Titre du document

New spectral classifications with two or three parameters

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Nom du Corpus

AstroConcepts

Auteur(s)
  • D. Chalonge
Affiliation(s)
  • Institut d'Astrophysique, Paris, France
Résumé

A description is given of two new systems of stellar classification, which are applicable only to stars of early spectral type (O-G0).Each star is characterized by two or three well-defined parameters (the same parameters are used for all stars), and it is the numerical value of these parameters which enables stars to be differentiated.The first two parameters, which measure the size and position of the Balmer discontinuity, enable a classification to be established which is equivalent to that of Morgan, Keenan, and Kellman, but is capable of greater precision. The introduction of a third parameter, the absolute gradient in the photographic region, makes it possible to classify stars which could otherwise not be included in previous classifications (metallic-line A-type stars, population II, etc.).

Langue(s) du document
Anglais
Année de publication
1956
Revue

Vistas in Astronomy

Éditeur
Elsevier
Type de publication
journal
Type de document
research-article
Présence de XML structuré
Non
Version de PDF
1.4
Score de qualité du texte
8.088
Nom du concept
  • Interstellar reddening
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences exactes et technologie ; 3 - terre, ocean, espace ; 4 - geophysique externe
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics
Identifiant ISTEX
95126F6EF9B4C542C8FB210D826E59EB5F375D2E
ark:/67375/6H6-53G7XXRF-3
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