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J/MNRAS/377/1737    BVI photometry of NGC 2489               (Piatti+, 2007)
CCD BVI photometry and Coravel observations of stars in the open cluster
NGC 2489.
    Piatti A.E., Claria J.J., Mermilliod J.-C., Parisi M.C., Ahumada A.V.
   <Mon. Not. R. Astron. Soc., 377, 1737-1746 (2007)>
   =2007MNRAS.377.1737P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI

Keywords: techniques: photometric - stars: kinematics -
          open clusters and associations: general -
          open clusters and associations: individual: NGC 2489

Abstract:
    We present CCD BVI photometry for the southern open cluster NGC 2489
    and its surrounding field. The sample consists of 2182 stars measured
    in an area of 13.6'x13.6', extending down to V∼21.5. These
    data are supplemented with CORAVEL radial-velocity observations for
    seven red giant candidates. A cluster angular radius of 6.7±0.6',
    equivalent to 3.5±0.3pc, is estimated from star counts
    carried out inside and outside the cluster region. The comparison of
    the cluster colour-magnitude diagrams with isochrones of the Padova
    group yields E(B-V)=0.30±0.05, E(V-I)=0.40±0.05 and
    V-MV=12.20±0.25 for logt=8.70 (t=500+130-100Myr) and Z=0.019.
    NGC 2489 is then located at 1.8±0.3kpc from the Sun and 25pc below
    the Galactic plane. The analysis of the kinematical data allowed us to
    confirm cluster membership for six red giants, one of them being a
    spectroscopic binary. A mean radial velocity of 38.13±0.33km/s
    was derived for the cluster red giants. The properties of a sample of
    open clusters aligned along the line of sight of NGC 2489 are
    examined.

Description:
    CCD images of the cluster field were obtained with the Johnson B and V
    and KronCousins I filters using the 0.9-m telescope at Cerro Tololo
    Inter-American Observatory (CTIO, Chile) on 2000 December 2324.
Objects:
    -----------------------------------------
       RA (2000) DE   Designation(s)
    -----------------------------------------
    07 56.3   -30 04  NGC 2489 = C 0754-299
    -----------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        67     2182   CCD BVI data of stars in the field of NGC 2489


See also:
   J/A+A/373/153 : CCD Δa-photometry of 5 open clusters (Paunzen+, 2001)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Star      Star identification number,
                                   Cl* NGC 2489 PCM NNNN in Simbad
   6-  8  I3    ---     LJ98      ? Lindoff & Johansson (1968ArA.....5...45L)
                                    number, NGC 2489 NNN in Simbad (1)
  10- 17  F8.3  pix     Xpos      X position (2)
  19- 26  F8.3  pix     Ypos      Y position (2)
  28- 33  F6.3  mag     Vmag      Kron V magnitude
  35- 39  F5.3  mag     e_Vmag    rms uncertainty on Vmag
  41- 46  F6.3  mag     B-V       ?=99.999 B-V Johnson-Kron colour index
  48- 52  F5.3  mag     e_B-V     ?=9.999  rms uncertainty on B-V
  54- 59  F6.3  mag     V-Ic      ?=99.999 V-Ic Kron-Cousins colour index
  61- 65  F5.3  mag     e_V-Ic    ?=9.999  rms uncertainty on V-Ic
      67  I1    ---     N         Number of observations

Note (1): Only for those stars with CORAVEL radial-velocity data

Note (2): (x, y) coordinates correspond to the reference system of Fig. 1.
          1 pix =0.4". North is up and east is to the left-hand side.
          Coordinates of the center: ~(1200, 1220), (07:56:16, -30:04, J2000)


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    08-Oct-2007