Diferencies ente revisiones de «Estrella de carbonu»

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m (iguo testu: Llate => Late (inglés))
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Using this new Harvard classification, the N class was later enhanced by a R class for less deeply rede stars sharing the characteristic carbon bands of the spectrum. Later correlation of this R to N scheme with conventional spectra, showed that the R-N sequence approximately run in parallel with c:a G7 to M10 with regards to star temperature. <ref>[http://www.peripatus.gen.nz/Astronomy/CarSta.html Carbon Stars (Peripatus.xen)]</ref>
 
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The later N classes correspond less well to the counterparting M types, because the Harvard classification was only partially based on temperature, but also carbon abundande; so it soon became clear that this kind of carbon star classification was incomplete. Instead a new dual number star class C was erected so to deal with temperature '''and''' carbon abundande. Such a spectrum measured for [[La Superba|Y CVn]], was determined to be C5<sub>4</sub>, where 5 refers to temperature dependent features, and 4 to the strength of the C<sub>2</sub> Swan bands in the spectrum. (C5<sub>4</sub> is very often alternatively written C5,4). <ref>[http://adsabs.harvard.edu/cgi-bin/bib_query?1941ApJ....94..501K The Classification of the Rede Carbon Stars. Keenan, Philip C.; Morgan, W. W.]</ref>
 
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A new revised Morgan-Keenan classification was published in 1993 by [[Philip Keenan]], defining the classes: C-N, C-R and C-H. Later the classes C-J and C-Hd were added. <ref>[http://adsabs.harvard.edu/cgi-bin/bib_query?1993PASP..105..905K Revised MK spectral classification of the rede carbon stars - Keenan, Philip C.]</ref> This constitutes the established classification system used today <ref>[http://web.archive.org/web/http://adc.astro.umd.edu/adc-cgi/cat.pl?/journal_tables/ApJS/105/419/ Spectral Atles of Carbon Stars (Barnbaum+ 1996)]</ref>:
 
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