A peculiar metal-rich star, HD 135485

Carrie Trundle, Philip Dufton, W.R.J. Rolleston, Robert Ryans, D.J. Lennon, N. Lehner

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Abstract

Local thermodynamic equilibrium (LTE) absolute and differential abundances are presented for a peculiar metal-rich B-type star, HD 135485. These suggest that HD 135485 has a general enrichment of similar to0.5 dex in all the metals observed (C, N, O, Ne, Mg, Al, Si, P, S, Cl, Ar, Sc, Ti, Cr, Mn, Fe and Sr), except for nickel. The helium enhancement and hence hydrogen deficiency can account for less than or equal to 0.2 dex of this enhancement of metals, with the additional enhancement probably being representative of the progenitor gas. However, some of the metals appear to have greater enhancements, which may have occurred during the star's evolution. The significantly larger nitrogen abundance coupled with a modest helium enhancement observed in HD 135485 indicates that carbon- nitrogen (CN) processed material has possibly contaminated the stellar surface. Neon and carbon enhancements may indicate that helium core flashes have also occurred in HD 135485. Some of the iron-group elements (viz. Mn and Ni) appear to have similar abundance patterns to that of silicon Ap stars, but it is uncertain how these abundance patterns formed if they were not present in the progenitor gas. From a kinematical investigation it is unclear whether this star formed in a metal-rich region as implied by its chemical composition. From its position in the Hertzsprung-Russell diagram, HD 135485 would appear to be an evolved star lying close to or on the horizontal branch.
Original languageEnglish
Pages (from-to)291-300
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume328
Issue number1
DOIs
Publication statusPublished - 21 Nov 2001

ASJC Scopus subject areas

  • Space and Planetary Science

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    Trundle, C., Dufton, P., Rolleston, W. R. J., Ryans, R., Lennon, D. J., & Lehner, N. (2001). A peculiar metal-rich star, HD 135485. Monthly Notices of the Royal Astronomical Society, 328(1), 291-300. https://doi.org/10.1046/j.1365-8711.2001.04872.x