The helium-to-hydrogen ratio of the UV-bright star Barnard 29 of Messier 13

Details The helium-to-hydrogen ratio of the UV-bright star Barnard 29 of Messier 13 The helium-to-hydrogen ratio of the UV-bright star Barnard 29 of Messier 13

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..134a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 134-136

Astronomy and Astrophysics

Astronomy

3

Asymptotic Giant Branch Stars, Atmospheric Models, Globular Clusters, Helium, Hydrogen, Ratios, Stellar Atmospheres, Stellar Spectrophotometry, Ultraviolet Astronomy, H Gamma Line, Iue, Mathematical Models, Metallicity, Spaceborne Astronomy, Stellar Models

Scientific paper

Barnard 29 is the most luminous UV-bright star of the globular cluster Messier 13. Comparison of its reddening corrected optical region spectrophotometry and IUE low dispersion fluxes and its H-gamma profile with the predictions of metal-poor model atmospheres having the metallicity of M 13 indicated Teff = 20250 K, log g = 3.15. Observations of He I lambda(4026) taken with echelle spectrograph of the Multi-Mirror telescope using a Reticon detector show that He/H = 0.055 +/- 0.020. Some astrophysical implications of this result are discussed.

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