Release 11.12 ("Hergest Ridge")

Gclusters :: Bibliographic item "gc406"

Article ID: gc406
AuthorAlcaino, G.; Wamsteker, W.
TitlePhotometry in the central region of the globular cluster NGC 7099
JournalAstronomy and Astrophysics Supplement Series, vol. 50, p. 141-146
Year of publication1982 (on gclusters from 2013-11-13 12:16:12 )
AbstractThe results of iris photometry in the UBV system on short exposure plates of M30 (NGC 7099) are discussed. The photometry is given for the bright stars within a radius of 10 to 90 arcsec from the cluster center. A factor-of-two deficiency of blue horizontal branch stars to red giant stars is found for the central part of the cluster, compared to similar evaluations made at a radius of 80 to 300 arcsec. These ratios render values of helium content which range from about 0.27 in the outer regions to about 0.12 in the central region.
CM diagram
TagsNGC 7099

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