reflection nebula

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reflection nebula

A bright cloud of interstellar gas and dust that lies near and somewhat to one side of a star or stellar group, usually of spectral type B2 or later. The starlight is scattered in all directions by the dust grains, the density of which is sufficient to produce a noticeable illumination of the cloud. The light scattered toward the observer is bluer than that of the illuminating star but the spectra of cloud and star are essentially the same – a continuous spectrum with absorption lines. (If there is sufficient dust in an emission nebula, it will cause the stars' absorption spectra to be added to the normal emission spectrum of the nebula.) Reflection nebulosity is characteristic of young clusters and associations; the dust is dispersed in about 100 million years. Typical reflection nebulae occur around the brighter stars of the Pleiades. See also nebula.

reflection nebula

[ri′flek·shən ‚neb·yə·lə]
(astronomy)
A type of bright diffuse nebula composed mainly of cosmic dust; it is visible because of starlight from nearby stars or nebula stars that is scattered by the dust particles.
References in periodicals archive ?
Amateur observations of such reflection nebulae could seek to answer a number of questions.
In its center lie the bright bluish reflection nebulae NGC 6726 and IC 4812 and an unusual variable nebula, NGC 6729.
Hugging the southern horizon for most northern observers, Corona Australis boasts NGC 6541 (at far right), several reflection nebulae, and dark Bernes 157.
Unfortunately, they don't work on galaxies, star clusters, or reflection nebulae.
The bluish reflection nebulae that often appear adjacent to reddish emission nebulosity within the plane of the Milky Way, for instance, can contribute to a pleasing composition.
At 47x two small reflection nebulae southwest of IC 1284 blossom in the field of view.
A deep look into Orion's famous sword reveals a cascade of deep-sky targets from top to bottom, including the reflection nebulae NGC 1973/75/77, the bright emission nebulae M43 and M42, and tiny NGC 1999 at center, as well as many large, undesignated bands of gas and dust.
Reddish emission nebula IC 1284 in Sagittarius is paired with the blue reflection nebulae NGC 6590 and 6589.
NGC 2579 and ESO 370-9 have been confused with nearby objects and mistaken for reflection nebulae and planetary nebulae.
In an e-mail last year, British amateur Sakib Rasool suggested writing about young stellar objects with cometary reflection nebulae.
Both reflection nebulae are fairly bright in my 105-mm refractor at 76x.
Most reflection nebulae are quite faint in a small telescope, but vdB 1 is relatively bright through my 105-mm (4.