ROSAT observations of the RSCVn binary sigma Geminorum

Z. Yi, O. Elgaroy, O. Engvold, Niels Jørgen Stenfeldt Westergaard

    Research output: Contribution to journalJournal articleResearchpeer-review


    X-ray observations of the RSCVn system sigma Geminorum have been undertaken with the ROSAT observatory. Several spectra of very good signal-to-noise ratio were obtained. Spectral fitting using metal abundances amounting to 50% of solar values reveal two temperature components at 2 MK and 12 MK. Previous EXOSAT observations showed another component at 40 MK. Particular interest is focused on the temporal variations of the X-ray emission. It is found that variations occur on time scales ranging from years to hours and minutes.
    Original languageEnglish
    JournalAstronomy and Astrophysics
    Issue number3
    Pages (from-to)791-796
    Publication statusPublished - 1997


    • X-rays
    • Coronae
    • Stars sigma Gem
    • Stars


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