The extragalactic distance scale. II. Distances of the nearest galaxies from primary indicators.
Abstract
The apparent and true distance moduli B and o = - AB of the Magellanic Clouds and M31 are derived from at least three of the primary indicators: LMC: = 18.74 - 0.43 = 18.31 + 0.15; A = 0.046 + 0.003 Mpc. SMC: = 18.93 - 0.31 = 18.62 + 0.15; A = 0.053 + 0.004 Mpc. M31: = 24.48 - 0.41 = 24.07 + 0.16; A = 0.651 + 0.053 Mpc. There is no significant, systematic disagreement between the different distance indicators. Distances to three other members of the Local Group, M33, NGC 6822, and IC 1613, are derived with lower precision from at least one primary and one or more secondary indicators: M33: = 24.61 - 0.31 = 24.30 + 0.20; A = 0.72 + 0.07Mpc. NGC 6822: =24.52 - 0.79 = 23.73 + 0.25; A = 0.56 + 0.07 Mpc. IC 1613: =24.23 - 0.21 = 24.02 + 0.25; A = 0.64 + 0.08 Mpc. As expected from the different treatment of galactic extinction, the adopted distance moduli are on the average 0.3 mag less than on the Sandage-Tammann scale based on Cepheids only, but agree closely with van den Bergh's mean values for the Local Group. Subject headings: cosmology - galaxies: general - galaxies: Magellanic Clouds
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1978
- DOI:
- 10.1086/156306
- Bibcode:
- 1978ApJ...223..730D
- Keywords:
-
- Astrometry;
- Cepheid Variables;
- Eclipsing Binary Stars;
- Magellanic Clouds;
- Distance;
- Light Curve;
- Novae;
- Supergiant Stars;
- Astrophysics;
- Distance Scale:Extragalactic;
- Distances:Galaxies;
- Distances:Local Group