Two compact planetary nebulae of moderate excitation - NGC 6565 (3-4. 5 deg) and NGC 6644 (8-7. 2 deg)

Journal Article · Mon Feb 01 00:00:00 EST 1988 · Publ. Astron. Soc. Pac.; (United States)

DOI:https://doi.org/10.1086/132155· OSTI ID:7129239

Aller, L H; Keyes, C D; Feibelman, W

Data obtained with an image-tube scanner at the 3-m Shane telescope are combined with IUE data to obtain plasma diagnostics and chemical compositions for two planetary nebulae of moderately high excitation. Theoretical nebular models were calculated using stellar fluxes given by Husfeld et al. (1984) for T(asterisk) = 85,000 K, log g = 4.72, and elemental abundances were obtained by fitting theoretical to observed line intensities and also by using the model to determine ionization correction factors to be applied to observed ionic concentrations. Although C appears to be about 1.5 times as abundant in NGC 6644 as in NGC 6565, N, O, Ne, S, Cl, and Ar are depleted by factors ranging from 2 to 6 in NGC 6644 as compared to NGC 6565. The high-velocity object, NGC 6644, was evidently made from a less metal-rich mixture than the sun. 45 references.

• Research Organization: California Univ., Los Angeles (USA); NASA, Goddard Space Flight Center, Greenbelt, MD (USA)
• OSTI ID: 7129239
• Journal Information: Publ. Astron. Soc. Pac.; (United States), Vol. 100
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PLANETARY NEBULAE
CHEMICAL COMPOSITION
PLASMA DIAGNOSTICS
ABUNDANCE
ION DENSITY
IONIZATION
MATHEMATICAL MODELS
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
NEBULAE
RADIATIONS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources