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J/ApJ/675/201       Radial velocities of stars near Leo I    (Mateo+, 2008)

The velocity dispersion profile of the remote dwarf spheroidal galaxy Leo I: a tidal hit and run? Mateo M., Olszewski E.W., Walker M.G. <Astrophys. J., 675, 201-233 (2008)> =2008ApJ...675..201M
ADC_Keywords: Galaxies, nearby ; Radial velocities Keywords: galaxies: dwarf - galaxies: kinematics and dynamics - Local Group - techniques: radial velocities Abstract: We present new kinematic results for 387 stars near the Milky Way satellite dwarf spheroidal galaxy Leo I. Spectra were obtained with the Hectochelle multiobject echelle spectrograph on the MMT, centered in the optical near 5200Å. Description: The principal data of this paper consist of new radial velocity measurements derived from spectra obtained using the multifiber Hectochelle spectrograph on the MMT telescope. The observations were carried out during two nights dedicated to this project (2005 March 31/April 1 and April 2/3), and during parts of six separate nights of two Hectochelle "queue runs" in 2006 April and 2007 March/April. Candidate stars to be observed with Hectochelle were selected from the (I, V-I) color-magnitude diagram of Leo I derived from CCD data obtained with the Hiltner 2.4m Telescope at MDM Observatory in 2004 February, and for the outermost candidates, from data we obtained with the 90Prime camera on the Steward 2.3m telescope at Kitt Peak in 2006 February. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table5.dat 79 387 Summary of observations of Leo I targets
See also: J/MNRAS/378/318 : Chemical abundances in Leo I and II dSph (Bosler+, 2007) J/ApJ/657/241 : Spectroscopy of Leo I red giants (Koch+, 2007) J/ApJ/663/960 : Radial velocities of Leo I stars (Sohn+, 2007) Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequential number (1) 4 A1 --- f_Seq [n+*] Problematic stars (2) 6- 11 F6.1 arcsec R Distance from center (3) 13- 17 F5.1 deg PA [-90/360] Position angle relative to center with PA(north)=0° and PA(east)=90° (3) 19- 24 F6.1 km/s HV Heliocentric velocity 26- 28 F3.1 km/s sigma Velocity dispersion 30- 31 I2 h RAh Right ascension (J2000) 33- 34 I2 min RAm Right ascension (J2000) 36- 40 F5.2 s RAs Right ascension (J2000) 42 A1 --- DE- Declination sign (J2000) 43- 44 I2 deg DEd Declination (J2000) 46- 47 I2 arcmin DEm Declination (J2000) 49- 52 F4.1 arcsec DEs Declination (J2000) 53 A1 --- n_Pos [n] Note on Position (2) 55- 59 F5.2 mag Imag I magnitude 61- 64 F4.2 mag V-I V-I colour index 66- 76 A11 --- r_HV Source of velocity (4) 78- 79 I2 --- MOV98 ? Star number in Mateo et al. 1998AJ....116.2315M (<[MOV98] NNN> in Simbad)
Note (1): Star identification number, ordered by increasing radial distance from the center of Leo I (R). Stars with heliocentric velocities in the range 250-320km/s are treated as nonmembers in our analysis. Stars named <[MOW2008] NNN> in Simbad. Note (2): Notes as follows: n = Star 52 in this table was not identified in our new photometry because it fell in a gap between 90Prime CCDs. Its equatorial coordinates are taken directly from Mateo et al., 1998AJ....116.2315M and may be offset by 2"-3" relative to the coordinates of all other stars in the table. + = possible "false positives" where we may have obtained the velocity of the sky at the time of observation rather than an actual target star (see Fig. 9 and Sect. 3.2). * = possible binary stars based on velocity variability (see Fig. 11 and Sect. 3.4 and 4.1). Note (3): R and PA are defined relative to the adopted center of Leo I: 10:08:27+12:18:30(J2000) (Mateo, 1998ARA&A..36..435M). This center position differs somewhat from the one used by Mateo et al., 1998AJ....116.2315M, and from the center coordinate given by Irwin and Hatzidimitriou, 1995MNRAS.277.1354I. Note (4): The sources of the velocities used to estimate the mean velocity listed in this table are coded as follows: ------------------------------------------------------------------------ Configuration UT Date Start/End ET(s) Nexp RA (J2000.0) DE ------------------------------------------------------------------------ 1 = Leo I/c1 2005 Mar 31 03:03/07:18 16200 6 10 08 35.7, +12 16 49 2 = Leo I/c2 2005 Apr 2 02:56/06:13 14400 4 10 08 15.5, +12 20 57 3 = Leo I/c3 2006 Apr 19 04:57/07:45 10000 4 10 08 23.2, +12 21 32 4 = Leo I/c4 2006 Apr 20 04:29/06:35 7500 3 10 08 40.0, +12 16 29 5 = Leo I/c5 2006 Apr 24 03:34/05:52 8100 3 10 08 25.9, +12 18 36 6 = Leo I/c6 2007 Mar 12 06:44/09:00 8100 3 10 08 24.5, +12 18 24 7 = Leo I/c7 2007 Apr 22 03:53/06:20 8100 3 10 08 24.5, +12 18 24 ------------------------------------------------------------------------ 8 = Mateo et al., 1998AJ....116.2315M
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Jul-2010
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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