A Case Study of a WC Nucleus View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1989

AUTHORS

J. B. Kaler , R. A. Shaw , W. A. Feibelman

ABSTRACT

We have examined the extraordinarily rich WC spectrum of the nucleus of He 2–99, an object closely akin to BD +30°3639. In all, we log 25 lines in the UV (λ1240-λ1950; λ2550-λ3150) and 89 in the optical between λ3610 and λ7065 (including a small number of nebular features). We. provide a fundamental atlas for this class of star, wherein we give fluxes and identifications of the emission lines, including a detailed accounting of blends. The most powerful emissions are those of C III followed by C II and C IV. There is good indication that C I and even C V are present as well. Oxygen is well represented by 0 III; 0 II, 0 IV, and 0 V all appear present, but are generally confused by blends. Si III and Si IV appear, as do He I and He II. Other than N V, little case can be made for stellar nitrogen. The most serious barrier to analysis of the spectrum is the problem of coincidences and blends: there are few pure lines. Analysis of the nebular spectrum, which is severely contaminated by stellar line emission, indicates enrichment in carbon, but none in nitrogen. More... »

PAGES

313-313

Book

TITLE

Planetary Nebulae

ISBN

978-0-7923-0003-8
978-94-009-0865-9

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-009-0865-9_119

DOI

http://dx.doi.org/10.1007/978-94-009-0865-9_119

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034031561


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