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J/ApJ/836/202    Kinematic study of the Leo II dwarf galaxy    (Spencer+, 2017)

A multi-epoch kinematic study of the remote dwarf spheroidal galaxy Leo II. Spencer M.E., Mateo M., Walker M.G., Olszewski E.W. <Astrophys. J., 836, 202-202 (2017)> =2017ApJ...836..202S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Photometry, SDSS ; Spectroscopy ; Radial velocities ; Abundances, [Fe/H] ; Stars, giant Keywords: galaxies: abundances; galaxies: dwarf; galaxies: individual: Leo II; galaxies: kinematics and dynamics Abstract: We conducted a large spectroscopic survey of 336 red giants in the direction of the Leo II dwarf galaxy using Hectochelle on the Multiple Mirror Telescope, and we conclude that 175 of them are members based on their radial velocities and surface gravities. Of this set, 40 stars have never before been observed spectroscopically. The systemic velocity of the dwarf is 78.3±0.6km/s with a velocity dispersion of 7.4±0.4km/s. We identify one star beyond the tidal radius of Leo II but find no signatures of uniform rotation, kinematic asymmetries, or streams. The stars show a strong metallicity gradient of -1.53±0.10dex/kpc and have a mean metallicity of -1.70±0.02dex. Description: We used the 90prime imager on the 2.3m Bok telescope at Steward Observatory in Arizona to collect photometry of Leo II. Stars were observed in the Washington M and I filters during 2006 February. We calibrated these instrumental M and I magnitudes by transposing them to apparent g and i magnitudes of the Sloan Digital Sky Survey (SDSS). Spectroscopic observations were obtained with the Multiple Mirror Telescope (MMT) using Hectochelle. Spectra were taken on five different runs between 2006 and 2013. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 44 9309 Photometric properties of stars in the direction of Leo II table3.dat 76 471 Spectroscopic properties of stars in the direction of Leo II
See also: J/MNRAS/360/185 : VI photometry of the Leo II galaxy (Bellazzini+, 2005) J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006) J/ApJ/649/201 : Veloc. & Washington photom. in Carina dSph (Munoz+, 2006) J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006) J/MNRAS/378/318 : Chemical abundances in Leo I and II dSph (Bosler+, 2007) J/AJ/133/270 : Metallicities and ages in Leo II dSph (Koch+, 2007) J/AJ/134/566 : Leo II stellar kinematics (Koch+, 2007) J/MNRAS/388/1185 : JHKs photometry of LeoII dSph giants (Gullieuszik+, 2008) J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008) J/ApJ/675/201 : Radial velocities of stars near Leo I (Mateo+, 2008) J/AJ/137/3100 : Radial velocities of 4 dSph galaxies (Walker+, 2009) J/ApJS/191/352 : Abundances in stars of MW dwarf satellites (Kirby+, 2010) J/MNRAS/411/1013 : CaII triplet in Sextans dSph galaxy (Battaglia+, 2011) J/ApJ/741/100 : Proper motions of Leo II member stars (Lepine+, 2011) J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012) J/MNRAS/448/2717 : Bayesian analysis of resolved stellar spectra (Walker+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) 13- 22 F10.7 deg DEdeg Declination in decimal degrees (J2000) 24- 28 F5.2 mag gmag [15.9/23.7] The g band magnitude (SDSS system) 30- 33 F4.2 mag e_gmag [0.03/1.6] Uncertainty in gmag 35- 39 F5.2 mag imag [16.9/25.2] The i band magnitude (SDSS system) 41- 44 F4.2 mag e_imag [0.02/1.4] Uncertainty in imag
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 12- 20 F9.6 deg DEdeg Declination in decimal degrees (J2000) 22- 28 F7.2 d HJD Heliocentric Julian Date; JD-2450000 30- 35 F6.2 km/s RVel [-95.2/280.2] Radial velocity (likely members have 57.7<RVel<101.2km/s) 37- 40 F4.2 km/s e_RVel [0.1/3] Uncertainty in RVel 42- 45 I4 K Teff [4321/7317] Effective temperature 47- 49 I3 K e_Teff [21/975] Uncertainty in Teff 51- 54 F4.2 [cm/s2] log(g) [0.7/5.6] Log surface gravity 56- 59 F4.2 [cm/s2] e_log(g) [0.04/1.4] Uncertainty in log(g) 61- 65 F5.2 [Sun] [Fe/H] [-3.6/1.4] Metallicity 67- 70 F4.2 [Sun] e_[Fe/H] [0.02/1] Uncertainty in [Fe/H] 72 I1 --- Nobs [1/8] Number of observations 74 A1 --- Mm Member of Leo II; "Y"=Yes (289 occurrences; 175 unique sources); or "N" 76 A1 --- Comb Single ("S") or combined ("C") measurement
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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