X-Ray Dark Star
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High Quality Content by WIKIPEDIA articles! The visual star Betelgeuse appears to be always X-ray dark, an X-ray dark star. Betelgeuse is a red supergiant, and one of the largest and most visually luminous stars known. But, it is detectable in the ultraviolet, and is not an ultraviolet dark star. Like the red hypergiants and supergiants, hardly any X-rays are emitted by red giants. For normal A-type stars, like Vega (an A0V), there is a rather abrupt onset of X-ray emission around spectral type A7-F0, with a large range of X-ray luminosities developing across spectral class F. Chemically…mehr

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High Quality Content by WIKIPEDIA articles! The visual star Betelgeuse appears to be always X-ray dark, an X-ray dark star. Betelgeuse is a red supergiant, and one of the largest and most visually luminous stars known. But, it is detectable in the ultraviolet, and is not an ultraviolet dark star. Like the red hypergiants and supergiants, hardly any X-rays are emitted by red giants. For normal A-type stars, like Vega (an A0V), there is a rather abrupt onset of X-ray emission around spectral type A7-F0, with a large range of X-ray luminosities developing across spectral class F. Chemically peculiar stars of spectral type Bp or Ap are appreciable magnetic radio sources, most Bp/Ap stars remain undetected, and of those reported early on as producing X-rays only few of them can be identified as probably single stars.