Spectroscopy of horizontal branch stars in NGC 6752

Details Spectroscopy of horizontal branch stars in NGC 6752 Spectroscopy of horizontal branch stars in NGC 6752

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..40...14c&link_type=abstract

ESO Messenger (ISSN 0722-6691), June 1985, p. 14-16.

Physics

Abundance, Color-Magnitude Diagram, Globular Clusters, Horizontal Branch Stars, Iue, Stellar Spectrophotometry, Balmer Series, Helium, Line Spectra

Scientific paper

IUE spectra were obtained for the HB stars in the globular cluster NGC 6752 in an attempt to characterize the helium abundance in Pop II objects. The He abundance in globular clusters, which are situated in the galactic halo, is thought to be similar to the abundance in the first three minutes of the Big Bang. A lower limit of 0.14 for the mass was calculated. The value is lower than predicted for primordial He, which may indicate that sedimentation is occurring in the 16,000 K region observed.

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