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ROSAT-WFC detection of the Lyman continuum flux of β CMa (B1 II–III) |
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| Authors: | J E Drew M G Hoare M Denby |
| Institution: | * Department of Physics, Astrophysics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK ** Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK |
| Abstract: | We report the first detection of Lyman continuum (≈ 600Å) emission from a non-degenerate star. The WFC on-board ROSAT detected emission from β CMa (B1 II–III) which has a very low interstellar column. Both Kurucz LTE line-blanketed and Mihalas NLTE un-blanketed model atmospheres can match the observed count rate within the very considerable absolute calibration errors. We also find very marginal evidence for variability, although not at the dominant period of the known optical pulsations. |
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