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J/AJ/135/2264       Stellar radial velocities in NGC 188     (Geller+, 2008)
WIYN open cluster study.
XXXII. Stellar radial velocities in the old open cluster NGC 188.
    Geller A.M., Mathieu R.D., Harris H.C., McClure R.D.
   <Astron. J., 135, 2264-2278 (2008)>
   =2008AJ....135.2264G
ADC_Keywords: Clusters, open ; Stars, blue ; Radial velocities

Keywords: binaries: spectroscopic - blue stragglers -
          open clusters and associations: individual (NGC 188)

Abstract:
    We present the results of our ongoing radial-velocity (RV) survey of
    the old (7Gyr) open cluster NGC 188. Our WIYN 3.5m data set spans a
    time baseline of 11 years, a magnitude range of 12≤V≤16.5
    (1.18-0.94M☉), and a 1° diameter region on the sky. With the
    addition of a Domain Astrophysical Observatory data set we extend our
    bright limit to V=10.8 and, for some stars, extend our time baseline
    to 35 years. Our magnitude limits include solar-mass main-sequence
    stars, subgiants, giants, and blue stragglers (BSs), and our spatial
    coverage extends radially to 17pc (∼13 core radii). For the WIYN data
    we present a detailed description of our data reduction process and a
    thorough analysis of our measurement precision of 0.4km/s for
    narrow-lined stars. We have measured radial velocities for 1046 stars
    in the direction of NGC 188, and have calculated RV membership
    probabilities for stars with ≥3 measurements, finding 473 to be
    likely cluster members.

Description:
    The Domain Astrophysical Observatory (DAO) data set contains multiple
    RV measurements of 77 stars within the magnitudes of 10.8≤V≤16
    covering dates from 1973 December through 1966 November.

    We have used the Hydra Multi-Object Spectrograph (MOS) on the WIYN
    3.5m telescope to conduct our ongoing WOCS RV survey of NGC 188 from
    1996 to the present.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       162     1046   Radial velocity data


See also:
 J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001)
 J/AJ/124/601  : Absolute positions & proper motions in NGC 188 (Platais+, 2002)
 J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003)
 J/A+A/461/509 : Membership and spectroscopy of IC 2391 (Platais+, 2007)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     PKM       WOCS (Platais et al. 2003, Cat. J/AJ/126/2922)
                               identification, <Cl* NGC 188 PKM NNNN> in Simbad
   6- 12  A7    ---     Sand      Sandage (1962ApJ...135..333S) identification (1)
  14- 17  I4    ---     DGV       ? Dinescu et al. (1996AJ....111.1205D) number,
                                 <Cl* NGC 188 DGV NNNN> in Simbad
  19- 23  I5    ---     SMV       Stetson et al. 2004 (Cat. J/PASP/116/1012) 
                               identification, <Cl* NGC 188 SMV NNNNN> in Simbad
  25- 26  I2    h       RAh       Hour of Right Ascension (J2000) (2)
  28- 29  I2    min     RAm       Minute of Right Ascension (J2000) (2)
  31- 36  F6.3  s       RAs       Second of Right Ascension (J2000) (2)
      37  A1    ---     DE-       Sign of Declination (J2000)
  38- 39  I2    deg     DEd       Degree of Declination (J2000) (2)
  41- 42  I2    arcmin  DEm       Arcminute of Declination (J2000) (2)
  44- 48  F5.2  arcsec  DEs       Arcsecond of Declination (J2000) (2)
  50- 55  F6.3  mag     Vmag      V band magnitude (2)
  57- 61  F5.3  mag     B-V       (B-V) color index (2)
  63- 64  I2    ---     NWIYN     Number of WIYN observations
  66- 67  I2    ---     NDAO      Number of DAO observations
  69- 75  F7.2  km/s    <RV>      Average radial velocity
  77- 78  I2    %       P(pm)     ? Proper-motion membership probability (2)
  80- 81  I2    %       P(rv)     ? Radial-velocity membership probability
      83  A1    ---     u_P(rv)   [-] Non-reliable P(rv) (3)
  85- 90  F6.2  ---     e/i       ? standard deviation to precision ratio (4)
      92  A1    ---     u_e/i     [-] Non-reliable e/i value (3)
  94- 96  A3    ---     Mm        Membership / binarity, see section 7.1 (5)
  98-162  A65   ---     Comm      Additional comment(s) (6)

