Luminosity classification with the Washington system.
Abstract
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.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- September 1984
- DOI:
- 10.1086/131411
- Bibcode:
- 1984PASP...96..723G
- Keywords:
-
- Dwarf Stars;
- Giant Stars;
- Late Stars;
- Stellar Composition;
- Stellar Luminosity;
- Stellar Spectrophotometry;
- G Stars;
- Metallicity;
- Star Clusters;
- Astronomy