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The helium-to-hydrogen ratio of the UV-bright star Barnard 29 of Messier 13 (1994)

Adelman, S. J. ; Philip, A. G. D. ; Aikman, G. C. L. ; [et al.]

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Publication Date: 2019-07-13

Description: 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 T(sub eff) = 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.

Keywords: ASTRONOMY

Type: Astronomy and Astrophysics (ISSN 0004-6361); 282; 1; p. 134-136

Format: text

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