Английская Википедия:Abell 48
Шаблон:Short description Шаблон:Planetary nebula
Abell 48 is a planetary nebula likely located around 14,000 light years away[1] in the constellation of Aquila. It is noteworthy among planetary nebulae for hosting a rare WN-type Wolf-Rayet-type central star, a [WN4]-type star, which was once thought to be a bona-fide Wolf-Rayet star,[2] and received the name WR 120–6.[3] The nebula is made up of two rings surrounding the central star, and is heavily reddened, with an E(B-V) value of 2.14 and a visual extinction of 6.634 magnitudes, which is why it appears so dim.[4]
Properties
Assuming a distance of 1.9 kiloparsecs (about 6,200 light years), the nebula would have a diameter of 0.38 parsecs (~1.24 light years), and would be about 6,500 years old.[5] The central star, with an initial mass of approximately 3 solar masses, would have left the asymptotic giant branch (AGB) approximately 9,000 years ago. The central star of this nebula would be about 5,500 times brighter than the Sun, with a surface temperature of around 70,000 Kelvins and a size just under half that of the Sun.[4] However, this may be slightly inaccurate given the different distance suggested by Gaia, which is about 67% larger than the one used in the study to derive the aforementioned properties.[1]
References
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