Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390l..13b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. L13-L16. Research supported by Anglo-
Astronomy and Astrophysics
Astrophysics
22
Interstellar Matter, Molecular Clouds, Nebulae, B Stars, O Stars, Stellar Winds, Ultraviolet Radiation
Scientific paper
Optical processing of deep IIIaF Schmidt plates of a primordial giant molecular cloud (GMC) is demonstrated revealing information regarding clump-interclump structure. A combination of photographic masking and image amplification is employed to compress emulsion middensities and distribute chemical fog throughout the thickness of the emulsion coating. A chain of clearly defined clumpy globules is noted outside the stellar-wind-evacuated cavity of the Rosette Nebula (NGC 2237-NGC 2246). The clumpy structure is theorized to be the result of interactions between the CO cloud and OB stars in NGC 2244. The GMC clumps are shown to be primordial based on evidence from the photoionization-etching scale sizes. The GMC is pervaded by an interclump molecular substrate, and the clumpy globules are of interest because they do not result from fragmentation of stellar-wind-driven shells.
Block David L.
Dyson John E.
Madsen Claus
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