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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 81 128 Characteristics of the target stars
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 A1 --- Samp [GD] GMOS or DEIMOS sample identification 3- 7 I5 --- [KWK2007] Identification number 9- 10 I2 h RAh Hour of Right Ascension (J2000) 12- 13 I2 min RAm Minute of Right Ascension (J2000) 15- 19 F5.2 s RAs Second of Right Ascension (J2000) 20 A1 --- DE- Declination sign (J2000) 21- 22 I2 deg DEd Degree of Declination (J2000) 24- 25 I2 arcmin DEm Arcminute of Declination (J2000) 27- 31 F5.2 arcsec DEs Arcsecond of Declination (J2000) 33- 37 F5.2 mag Imag The I band magnitude 39- 42 F4.2 mag V-I The (V-I) color index 44- 48 F5.2 arcmin Rad Distance from LeoI center 50- 55 F6.2 km/s HRV Heliocentric radial velocity (2) 57- 61 F5.2 km/s e_HRV Error in HRV 63- 67 F5.2 --- R Tonry-Davis R-based error of HRV 69- 70 I2 --- S/N Signal-to-noise 72- 76 F5.2 [-] Fe/H ? Metallicity on Carretta & Gratton scale (3) 78- 81 F4.2 [-] e_Fe/H ? Error in Fe/H
Note (2): The velocities from both the GMOS and DEIMOS samples have been shifted to a common mean Note (3): On the reference scale of Carretta & Gratton (1997, Cat. J/A+AS/121/95).
History: * 06-Jan-2009: From electronic version of the journal * 31-Mar-2009: More accurate positions kindly supplied by the author (Andreas Koch); original positions were accurate to 1s in RA and 1arcsec in Dec only.
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Jan-2009
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