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000002440 005__ 20160701171705.0
000002440 037__ $$aASTROimport-597
000002440 100__ $$aVerschueren, W.
000002440 245__ $$aTowards accurate radial velocities from early type spectra in the framework of an ESO key programme
000002440 260__ $$c1991
000002440 520__ $$aIn order to elucidate the internal kinematics in very young stellar groups, a dedicated machinery was set up, which made it possible to proceed from actual observations to reductions and correlation analysis to the ultimate derivation of early-type stellar radial velocities (RVs) with the requisite precision. The following ingredients are found to be essential to obtain RVs of early-type stars at the 1-km/s level of precision: high-resolution, high-S/N spectra covering a large wavelength range; maximal reduction of observational errors and the use of optimal reduction procedures; the intelligent use of a versatile cross-correlation package; and comparison of velocities derived from different regions of the spectrum in order to detect systematic mismatches between object and template spectrum in some of the lines. 
000002440 700__ $$a David, M.
000002440 700__ $$a Hensberge, H.
000002440 773__ $$c953-958$$pMemorie della Societa Astronomica Italiana$$v62$$y1991
000002440 85642 $$ahttp://esoads.eso.org/abs/1991MmSAI..62..953V
000002440 905__ $$apublished in
000002440 980__ $$aNONREF