Radial-velocity measurements of the pulsating zirconium star: LS IV-14°116

C. S. Jeffery, A. Ahmad, N. Naslim, W. Kerzendorf

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The helium-rich hot subdwarf LS IV -14°116 shows remarkably high surface abundances of zirconium, yttrium, strontium, and germanium, indicative of strong chemical stratification in the photosphere. It also shows photometric behaviour indicative of non-radial g-mode pulsations, despite having surface properties inconsistent with any known pulsational instability zone. We have conducted a search for radial-velocity variability. This has demonstrated that at least one photometric period is observable in several absorption lines as a radial-velocity variation with a semi-amplitude in excess of 5 km s-1. A correlation between line strength and pulsation amplitude provides evidence that the photosphere pulsates differentially. The ratio of light to velocity amplitude is too small to permit the largest amplitude oscillation to be radial.

Original languageEnglish
Pages (from-to)1889-1894
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume446
Issue number2
DOIs
Publication statusPublished - Jan 11 2015
Externally publishedYes

Keywords

  • Asteroseismology
  • Stars: chemically peculiar
  • Stars: individual (LS IV-14°116)
  • Subdwarf

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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