Propeller Nebula Simeis 57 (Philippe Renaud)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg)

Propeller Nebula Simeis 57, Philippe Renaud

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Propeller Nebula Simeis 57

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Propeller Nebula Simeis 57

Simeis 57 (HS 191) is an optically bright nebula in the Cygnus X region with a peculiar appearance that suggests an outflow from a rotating source. Newly obtained observations and archival data reveal Simeis 57 as a low-density nebula with an east-to-west excitation gradient. The nebula is recognizable but not prominent in mid- and far-infrared images. In its direction, half a dozen small CO clouds have been identified . No luminous stars are embedded in these molecular clouds, nor are any obscured by them and no sufficiently luminous stars are found in the immediate vicinity of the nebula. Instead, all available data points to the evolved star HD 193793 = WR 140 (an O4-5 supergiant and WC7 Wolf–Rayet binary) as the source of excitation, notwithstanding its large separation of 50′, about 25 pc at the stellar distance of 1.7 kpc. Simeis 57 appears to be a part of a larger structure surrounding the HI void centered on HD 193793.

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Astrometry.net job	7906918
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Propeller Nebula Simeis 57

Propeller Nebula Simeis 57

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Propeller Nebula Simeis 57

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