Deep Helium-Mixing and the Ultraviolet Spectra of Hot Horizontal Branch Stars

Details Deep Helium-Mixing and the Ultraviolet Spectra of Hot Horizontal Branch Stars Deep Helium-Mixing and the Ultraviolet Spectra of Hot Horizontal Branch Stars

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8256l&link_type=abstract

HST Proposal ID #8256

Physics

Hst Proposal Id #8256 Hot Stars

Scientific paper

There is now good evidence that the luminosities and gravities of hot horizontal branch {HB} stars in globular clusters are not correctly described by canonical models of core helium- burning stars. Observations of HB stars in the critical temperature range 4.2 0 } could explain the observed Stroemgren u and logg anomalies, but would also predict distinctive UV spectra characterized by strong metal absorption lines. We propose to ascertain the degree to which radiative levitation affects the observational properties of blue HB stars by obtaining STIS low-dispersion UV spectra of 9 hot HB stars in NGC 6752. This will permit us to disentangle the effects of helium mixing and radiative levitation upon HB properties.

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