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

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

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 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 - 11 Jan 2015

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