The Pleiades eclipsing binary HD 23642 revisited

摘要: Context. HD 23642 is the only known eclipsing binary in Pleiades, and therefore of importance determining distance to this cluster. Aims. To use new photometric spectroscopic data combination with existing literature order improve determination parameters system, its reddening. Methods. New are presented for HD 23642. The “spectrally disentangled” using KOREL code. radial velocity simultaneously analysed FOTEL code obtain orbital solution derive fundamental two stars. reddening determined by fitting 7-colour Geneva, $B,V$ Stromgren colours, considering surface-brightness relations components $(B-V)$ c 1 -index. Results. preferred $138.0 \pm 1.5$ pc a $E(B-V) = 0.025 0.003$. value larger than 0.012 adopted recent works on stars Munari et al. (2004) Southworth (2005), smaller other values cluster agreement Pleiades. A comparison evolutionary models suggests that inclusion convective core overshoot gives much better fit empirical mass-radius relationship obtained from analysis. Both “spectral disentangling” consistent HD 23642 having [ Fe/H$]=+0.06$, most spectroscopical analyses Pleiades