Rosat observations of pleiades flare stars |
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Authors: | V V Hambaryan L V Mirzoyan R Wichmann J Krautter R Neuhäuser |
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Institution: | 1. Byurakan Astrophysical Observatory, National Academy of Sciences, Republic of Armenia 2. Landessternwarte K?nigstuhl, D-69117, Heidelberg, Germany 3. Max-Plank-Institut f?r Extraterrestische Physik, D-85740, Garching, Germany
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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.
Published in Astrofizika, Vol. 40, No. 4, pp. 545–557, October-December, 1997. |
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