than 0.3 in magnitude. The star has an estimated temperature of Script error: No such module "val". with 5% of the radius of the Sun and is radiating 1,400 times the Sun's luminosity.[1]
The surrounding nebula is fairly typical but does shows carbon enrichment, which suggests the progenitor star was not massive but did pass through third dredge-up. The category of central star has excited a very high degree of ionization in the nebula.[2] The shape of the nebula appears somewhat elongated, which may indicate an interaction with the surrounding interstellar matter. The nebula halo may be a recombination of two separate halos, which could indicate a peculiar mass-loss history.[7]
References
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External links
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- The Hubble European Space Agency Information Centre – Hubble picture and information on NGC 2867
Template:Caldwell catalogue Template:NGC30 Template:Carina (constellation)