2005A&A...437..531O


Query : 2005A&A...437..531O

2005A&A...437..531O - Astronomy and Astrophysics, volume 437, 531-536 (2005/7-2)

Colour-Magnitude analysis of five old open clusters.

ORTOLANI S., BICA E. and BARBUY B.

Abstract (from CDS):

The Galileo Telescope was used to carry out BV photometry of five faint open clusters, for which no Colour Magnitude Diagrams were available in the literature. The clusters Berkeley 24, Berkeley 35, Berkeley 78, PWM 1, and PWM 4 are found to be old open clusters. Berkeley 24, Berkeley 35, and PWM 4 show a red clump. We fitted Padova isochrones to derive reddening and distance. The clusters Berkeley 35 and Berkeley 78 show low E(B-V)=0.0 and 0.01 compatible with their relatively high Galactic latitudes, whereas higher values of E(B-V)=0.4, 0.94 and 0.62 are found for Berkeley 24, PMW1, PMW4. Their distances to the Sun are in the range 4.4<d<7.9kpc implying that they are at distances of 11.5 to 13.5kpc from the Galactic center. The isochrone fitting show ages in the range 1.0<Age(Gyr)<6.3. Further discussion of the different methods used to derive age is given, in particular using the difference in magnitude between turn-off and giant clump, which gives lower ages. The contribution of the five old open clusters studied here, with basic parameters known, increases the overall sample to 108 objects. An important addition is the very old (6.3Gyr) open cluster PWM 4.

Abstract Copyright:

Journal keyword(s): Galaxy: disk - hertzsprung-Russell (HR) and C-M diagrams - open clusters and associations: general

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME PWM 1 Cl* 01 08 05 +65 38.8           ~ 8 0
2 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2775 0
3 Cl Berkeley 24 OpC 06 37 48 -00 52.0           ~ 13 0
4 Cl Berkeley 35 OpC 07 09 56 +02 44.0           ~ 12 0
5 Cl Berkeley 78 OpC 07 23 42 +05 22.0           ~ 10 0
6 NAME PWM 4 OpC 23 50 53 +62 19.4           ~ 17 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-23:59:45

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