Effects of main-sequence mass loss on the turnoff ages of globular clusters

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Willson, Bowen, and Struck-Marcell have proposed that globular cluster main-sequence turnoff ages can be reconciled with the lower ages of the Galaxy and universe deduced from other methods by incorporating an epoch of early main-sequence mass-loss by stars of spectral types A through early-F. The proposed mass loss is pulsation-driven, and facilitated by rapid rotation. This paper presents stellar evolution calculations of Pop. II (Z = 0.001) mass-losing stars of initial mass 0.8 to 1.6 M/sub /circle dot//, with exponentially-decreasing mass loss rates of e-folding times 0.5 to 2.0 Gyr, evolving to a final mass of 0.7 M/sub /circle dot//. ... continued below

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Pages: 9

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Guzik, J.A. January 1, 1989.

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Willson, Bowen, and Struck-Marcell have proposed that globular cluster main-sequence turnoff ages can be reconciled with the lower ages of the Galaxy and universe deduced from other methods by incorporating an epoch of early main-sequence mass-loss by stars of spectral types A through early-F. The proposed mass loss is pulsation-driven, and facilitated by rapid rotation. This paper presents stellar evolution calculations of Pop. II (Z = 0.001) mass-losing stars of initial mass 0.8 to 1.6 M/sub /circle dot//, with exponentially-decreasing mass loss rates of e-folding times 0.5 to 2.0 Gyr, evolving to a final mass of 0.7 M/sub /circle dot//. The calculations indicate that a globular cluster with apparent turnoff age 18 Gyr could have an actual age as low as /approximately/12 Gyr. Observational implications that may help to verify the hypothesis, e.g. low C/N abundance ratios among red giants following first dredge-up, blue stragglers, red giant deficiencies, and signatures in cluster mass/luminosity functions, are also discussed.25 refs., 4 figs., 3 tabs.

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Pages: 9

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NTIS, PC A02/MF A01; OSTI; INIS; GPO Dep.; 1.

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  • 5. IAP astrophysics meeting on astrophysical ages and dating methods, Paris, France, 26-29 Jun 1989

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  • Other: DE89016784
  • Report No.: LA-UR-89-2962
  • Report No.: CONF-8906206-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5726962
  • Archival Resource Key: ark:/67531/metadc1092183

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 22, 2018, 1:40 p.m.

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Guzik, J.A. Effects of main-sequence mass loss on the turnoff ages of globular clusters, article, January 1, 1989; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1092183/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.