The peculiar X-ray and radio star AS431

Jean Pierre Caillault, Gary A. Chanan, David J. Helfand, Joseph Patterson, John A. Nousek, Leo O. Takalo, Gregory D. Bothun, Robert H. Becker

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25 Scopus citations


During a systematic survey of X-ray flux-limited late-type stars 1,2, we have rediscovered a highly reddened emission-line star, previously listed3 as AS431, which sheds light on whether both radio and X-ray emission from the winds of very hot stars can be non-thermal in origin. We report here Einstein observations revealing that AS431 has a highly absorbed X-ray spectrum and a relatively strong intrinsic flux of≥ 5 × 10-12 erg cm-2 s-1, and observations at 20 cm and 6 cm with the National Radio Astronomy Observatory Very Large Array (VLA), showing that it is also a moderately strong radio source ( ∼ 35 mJy). These data, together with optical and infrared observations, suggest a model in which both the radio and X-ray emissions arise in a chaotic stellar wind emerging from a single luminous Wolf-Rayet star.

Original languageEnglish (US)
Pages (from-to)376-378
Number of pages3
Issue number6001
StatePublished - 1985

All Science Journal Classification (ASJC) codes

  • General


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