The multiple-shell structure of the planetary nebula NGC 6751

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/170263· OSTI ID:5184889

Chu, You-Hua; Manchado, A; Jacoby, G H; Kwitter, K B ^[1]

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1. Illinois Univ., Urbana (United States) Inst. de Astrofisica de Canarias, La Laguna (Spain) Kitt Peak National Observatory, Tucson, AZ (United States) Williams College, Williamstown, MA (United States)

An intriguing bipolar mass outflow and a faint envelope were detected spectroscopically in the planetary nebula NGC 6751 by Gieseking and Solf (1986). To study the physical structure, deep CCD images of this nebula have been obtained which detect not only the morphological counterparts of the aforementioned features but also additional faint halos extending out to a much larger radius. Long-slit echelle spectra are obtained to determine the internal motion and radial velocity, as well as low-dispersion spectra to determine the physical condition and abundances of each feature in the whole nebula. NGC 6751 is apparently a multiple-shell nebula moving through a gas-rich environment. An He abundance difference between the planetary nebula and the ambient medium and an N/O abundance ratio enhancement in the forbidden N II-bright knots in the main nebula are found. From the physical structure of the shells in NGC 6751, information is derived about the average mass-loss rates at various stages. 32 refs.

• OSTI ID: 5184889
• Journal Information: Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 376; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHARGE-COUPLED DEVICES
ELEMENT ABUNDANCE
ELEMENTS
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HELIUM
IMAGES
IONIZED GASES
MASS TRANSFER
MORPHOLOGY
NEBULAE
NONMETALS
PARTICLE KINEMATICS
PLANETARY NEBULAE
RARE GASES
SEMICONDUCTOR DEVICES
SPECTROSCOPY
STAR EVOLUTION