The ultraviolet spectrum of the high-field magnetic cataclysmic variable AR Ursae Majoris

D. W. Hoard*, Gary D. Schmidt, Paula Szkody, Lilia Ferrario, Oliver Fraser, Michael A. Wolfe, B. T. Gänsicke

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    We have obtained an ultraviolet spectrum covering the range 917-1182 Å of the high-field magnetic cataclysmic variable AR Ursae Majoris when the binary was in its typical low-accretion state. The data reveal an array of deep Zeeman absorption features due to hydrogen Lyα-Lyγ, including several transitions that are normally forbidden but become enabled in the strong electric fields that exist in the atmospheres of highly magnetic white dwarfs. Spectral models indicate a magnetic field strength and structure consistent with that determined from longer wavelength Hubble Space Telescope Space Telescope Imaging Spectrograph UV observations; that is, a dipole of strength ∼235 MG offset along its axis by ∼0.15 of the stellar radius.

    Original languageEnglish
    Pages (from-to)1894-1898
    Number of pages5
    JournalAstronomical Journal
    Volume128
    Issue number4
    DOIs
    Publication statusPublished - Oct 2004

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