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SPECTROSCOPIC ANALYSES OF THE STELLAR PLANETARY NEBULAE K3-66, K3-67, AND K3-71
SHIN'ICHI TAMURA and RICHARD A. SHAW
Publications of the Astronomical Society of the Pacific
Vol. 99, No. 622 (December 1987), pp. 1264-1268
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678950
Page Count: 5
You can always find the topics here!Topics: Astronomical objects, Planetary nebulae, Helium, Radial velocity, Chemical abundances, Population II stars, Nebulae, Wavelengths, Ratios, Astronomical spectroscopy
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Three angularly small planetary nebulae, K3-66, K3-67, and K3-71, in the direction of the galactic anticenter were analyzed spectroscopically. Their small angular sizes, along with their densities and electron temperatures, suggest that they may be fairly distant. Their radial velocities deviate considerably from those expected from galactic circular motion. The chemical abundance diagnostic criteria developed by Peimbert (1983) show that K3-66 clearly belongs to Population II. K3-67 is the most interesting object of the three, in that it is enriched in helium and nitrogen, and therefore represents an additional example of a class like M1-9 and M1-6, which were examined by Shibata and Tamura (1985).
Publications of the Astronomical Society of the Pacific © 1987 The University of Chicago Press