Age of the Large Magellanic Cloud cluster NGC 2193

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165666· OSTI ID:5546035

Da Costa, G S; King, C R; Mould, J R

The age of the LMC star cluster NGC 2193 is estimated as 2.2 + or - 0.6 Gyr from CCD photometry that reaches below the cluster main-sequence turnoff. The cluster is thus another member of the large set of LMC red clusters that have ages in the range of 1 to 3 Gyr. The principal cause of uncertainty in the estimated age is uncertainty in the LMC distance modulus; at (m - M)0 = 18.2, the age is estimated as 2.5 + or - 0.4 Gyr, while at (m - M)0 = 18.7, the age is 1.8 + or - 0.4 Gyr. A metal abundance of (Fe/H) = -0.5 + or - 0.3 dex is deduced for NGC 2193 from the color of the cluster giant branch. The C-M diagram for the LMC field near NGC 2193 shows the commonly found population of intermediate age stars but, in this case, the diagram is clearly dominated by a population of older stars. Isochrone fits indicate an age for this older population in excess of 7 Gyr, with some indication of ages perhaps as old as 13 Gyr. This latter population is the oldest LMC field population yet dated. 52 references.

• Research Organization: Yale Univ. Observatory, New Haven, CT; California Institute of Technology, Pasadena
• OSTI ID: 5546035
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 321; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGE ESTIMATION
ALGORITHMS
CHEMICAL COMPOSITION
GALAXIES
LUMINOSITY
MAGELLANIC CLOUDS
MATHEMATICAL LOGIC
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
STAR CLUSTERS
STAR EVOLUTION