The extragalactic distance scale. III. Secondary distance indicators.
Abstract
Several important secondary extragalactic distance indicators are calibrated. These indicators are: (1) the brightest blue or yellow Population I clusters in late-type galaxies, (2) the brightest globular clusters, (3) the brightest blue supergiants, (4) the brightest red supergiant variables at maximum light, (5) the brightest blue supergiant variables, (6) the diameters of the largest H II loops or rings, and (7) the velocity dispersion of H II regions. Zero points and errors for these secondary indicators are determined on the distance scale defined by six Local Group galaxies whose distances were previously derived from five calibrated primary indicators (novae, Cepheids, RR Lyrae stars, BA supergiants, and eclipsing variables).
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1978
- DOI:
- 10.1086/156344
- Bibcode:
- 1978ApJ...224...14D
- Keywords:
-
- Astrometry;
- Globular Clusters;
- Stellar Luminosity;
- Supergiant Stars;
- Variable Stars;
- Calibrating;
- Cosmology;
- Distance Measuring Equipment;
- H Ii Regions;
- Indicating Instruments;
- Nebulae;
- Astrophysics;
- Distance Scale:Extragalactic;
- Globular Clusters:Distance Indicators;
- H II Regions:Distance Indicators;
- Supergiants: Distance Indicators