THE CLUSTER AGES EXPERIMENT (CASE). V. ANALYSIS OF THREE ECLIPSING BINARIES IN THE GLOBULAR CLUSTER M4

We use photometric and spectroscopic observations of the eclipsing binaries V65, V66, and V69 in the field of the globular cluster M4 to derive masses, radii, and luminosities of their components. The orbital periods of these systems are 2.29, 8.11, and 48.19 days, respectively. Based on systemic ve...

Full description

Saved in:
Bibliographic Details
Published in:The Astronomical journal 2013-02, Vol.145 (2), p.43-13
Main Authors: Kaluzny, J., Thompson, I. B., Rozyczka, M., Dotter, A., Krzeminski, W., Pych, W., Rucinski, S. M., Burley, G. S., Shectman, S. A.
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BINARY STARS
COLOR
COMPARATIVE EVALUATIONS
DIAGRAMS
DISTANCE
ECLIPSE
EMISSION SPECTRA
EMISSION SPECTROSCOPY
LUMINOSITY
MASS
ORBITS
PHOTOMETRY
PROPER MOTION
STAR CLUSTERS
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We use photometric and spectroscopic observations of the eclipsing binaries V65, V66, and V69 in the field of the globular cluster M4 to derive masses, radii, and luminosities of their components. The orbital periods of these systems are 2.29, 8.11, and 48.19 days, respectively. Based on systemic velocities and relative proper motions, we show that all three systems are members of the cluster. We find that the distance to M4 is 1.82 + or - 0.04 kpc-in good agreement with recent estimates based on entirely different methods. We compare the absolute parameters of V66 and V69 with two sets of theoretical isochrones in mass-radius and mass-luminosity diagrams, and for assumed [Fe/H] = -1.20, [ alpha /Fe] = 0.4, and Y = 0.25 we find the most probable age of M4 to be between 11.2 and 11.3 Gyr. Age and distance determinations can be further improved when infrared eclipse photometry is obtained.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/145/2/43