Luminosity classification with the Washington system

Details Luminosity classification with the Washington system Luminosity classification with the Washington system

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..723g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Sept. 1984, p. 723-733.

Astronomy and Astrophysics

Astronomy

52

Dwarf Stars, Giant Stars, Late Stars, Stellar Composition, Stellar Luminosity, Stellar Spectrophotometry, G Stars, Metallicity, Star Clusters

Scientific paper

The DDO 51 filter has been added to the Washington photometric system. The strong surface gravity sensitivity of the Mg I "b" triplet and MgH bands which it monitors allows the system to easily discriminate between dwarfs and giants of late G and K spectral type. The system is especially suited as a membership criterion for abundance studies of distant cluster giants. The Mg index is insensitive to surface gravity variations among G giants. The metallicity sensitivity among giants is also relatively weak. Population I and II giants can be distinguished but no further differentiation is evident.

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