Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381l..51b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. L51-L53. Research supported by CNPq, CONIC
Astronomy and Astrophysics
Astrophysics
10
Helium, Magellanic Clouds, Red Giant Stars, Astronomical Photometry, Color-Color Diagram, Color-Magnitude Diagram, Globular Clusters, Ubv Spectra
Scientific paper
The number of Large Magellanic Cloud clusters with integrated UBV photometry has been increased by more than a factor of 4, now totaling 624 objects. A gap in the cluster distribution through the color-color diagram appears in the region of the equivalent SWB type IV. The amplitude of the gap is about 0.1 mag in both colors. The turnoff ages of a few clusters near the gap edges perfectly fit theoretical predictions of a red giant branch phase transition. This jump is due to the first appearance of stars suffering the helium flash, which form a bright and populous red giant branch that persists that the subsequent cluster evolution. As an additional result, evidence is found that Hodge 7 (SL 735) might be a classical globular cluster.
Bica Eduardo
Claria Juan J.
Dottori Horacio
Piatti Alberto
Santos Joao F. C. Jr.
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