Close up of Iris nebula and NGC7023 (Tim Hawkes)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Iris Nebula · NGC 7023

Close up of Iris nebula and NGC7023, Tim Hawkes

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Close up of Iris nebula and NGC7023

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Close up of Iris nebula and NGC7023

Newtonian LRGB image of Iris nebula at high resolution. The core of the L image was deconvolved and the relative brightness reduced using HDRM transformation in PixInsight.

The Iris nebula and HD200775, the illuminating star, are about 1400 light years distant. Radio astronomy suggests that the central star lies in a bi-lobed cavity stretching across an area 5 by 2.5 light-years in size that was likely carved out of the surrounding dust clouds during star formation.

HD 200775 is a Herbig Ae/Be star, mass ~ 10 suns and at a temp of ~ 17,000 K, a pre-main-sequence star that is still shrouded in an envelope of dust and gas that it formed from and still in the process of contracting. Herbig Ae/Be stars are associated with the reflection nebulae that they illuminate because these are part of their parent star-forming regions. HD 200775 is one of the brightest stars of this type yet discovered. The blue light of the star is reflected by the surrounding dust. The red regions near the centre consist of filaments of dust that emit broadband red light. The extended red emission (ERE) regions are a result of a type of phospholuminescent red light emission from particles of dust flooded by high-energy ultraviolet radiation. The Iris Nebula contains an unusually high amount of polycyclic aromatic hydrocarbons (PAHs) visible in IR and which may account for some of the orange hue of some of the dust clouds.

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Close up of Iris nebula and NGC7023

Close up of Iris nebula and NGC7023

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Close up of Iris nebula and NGC7023

Close up of Iris nebula and NGC7023

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