Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207..471a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, April 1, 1984, p. 471-489.
Astronomy and Astrophysics
Astronomy
67
Globular Clusters, Planetary Nebulae, Ultraviolet Astronomy, Absorption Spectra, Abundance, Interstellar Extinction, Iue, Spectrophotometry, Stellar Magnitude, Stellar Temperature
Scientific paper
IUE observations of the planetary nebula K648 in the globular cluster M15 have been obtained, and the first determinations of the C abundance in the nebular envelope have been made. Improved measurements of fluxes in the optical nebular emission lines and in forbidden N II 6583 have been obtained. Semiforbidden C III 1908 and C II 2326 are strong nebular emission features and C IV 1549 is a broad stellar absorption feature. The nebular shell abundances include: (C/H) = +0.05; (N/H) = -1.5; (O/H) = -1.25; and (He/H) = -1.5. The large C abundance indicates enrichment by material which has been involved in He burning. The C IV absorption is interpreted as being due to a P Cygni feature. The stellar mass loss rate is about 2 x 10 to the -10th solar masses/yr. The ionized hydrogen mass is 0.011 solar mass. The central star has 3000 solar luminosities for an adopted effective temperature of 38,000 + or - 4000 K.
Adams Stefan
Auriere Michel
Howarth Ian D.
Seaton M. J.
Walsh Jonathan R.
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