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J/PASJ/60/1267      Old open clusters photometric data       (Hasegawa+, 2008)

New photometric data of old open clusters. II. A dataset for 36 clusters. Hasegawa T., Sakamoto T., Malasan H.L. <Publ. Astron. Soc. Jap., 60, 1267-1284 (2008)> =2008PASJ...60.1267H (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI Keywords: Galaxy: evolution - Galaxy: open clusters and associations: general - Galaxy: open clusters and associations: HR diagram - Galaxy: structure Abstract: We present new photometric data on 36 old open clusters using the 65-cm telescope at Gunma Astronomical Observatory. This dataset is a continuation of photometric data of old open clusters (Hasegawa et al. 2004, Cat. J/PASJ/56/295) collected mainly in the antigalactic center region. By constructing a color-magnitude diagram, we inspected the main sequence and (if richly populated) red-clump stars to evaluate the cluster parameters, that is, the age, distance, and reddening, by applying an isochrone provided by the Padova group. Now, 49 old clusters have consistently measured parameters (36 clusters in this study and 13 from Hasegawa et al. 2004, Cat. J/PASJ/56/295). The clusters are exclusively older than the Hyades cluster, and the age is distributed in the range 0.6-5.0Gyr. Description: Optical observations were conducted using the 65-cm telescope (F/12.0, f=7800mm) at Gunma Astronomical Observatory. Data were collected between 2000 December 4 and 2006 December 22, mostly in 2004 and 2006. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 53 36 List of open clusters observed in this study table2.dat 48 36 Log of optical photometric observations using the 65-cm telescope table4.dat 61 36 Parameters of the open clusters, as determined in this study
See also: J/PASJ/56/295 : BVIc photometry of old open clusters (Hasegawa+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster name 18- 19 I2 h RAh Revised central right ascension (J2000.0) 21- 22 I2 min RAm Revised central right ascension (J2000.0) 24- 25 I2 s RAs Revised central right ascension (J2000.0) 27 A1 --- DE- Revised central declination sign (J2000.0) 28- 29 I2 deg DEd Revised central declination (J2000.0) 31- 32 I2 arcmin DEm Revised central declination (J2000.0) 34- 39 F6.2 deg GLON Revised central Galactic longitude 41- 46 F6.2 deg GLAT Revised central Galactic latitude 48- 53 A6 --- Morph Morphological parameters given in COCD; contrast (1,2), richness (m,p), and detachment (I-IIII) (1)
Note (1): For Berkeley 102, no morphological parameters are given; however, it is a medium-rich and moderately concentrated cluster. The contrast depends on the membership of the ambient bright stars.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster name 18- 20 A3 --- Cam Adopted camera system 22- 24 F3.1 arcsec FWHM Typical seeing size at I-band 26- 27 I2 min TexpB Total exposure time in B band 29- 30 I2 min TexpV Total exposure time in V band 32- 33 I2 min TexpI Total exposure time in I band 35- 38 F4.1 mag Bmaglim Limiting B magnitude 40- 43 F4.1 mag Vmaglim Limiting V magnitude 45- 48 F4.1 mag Imaglim Limiting I magnitude
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Name Cluster name 18- 20 F3.1 Gyr Age Age (Isochrone fitting) 22- 26 F5.3 --- Z Assumed metallicity Z (Isochrone fitting) 28- 31 F4.2 mag E(V-I) V-I colour excess (Isochrone fitting) 33- 37 F5.2 mag (m-M)0 Deredenned distance modulus (Isochrone fitting) 39- 43 F5.2 kpc rGC Galactocentric distance (Isochrone fitting) (1) 45- 49 F5.2 kpc z Distance from the galactic plane (Isochrone fitting) 51 A1 --- l_E(V-I)D [~] Limit flag on E(V-I)D 52- 56 F5.2 mag E(V-I)D V-I color excess quoted from the DIRBE/ISSA 58- 61 F4.2 mag dE(V-I)D Differential reddening, which is the peak-to-peak difference of the DIRBE/ISSA color excess in the 10' box area
Note (1): The galactocentric distance is calculated assuming r=8.5kpc.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Jun-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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