/ftp/cats/aliases/K/./KJN2005



==========================================================================
J/MNRAS/356/89      sigma Ori low-mass stars                 (Kenyon+, 2005)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	members.dat nonmemb.dat uncert.dat catalog.dat flags.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/356/89
==========================================================================

drwxr-xr-x 9 cats archive 172 Nov 20 2013 [Up] drwxr-xr-x 2 cats archive 4096 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 514 Dec 19 2022 .message -r--r--r-- 1 cats archive 9196 Aug 26 2008 ReadMe -rw-r--r-- 1 cats archive 1022 Sep 19 2007 +footg5.gif -rw-r--r-- 1 cats archive 2980 Mar 5 2008 +footg8.gif -r--r--r-- 1 cats archive 1189229 Apr 5 2007 catalog.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 1530 Apr 5 2007 flags.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 6356 Mar 28 2006 members.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 253 Oct 6 2005 nonmemb.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 1413 Mar 28 2006 uncert.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/MNRAS/356/89 sigma Ori low-mass stars (Kenyon+, 2005) ================================================================================ Membership, binarity and accretion among very low-mass stars and brown dwarfs of the sigma Orionis cluster. Kenyon M.J., Jeffries R.D., Naylor T., Oliveira J.M., Maxted P.F.L. <Mon. Not. R. Astron. Soc., 356, 89-106 (2005)> =2005MNRAS.356...89K ================================================================================ ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Stars, dwarfs ; Radial velocities ; Equivalent widths ; Photometry Keywords: techniques: radial velocities - techniques: spectroscopic - stars: low-mass, brown dwarfs - stars: pre-main-sequence - open clusters and associations: individual: sigma Orionis Abstract: Intermediate-resolution (R 7000) spectroscopy is presented for 76 photometrically selected very low-mass (0.04<M<0.3M_sun_) candidate members of the young cluster around sigma Orionis (sigma Ori). More than two-thirds appear to be genuine cluster members on the basis that they exhibit Li I 6708AA absorption, weak Na I 8183/8195AA features and a radial velocity consistent with the cluster mean. Photometric selection alone therefore appears to be very effective in identifying cluster members in this mass range. Only six objects appear to be certain non-members; however, a substantial subset of 13 candidates have ambiguous or contradictory indications of membership and lack Li absorption. Together with an observed spread in the equivalent width of the Li absorption feature in the cooler stars of our sample, this indicates that there may be deficiencies in our understanding of the formation of this line in cool, low-gravity objects. Description: We observed the field around sigma Ori with the Wide Field Camera (WFC) on the 2.5-m Isaac Newton Telescope using Harris R and Sloan i filters on the nights of 1999 September 2730. Spectra were obtained with the Wide Field Fiber Optic Spectrograph (WYFFOS) mounted at the Nasmyth focus of the 4.2-m William Herschel Telescope during the nights of 1999 December 11 and 12.