/ftp/cats/aliases/M//MJO2008



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J/MNRAS/385/2210 lam Ori and sig Ori low-mass stars spectroscopy (Maxted+, 2008)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table2.dat table3.dat table4.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/385/2210
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Beginning of ReadMe : J/MNRAS/385/2210 Spectroscopy around lam Ori and sig Ori (Maxted+, 2008) ================================================================================ A survey for low-mass spectroscopic binary stars in the young clusters around sigma Orionis and lambda Orionis. Maxted P.F.L., Jeffries R.D., Oliveira J.M., Naylor T., Jackson R.J. <Mon. Not. R. Astron. Soc., 385, 2210-2224 (2008)> =2008MNRAS.385.2210M ================================================================================ ADC_Keywords: Stars, pre-main sequence ; Binaries, spectroscopic ; Radial velocities ; Spectroscopy Keywords: binaries: spectroscopic - stars: low-mass, brown dwarfs Abstract: We have obtained multi-epoch, high-resolution spectroscopy of 218 candidate low-mass stars and brown dwarfs (BDs) in the young clusters around lambda Ori and sigma Ori. We find that 196 targets are cluster members based on their radial velocity, the equivalent width of their NaI 8200 lines and the spectral type from their TiO band strength. We have identified 11 new binary stars among the cluster members based on their variable radial velocity and an additional binary from the variation in its linewidth and shape. Of these, six are double-lined spectroscopic binaries (SB2) where the components of the binary are of comparable brightness. The others are single-lined binaries (SB1) in which the companion is faint or the spectra of the stars are blended. There are three narrow-lined SB1 binaries in our sample for which the companion is more than 2.5mag fainter than the primary. Description: Radial velocities and spectral indices for 218 stars and brown dwarfs around sigma and lambda Orionis. Observations were obtained with the FLAMES/GIRAFFE multi-object spectrograph on ESO's VLT UT2 (Kueyen) telescope (programme ID 076.C_145). The equivalent width of the NaI 8200AA and the strength of the TiO 8442AA spectral features were measured from the median average spectrum. Radial velocities were measured by cross-correlation against a template spectrum of the brown dwarf star USco CTIO 055 at multiple epochs.