J/MNRAS/437/804 UBVRI photometry of NGC559 stars (Joshi+, 2014)
Photometric study of the open cluster.
II. Stellar population and dynamical evolution in NGC 559.
Joshi Y.C., Balona L.A., Joshi S., Kumar B.
<Mon. Not. R. Astron. Soc., 437, 804-815 (2014)>
=2014MNRAS.437..804J 2014MNRAS.437..804J
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared ;
Proper motions
Keywords: techniques: photometric - stars: formation -
stars: luminosity function, mass function
Abstract:
We present UBVRI photometry of stars in the field of the
intermediate-age open cluster NGC 559. By determining the stellar
membership probabilities derived through a photometric and kinematic
study of the cluster, we identify the 22 most probable cluster
members. These are used to obtain robust cluster parameters. The mean
proper motion of the cluster is µx=-3.29±0.35,
µy=-1.24±0.28mas/yr. The radial distribution of the stellar
surface density gives a cluster radius of 4.5±0.2arcmin
(3.2±0.2pc). By fitting solar metallicity stellar isochrones to the
colour-colour and colour-magnitude diagrams, we find a uniform cluster
reddening of E(B-V)=0.82±0.02. The cluster has an age of 224±25Myr
and is at a distance of 2.43±0.23kpc. From the optical and
near-infrared two-colour diagrams, we obtain colour excesses in the
direction of the cluster E(V-K)=2.14±0.02, E(J-K)=0.37±0.01 and
E(B-V)=0.76±0.04. A total-to-selective extinction of RV=3.5±0.1
is found in the direction of the cluster which is marginally higher
than the normal value. We derive the luminosity function and the mass
function for the cluster main sequence. The mass function slope is
found to be -2.12±0.31. We find evidence of mass segregation in this
dynamically relaxed cluster.
Description:
Johnson-Cousins UBVRI photometry of stars in the field of NGC 559 was
obtained on 2010 November 30 using the 1m Sampurnanand telescope at
Nainital, India. The telescope is equipped with a 2kx2k CCD camera
which covers a 13arcminx13arcmin field of view. We acquired two frames
each in U, B, V, R and I filters with exposure times of 300, 300, 200,
100 and 60s in respective passbands, respectively, at a typical
airmass of about 1.3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 158 2393 Photometric catalogue of 2293 stars detected in
the field of cluster NGC 559
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See also:
J/MNRAS/419/2379 : NGC 6866 variables V and I light curves (Joshi+, 2012)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/2393] Sequential number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 35 F6.3 mag Umag ?=- Johnson U magnitude
37- 41 F5.3 mag e_Umag ? rms uncertainty on Umag (1)
43- 48 F6.3 mag Bmag ?=- Johnson B magnitude
50- 54 F5.3 mag e_Bmag ? rms uncertainty on Bmag (1)
56- 61 F6.3 mag Vmag ?=- Johnson V magnitude
63- 67 F5.3 mag e_Vmag ? rms uncertainty on Vmag (1)
69- 74 F6.3 mag Rmag ?=- Cousins R magnitude
76- 80 F5.3 mag e_Rmag ? rms uncertainty on Rmag (1)
82- 87 F6.3 mag Imag ?=- Cousins I magnitude
89- 93 F5.3 mag e_Imag ? rms uncertainty on Imag (1)
95-100 F6.3 mag Jmag ?=- 2MASS J magnitude
102-106 F5.3 mag e_Jmag ? rms uncertainty on Jmag (1)
108-113 F6.3 mag Hmag ?=- 2MASS H magnitude
115-119 F5.3 mag e_Hmag ? rms uncertainty on Hmag (1)
121-126 F6.3 mag Kmag ?=- 2MASS Ks magnitude
128-132 F5.3 mag e_Kmag ? rms uncertainty on Kmag
134-140 F7.2 mas/yr pmRA ?=- Proper motion along RA
142-145 F4.2 mas/yr e_pmRA ? rms uncertainty on pmRA
147-153 F7.2 mas/yr pmDE ?=- Proper motion along DE
155-158 F4.2 mas/yr e_pmDE ? rms uncertainty on pmDE
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Note (1): The error in magnitudes indicates the internal photometric error
in the measurement.
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History:
From electronic version of the journal
References:
Joshi et al., Paper I 2012MNRAS.419.2379J 2012MNRAS.419.2379J, Cat. J/MNRAS/419/2379
(End) Patricia Vannier [CDS] 08-Nov-2014