Abstract
view Abstract Citations (82) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Planetary Nebula in the Globular Cluster M15. O'Dell, C. R. ; Peimbert, M. ; Kinman, T. D. Abstract The results of a photographic spectrophotometric investigation of the nebulous object K648 in the globular cluster M15 are presented. On the basis of a discussion of the size, density, and mass it is shown that K648 represents a typical example of the planetary nebula phenomena. The relative abundances of hydrogen, helium, oxygen, and neon were determined. The oxygen abundance, relative to hydrogen, is deficient by a factor of 61 relative to the Sun. The helium abundance, N(He)/N(H) = 0.18 + 0 03 is compared with that found in field planetary nebulae, a very high-velocity planetary nebula, and the Orion Nebula. It is shown that strong arguments can be presented, supporting the hypothesis that the original helium content of the globular clusters was much higher than the very low values usually assumed. Publication: The Astrophysical Journal Pub Date: July 1964 DOI: 10.1086/147900 Bibcode: 1964ApJ...140..119O full text sources ADS | data products SIMBAD (3)
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