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Rosat observations of pleiades flare stars

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Abstract

The X-ray data of a sample of 104 flare stars (FSs) in the Pleiades cluster region obtained by Stauffer et al. [1] on the basis of deep ROSAT PSPC observations are analyzed. If we divide the X-ray emission detected in late-type stars of the Pleiades cluster into FSs and non-FSs, we find that X-ray luminosities of stars of both groups can be considered as coming from the same parent population. Moreover, in order to classify stars in a sample of 23 late-type Pleiades stars of unknown nature discriminant analysis in a four-dimensional parameter space (log (Lx, log (Lx/Lbol), and ROSAT hardness ratios HR1 and HR2) has been used. It can be shown that the majority of these stars (16) are very likely FSs rather than non-FSs.

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Authors and Affiliations

  1. Byurakan Astrophysical Observatory, National Academy of Sciences, Republic of Armenia

    V. V. Hambaryan & L. V. Mirzoyan

  2. Landessternwarte Königstuhl, D-69117, Heidelberg, Germany

    R. Wichmann & J. Krautter

  3. Max-Plank-Institut fär Extraterrestische Physik, D-85740, Garching, Germany

    R. Neuhäuser

Authors
  1. V. V. Hambaryan
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  2. L. V. Mirzoyan
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  3. R. Wichmann
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  4. J. Krautter
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  5. R. Neuhäuser
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Published in Astrofizika, Vol. 40, No. 4, pp. 545–557, October-December, 1997.

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Hambaryan, V.V., Mirzoyan, L.V., Wichmann, R. et al. Rosat observations of pleiades flare stars. Astrophysics 40, 354–362 (1997). https://doi.org/10.1007/BF03036024

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  • DOI: https://doi.org/10.1007/BF03036024

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