The nature of V645 Cygni = CRL 2789

Astronomy and Astrophysics – Astronomy

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Microwave Spectra, Nebulae, Stellar Evolution, Stellar Spectra, Stellar Winds, Condensation, Cosmic Dust, Millimeter Waves, O Stars, Polarization Characteristics, Radio Sources (Astronomy), Stellar Spectrophotometry

Scientific paper

The rocket-infrared source CRL 2789 coincides with a nebulous object containing a starlike condensation known as V645 Cyg. The nebula shows strong optical polarization. It is interpreted as a bipolar nebula whose central star is invisible directly but whose existence is indicated by scattering from the nebulae. Radio continuum emission is detected at millimeter wavelengths, which is consistent with a free-free spectrum. The system contains an O7 star with a substantial stellar wind, is 6 kpc distant from earth, and consists of a nebulosity with a mean density of 4000 per cu cm containing much denser condensations in which dust grains may be forming. In evolutionary terms, CRL 2789 is a young object.

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