/ftp/cats/aliases/K/./KWK2007



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J/ApJ/657/241       Spectroscopy of Leo I red giants               (Koch+, 2007)
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	table2.dat
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Beginning of ReadMe : J/ApJ/657/241 Spectroscopy of Leo I red giants (Koch+, 2007) ================================================================================ Stellar kinematics and metallicities in the Leo I dwarf spheroidal galaxy. Wide-Field implications for galactic evolution. Koch A., Wilkinson M.I., Kleyna J.T., Gilmore G.F., Grebel E.K., MacKey A.D., Evans N.W., Wyse R.F.G. <Astrophys. J. 657, 241 (2007)> =2007ApJ...657..241K ================================================================================ ADC_Keywords: Galaxies, nearby ; Stars, giant ; Photometry ; Radial velocities ; Abundances, [Fe/H] Keywords: galaxies: abundances - galaxies: dwarf - galaxies: evolution - galaxies: individual (Leo I) - galaxies: kinematics and dynamics Abstract: We present low-resolution spectroscopy of 120 red giants in the Galactic satellite dwarf spheroidal (dSph) Leo I, obtained with GeminiN GMOS and Keck DEIMOS. We find stars with velocities consistent with membership of Leo I out to 1.3 King tidal radii. By measuring accurate radial velocities with a median measurement error of 4.6km/s, we find a mean systemic velocity of 284.2km/s with a global velocity dispersion of 9.9km/s. The dispersion profile is consistent with being flat out to the last data point. Description: One part of our observations was carried out in queue mode with the Gemini Multiobject Spectrograph (GMOS) at the 8m Gemini North telescope, Hawaii, over four nights between 2004 December and 2005 January. The other part of our data was obtained with the Deep Imaging Multi-Object Spectrograph (DEIMOS) at the 10m Keck II telescope. Leo I was observed on the DEIMOS multislit spectrograph on the Keck II telescope on 2005 February 6-8.