Release 11.12 ("Hergest Ridge")


Gclusters :: Bibliographic item "gc490"

Article ID: gc490
AuthorSandquist, Eric L.; Gordon, Mark; Levine, Daniel; Bolte, Michael
TitleA Re-evaluation of the Evolved Stars in the Globular Cluster M13
JournalThe Astronomical Journal, Volume 139, Issue 6, pp. 2374-2409
Year of publication2010 (on gclusters from 2015-11-20 10:26:50 )
AbstractWe have analyzed photometry from space- and ground-based cameras to identify all bright red giant branch (RGB), horizontal branch (HB), and asymptotic giant branch (AGB) stars within 10' of the center of the globular cluster M13. We identify a modest (7%) population of HB stars redder than the primary peak (including RR Lyrae variables at the blue end of the instability strip) that is somewhat more concentrated to the cluster core than the rest of the evolved stars. We find support for the idea that they are noticeably evolved and in the late stages of depleting helium in their cores. This resolves a disagreement between distance moduli derived from the tip of the RGB and from stars in or near the RR Lyrae instability strip...
TagsNGC 6205

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