Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pasp...88..574a&link_type=abstract
(Astronomical Society of the Pacific, Rudolph Minkowski Symposium, Berkeley, Calif., May 18-22, 1976.) Astronomical Society of t
Astronomy and Astrophysics
Astronomy
49
Astronomical Spectroscopy, Planetary Nebulae, Abundance, Density Distribution, High Resolution, Photographic Measurement, Temperature Distribution
Scientific paper
The paper reviews the current status of research on planetary nebulae, summarizing the main results of a continuing program of spectroscopic studies of planetary nebulae. Two aspects are included in this program: (1) photographic spectra with as high resolution as possible in the regions 3100 to 5100 A, (2) image-tube scanner observations with the 3-m telescope in the range 3700 to 8600 A. The objective of the program was to obtain as detailed diagnostic information as practical by observing each element in as many stages of ionization as possible, and to examine nebular regions of different excitation. Some detailed image-tube scans are shown as examples. Available data on abundances of eight elements in 28 objects are summarized. Evidence for variation of abundance of some elements with distance from the center is examined. Mention is made of some work on detection and measurement of planetaries in external galaxies.
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