2001A&A...372...71D


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.21CEST12:01:35

2001A&A...372...71D - Astronomy and Astrophysics, volume 372, 71-84 (2001/6-2)

Multicolour CCD photometry of old open clusters: King 5 and Be 20.

DURGAPAL A.K., PANDEY A.K. and MOHAN V.

Abstract (from CDS):

We present multicolour CCD photometry for two poorly studied open clusters (King 5 and Be 20). Photometry for a field near King 5 was also carried out to estimate the contamination by field stars. The colour magnitude diagrams (CMD) of the clusters show a well defined main sequence extending to the limit of the photometry, V≃20mag. The reddening for King 5, estimated from the colour-colour diagram, is ∼0.82, whereas that for Be 20 as estimated by comparing theoretical main-sequence (MS) with the observed MS is 0.10. The morphology of the CMDs indicates that these clusters are old. The CMD of Be 20 shows a globular cluster-like horizontal branch. In case of King 5 the comparison of observational CMDs with the standard isochrones of VandenBerg (1985ApJS...58..711V) indicates an apparent discrepancy between the shape of the turnoff and isochrones. The CMDs of King 5 seem to be better understood in terms of stellar models with convective overshoot. The comparison of the CMDs with the stellar models by Bertelli et al. (1985A&A...150...33B) with convective overshoot produces a good fit for a metallicity Z=0.008 and an age of 1Gyr for King 5 and 5Gyr for Be 20. An apparent distance modulus (m-M)=14.0 and 15.1 has been estimated for King 5 and Be 20 respectively. They correspond to a distance of 1900±100pc and 9026±480pc, respectively. The radial density distribution in King 5 indicates that there is an excess of low mass stars in the outer region of the cluster, whereas the density distribution in Be 20 shows a good fit with the empirical King (1962AJ.....67..471K) model. For both clusters, observations have also been carried out to search for variable stars.

Abstract Copyright:

Journal keyword(s): Hertzsprung-Russel (HR) diagram - open clusters - individual: King 5 - Be 20

VizieR on-line data: <Available at CDS (J/A+A/372/71): table2.dat table3.dat table4.dat>

Nomenclature: Table 2: Cl* King 5 DPM NNN (Nos 1-470). Table 3: Cl* King 5 DPME NNN (Nos 1-189). Table 4: Cl* Berkeley 20 DPM NNN (Nos 1-365).

Status in Simbad:  will not be processed

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 C 0311+525 OpC 03 14 46 +52 41.8           ~ 47 0
2 Cl King 22 OpC 05 22 24 +45 24.3           ~ 47 0
3 Cl Berkeley 20 OpC 05 32 37.0 +00 11 18           ~ 97 0
4 ESO 368-7 OpC 07 38 42 -33 50.1           ~ 43 0
5 NGC 2682 OpC 08 51 18 +11 48.0           ~ 1974 0
6 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 834 0
7 Cl* King 5 DPM 13 *iC ~ ~     14.852     ~ 1 0
8 Cl* King 5 DPM 192 *iC ~ ~     15.023     ~ 1 0
9 Cl* King 5 DPM 71 *iC ~ ~     15.167     ~ 1 0
10 Cl* King 5 DPM 185 *iC ~ ~     14.841     ~ 1 0
11 Cl* King 5 DPM 42 *iC ~ ~     16.074     ~ 1 0
12 Cl* Berkeley 20 DPM 247 *iC ~ ~     18.380     ~ 1 0
13 Cl* Berkeley 20 DPM 215 *iC ~ ~     18.845     ~ 1 0
14 Cl* Berkeley 20 DPM 51 *iC ~ ~     18.674     ~ 1 0
15 Cl* Berkeley 20 DPM 222 *iC ~ ~     18.001     ~ 1 0
16 Cl* Berkeley 20 DPM 210 *iC ~ ~     18.408     ~ 1 0
17 Cl* King 5 DPM 201 *iC ~ ~     13.823     ~ 1 0
18 Cl* Berkeley 20 DPM 41 *iC ~ ~     18.617     ~ 1 0
19 Cl* King 5 DPM 37 *iC ~ ~     15.833     ~ 1 0
20 Cl* King 5 DPM 27 *iC ~ ~     17.149     ~ 1 0
21 Cl* King 5 DPM 36 *iC ~ ~     13.859     ~ 1 0
22 Cl* King 5 DPM 68 *iC ~ ~     19.977     ~ 1 0
23 Cl* King 5 DPM 54 *iC ~ ~     15.584     ~ 1 0
24 Cl* Berkeley 20 DPM 32 *iC ~ ~     20.030     ~ 1 0
25 Cl* Berkeley 20 DPM 27 *iC ~ ~     17.723     ~ 1 0
26 Cl* Berkeley 20 DPM 33 *iC ~ ~     21.624     ~ 1 0
27 Cl* Berkeley 20 DPM 15 *iC ~ ~     18.897     ~ 1 0
28 Cl* Berkeley 20 DPM 161 *iC ~ ~     17.365     ~ 1 0
29 Cl* King 5 DPM 217 *iC ~ ~     13.923     ~ 1 0
30 Cl* Berkeley 20 DPM 257 *iC ~ ~     15.152     ~ 1 0
31 Cl* Berkeley 20 DPM 263 *iC ~ ~     15.726     ~ 1 0
32 Cl* King 5 DPM 394 *iC ~ ~     15.573     ~ 1 0
33 Cl* King 5 DPM 259 *iC ~ ~     14.319     ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.09.21-12:01:35

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