Titre du document

Two-dimensional spectral classification of F stars through photoelectric photometry with interference filters

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Nom du Corpus

AstroConcepts

Auteur(s)
  • Bengt Strömgren
Résumé

A method of spectral classification of F stars through photo-electric photometry with interference filters is described. Two classification indices are determined, one measuring the strength of the H? line, the other the Balmer discontinuity. Both indices are practically uninfluenced by interstellar reddening.Results of observations with the 82-inch reflector of the McDonald Observatory in February and March, 1953, are compared with spectral classification by W. W. Morgan, with colour indices (B-V) on Harold Johnson's system, and with absolute magnitudes from trigonometric parallaxes and spectroscopic determinations.The photometric probable error (one observation) of a (B-V) value predicted from the two classification indices is ± 0m.006, corresponding to a probable error ±0·02 of a spectral class. The photometric probable error (one observation) of a predicted value of the visual of the visual absolute magnitude M? is ± 0m.18. The comparison with the data mentioned above indicates that the influence of cosmical scatter on the predicted (B-V) and M? values is small, or negligible.Applications in the study of galactic structure are very briefly discussed.

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
1.2
Score de qualité du texte
9.04
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 biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie ; 4 - agronomie. sciences du sol et productions vegetales
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics
Identifiant ISTEX
8187484D146BD9734CE5199D899C07DA1B0313F6
ark:/67375/6H6-M6NC0LF5-1
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