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 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 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