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Speckle Observations of Composite Spectrum Stars. II. Differential Photometry of the Binary Components
Scardia, M.; Ginestet, N.; Prieur, J. -L. +6 more
Multicolor differential photometry measurements of the two components of 18 close binary stars, mostly composite spectrum stars, are presented. They are based on observations made at Pic du Midi Observatory with the speckle camera PISCO between 1993 and 1998. Optical bench experiments were also performed to assess the validity of the whole process…
Atomic Data and Spectral Line Intensities for S XI
Bhatia, A. K.; Landi, E.
Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for S XI. The configurations included are 2s22p2, 2s2p3, 2p4, 2s22p3l, and 2s22p4l (l=s, p, d), giving rise to 72 fine-structure levels in intermediate coup…