Published October 1979
| Version v1
Journal article
UBV photometry of RR Lyrae variables in the globular cluster NGC 6121 (M4)
Creators
- 1. Mount Stromlo and Siding Spring Observatories, Research School of Physical Sciences, The Australian National University
Description
Photometry in U, B, and V is reported for 11 RR Lyrae variables and 11 horizontal branch stars in the globular cluster NGC 6121 (M4). The variables cover the whole range of periods present. From the present data and Sturch's (1977) observations of 15 ab-type RR Lyraes the reddening E/sub B/-V=0.36 +- 0.02 mag and the metal abundance [Fe/H]=-1.0 +- 0.4 are derived. Detailed comparisons are made with the results of pulsation theory and the following physical quantities for the variables in M4 are derived: Y=0.28 +- 0.05 and M=0.6 +- 0.1 M/sub sun/ assuming that Mv=0.6 +- 0.1 mag
Additional details
Publishing Information
- Journal Title
- Astron. J.
- Journal Volume
- 84
- Journal Issue
- 10
- Series
- Astron. J.
- Journal Page Range
- 1542-1552
- ISSN
- 0004-6256
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 11515528
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- CHEMICAL COMPOSITION; INTERSTELLAR GRAINS; INTERSTELLAR SPACE; IRON IONS; PHOTOMETRY; RED GIANT STARS; STAR CLUSTERS; VARIABLE STARS
- Descriptors DEC
- ATOMIC IONS; CHARGED PARTICLES; GIANT STARS; IONS; PARTICLES; SPACE; STARS