Note (1): Sandage identification in Simbad:
   * I-NNN to III-NNN : <NGC 188 1NNN> to <NGC 188 3NNN>
   * V-NNN : <Cl* NGC 188 MT NNN> (McClure & Twarog 1977ApJ...214..111M)
   * J : <Cl* NGC 188 SAN J>
   * IV-NNN are not identified.
Note (2): Data from Platais et al. (2003, Cat J/AJ/126/2922).

Note (3): the minus sign (-) indicates that more observations
     are required to derive a reliable measurement.
Note (4): i.e. the radial velocity standard deviation (e) divided by our
     quoted precision (i).  See sections 5.2 and 7.2.
Note (5): Source classification code as follows:
    BLM = binary likely member
    BLN = binary likely non-member
    BM  = binary member
    BN  = binary non-member
    BU  = binary with unknown membership
    SM  = single member
    SN  = single non-member
    U   = unknown class
Note (6): The comments include:
   * Notes about the classifications: we use G for giant stars, 
     BS for blue stragglers, SB1 and SB2 for single- and double-lined 
     spectroscopic binaries, respectively, and RR for rapid rotators.
   * We define the rapid rotators as those stars whose CCF FWHM is >60km/s
     and are not observed to be an SB2 binary. 
     (Our mean FWHM for non-RR stars is 35km/s.)
   * We have also included the relevant IDs from the photometric and
     X-ray studies of the cluster, with the prefixes:
     V  = Zhang et al. (2002AJ....123.1548Z),
     WV = Kafka & Honeycutt (2003AJ....126..276K),
     X  =  Belloni et al. (1998A&A...339..431B), and
     GX =  Gondoin (2005, Cat. J/A+A/438/291)
     as well as certain short-period variable classifications from Zhang et
     al. (2002AJ....123.1548Z).
   * We caution the reader that the variability of cases where, for
     example, e/i<5 and only a few observations are available should 
     be considered uncertain.


History:
    From electronic version of the journal

References:
 von Hippel & Sarajedini    Paper I       1998AJ....116.1789V
 Sarajedini et al.          Paper II      1999AJ....118.2894S
 Sarajedini                 Paper III     1999AJ....118.2321S
 Barrado Y Navascues et al. Paper V       2001ApJ...549..452B
 Sills & Deliyannis         Paper VI      2000ApJ...544..944S
 Platais et al.             Paper VII     2001AJ....122.1486P Cat. J/AJ/122/1486
 Platais et al.             Paper VIII    2002AJ....124..601P Cat. J/AJ/124/601
 Grocholski & Sarajedini    Paper X       2002AJ....123.1603G
 von Hippel et al.          Paper XI      2002AJ....124.1555V
 Kafka et al.               Paper XV      2003AJ....126..276K
 Grocholski & Sarajedini    Paper XVI     2003MNRAS.345.1015G
 Platais et al.             Paper XVII    2003AJ....126.2922P Cat. J/AJ/126/2922
 Mathieu et al.             Paper XVIII   2004ApJ...602L.121M
 Sarajedini et al.          Paper XIX     2004AJ....127..991S
 Kafka et al.               Paper XX      2004AJ....127.1622K
 Hole et al.                Paper XXIV    2009AJ....138..159H
 Platais et al.             Paper XXVI    2007A&A...461..509P Cat. J/A+A/461/509
 Geller et al.              Paper XXXVI   2009AJ....137.3743G
 Geller et al.              Paper XXXVIII 2010AJ....139.1383G
 Anthony-Twarog et al.      Paper XXXIX   2010AJ....139.2034A
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    12-Jan-2011