Release 11.12 ("Hergest Ridge")

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Latest reference added in Gclusters (gc530)
AuthorKravtsov, V.; Alcaino, G.; Marconi, G.; Alvarado, F.
TitleWide-field multi-color photometry of the Galactic globular cluster NGC 1261
AbstractThis work studies in more detail the stellar population, including its photometric properties and characteristics, in the rarely studied southern Galactic globular cluster NGC 1261. We focus on the brighter sequences of the cluster's color-magnitude diagram. Like in our previous works, we rely upon photometry in several passbands to achieve more reliable results and conclusions (...) We found several signs of the inhomogeneity (“multiplicity”) in the stellar population. The most prominent of them are: (1) the dependence of the radial distribution of sub-giant branch (SGB) stars in the cluster on their U magnitude, with brighter stars less centrally concentrated at the 99.9% level than their fainter counterparts; (2) the dependence of the location of red giant branch (RGB) stars in the U-(U-B) CMD on their radial distance from the cluster center, with the portion of stars bluer in the (U-B) color increasing towards the cluster outskirts. Additionally, the radial variation of the RGB luminosity function in the bump region is suspected. We assume that both the SGB stars brighter in the U and the RGB stars bluer in the (U-B) color are probably associated with blue horizontal branch stars, because of a similarity in their radial distribution in the cluster. We estimated the metallicity of NGC 1261 from the slope of the RGB in U-based CMDs and the location of the RGB bump on the branch...
JournalAstronomy and Astrophysics, Volume 516, id.A23, 8 pp.
Year of publication2010
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TagsNGC 1261

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