Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..271b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 271-279.
Astronomy and Astrophysics
Astronomy
44
Carbon Monoxide, Emission Spectra, Line Spectra, Molecular Gases, Planetary Nebulae, Stellar Envelopes, Angular Resolution, Astronomical Maps, Ionized Gases, Radio Astronomy, Very Long Base Interferometry
Scientific paper
Maps of the J = 1-0 emission line of CO toward the planetary nebula NGC 7027 are presented. The integrated intensity map shows that the circumstellar molecular envelope has a diameter-to-zero intensity of about 70 arcsec, corresponding to a linear size of 0.30 pc at a distance of 900 pc. The envelope has an axisymmetric clumpy appearance, with unresolved clumps having a size of less than 0.02 pc. Maps at the line center reveal a bright inner ring of CO emission which surrounds a central CO minimum coincident with the ionized gas. The neutral envelope possess axial symmetry which is aligned with the symmetry axis of the ionized nebula. It is inferred from the CO emission line morphology that (1) the molecular material is constraining the development of the ionized nebula; (2) the mass loss from the central star was neither spherically symmetric nor completely uniform in time; and (3) the molecular envelope contains significant structure on scales smaller than 5 arcsec.
Bieging John H.
Thronson Harley A. Jr.
Wilner David
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