Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pasp...88..677f&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 88, Oct.-Nov. 1976, p. 677-679.
Astronomy and Astrophysics
Astronomy
5
Emission Spectra, H Alpha Line, Hydrogen Clouds, Nebulae, Velocity Measurement, Astronomical Photography, Astronomical Spectroscopy, Density Distribution, Image Contrast, Spectrum Analysis, Stellar Evolution
Scientific paper
The note draws attention to a structural feature in the Orion nebula, consisting of a parachute-shaped object converging on 64 Orionis, noted on H alpha photographs of the Orion nebula taken with the 76-cm Allegheny refractor. The same feature shows up clearly on a photograph taken in 1909 with the Mount Wilson 152-cm reflector, and on a photograph taken with the Palomar 5-m reflector. Measurements made on these three plates indicate a possible expansion of the object of about 3.6 seconds of arc per century, corresponding to a tangential velocity of about 90 to 100 km/sec. If the expansion continued at a linear rate, an explosive event may have occurred approximately 900 years ago.
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