2001A&A...375..840D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.20CEST08:42:29

2001A&A...375..840D - Astronomy and Astrophysics, volume 375, 840-850 (2001/9-1)

Structure and mass function of five intermediate/old open clusters.

DURGAPAL A.K. and PANDEY A.K.

Abstract (from CDS):

The UBVRI data of five northern open star clusters are used to study the mass function (MF), structure and dynamical state of these clusters. The clusters under discussion have ages ranging from ∼0.6 to 5Gyr. A comparison of the density profiles indicates that the evolution of the core of these clusters is almost the same, whereas the corona of the clusters are probably affected by the external environment and dynamical evolution. For the entire cluster region, the slope of the MF of three clusters (Be 64, Be 69 and King 5) has a value that agrees within the error with the Salpeter value, whereas King 7 and Be 20 show a steeper (Γ=-2.02±0.24) and almost a flat MF respectively. We find that the slope of the MF of two clusters (King 5 and King 7) changes significantly from the inner region to the outer region, becoming steeper at larger radii. The dynamical relaxation time of the clusters under discussion is less than the age of the clusters, which indicates that all of these clusters are dynamically relaxed. Thus the observed mass segregation in three clusters can be attributed to the dynamical evolution of the clusters. The ratio of the clusters' present radius to the limiting radius (determined from the relation given by King 1962) can be representated by an exponent law.

Abstract Copyright:

Journal keyword(s): galaxy: open clusters and associations: general

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl King 2 OpC 00 51 00 +58 11.0   21.39 19.78     ~ 40 0
2 Cl Berkeley 64 OpC 02 21 02.8 +65 53 48           ~ 23 0
3 C 0311+525 OpC 03 14 46 +52 41.8           ~ 51 0
4 Cl King 7 OpC 03 59 07 +51 46.9           ~ 43 0
5 Cl Berkeley 69 OpC 05 24 24 +32 36.5           ~ 32 0
6 Cl Berkeley 20 OpC 05 32 37.0 +00 11 18           ~ 100 0
7 C 0634+094 OpC 06 36 29 +09 28.2     10.9     ~ 76 0
8 Cl Berkeley 81 OpC 19 01 37 -00 27.6           ~ 51 0
9 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 878 0
10 NGC 7044 OpC 21 13 10 +42 29.7     12.0     ~ 47 0
11 Cl Berkeley 99 OpC 23 21 23 +71 47.3           ~ 28 0

    Equat.    Gal    SGal    Ecl

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2020.10.20-08:42:29

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