CCD photometry of Large Magellanic Cloud clusters. IV - The metal-rich, remote southern cluster LW 79

Details CCD photometry of Large Magellanic Cloud clusters. IV - The metal-rich, remote southern cluster LW 79 CCD photometry of Large Magellanic Cloud clusters. IV - The metal-rich, remote southern cluster LW 79

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..626m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 626-652.

Astronomy and Astrophysics

Astrophysics

27

Astronomical Photometry, Magellanic Clouds, Metallic Stars, Star Clusters, Stellar Evolution, Visual Photometry, Blue Stars, Charge Coupled Devices, Color-Magnitude Diagram, Error Analysis, Interstellar Extinction, Red Giant Stars, Tables (Data)

Scientific paper

LW 79 is a populous star cluster located in the remote southern part of the Large Magellanic Cloud. The authors present deep Johnson BV CCD photometry of 1230 stars and Cousins R photometry of 614 stars in and around this cluster. The V versus (B-V) color-magnitude (CM) diagram of LW 79 reveals a well-defined main sequence terminating at V ≈ 20.3 and (B-V) ≈ 0.43 and a well-populated red giant branch and red giant clump. Detailed comparisons of the CM diagram of LW 79 with those of NGC 752 and NGC 7789 suggest that the age, metallicity [Fe/H], and distance modulus of LW 79 are ≡2.0×109yr, -0.3±0.3, and 18.4±0.2, respectively. These values agree well with the results determined from comparisons of the main-sequence photometry of LW 79 with theoretical isochrones. Comparisons of the evolved stars in LW 79 with appropriate theoretical models suggest that significant uncertainties remain in accurately predicting post-He-flash stages of stellar evolution.

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