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J/A+A/440/403       109 new Galactic open clusters           (Kharchenko+, 2005)

109 new Galactic open clusters. Kharchenko N.V., Piskunov A.E., Roeser S., Schilbach E., Scholz R.-D. <Astron. Astrophys., 440, 403-408 (2005)> =2005A&A...440..403K
ADC_Keywords: Clusters, open ; Radial velocities ; Proper motions Keywords: techniques: photometric - catalogs - astrometry - stars: kinematics - open clusters and associations: general - Galaxy: stellar content Abstract: We present a list of 130 Galactic Open Clusters, found in the All-Sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5). For these clusters we determined a homogeneous set of astrophysical parameters such as size, membership, motion, distance and age. In a previous work (Cat. J/A+A/438/1163), 520 already-known open clusters out of a sample of 1700 clusters from the literature were confirmed in the ASCC-2.5 using independent, objective methods. Using these methods the whole sky was systematically screened for new clusters. The newly detected clusters show the same distribution over the sky as the known ones. It is found that without the a priori knowledge about existing clusters our search lead to clusters which are, on average, brighter, have more members and cover larger angular radii than the 520 previously-known ones. Description: The 1st Extension of the COCD (Catalogue of Open Cluster Data, Cat. J/A+A/438/1163)), COCD-1 (file clusters.dat) is a result of studies of wide neighborhoods of 130 newly discovered open clusters in the homogeneous All-sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5, Cat. I/280), application of a technique of cluster member selection and cluster parameter determination used for the study of known clusters by Kharchenko et al. (2004, Cat. J/AN/325/740 and 2005, Cat. J/A+A/438/1163). On the basis of data on about 6,200 possible members (including about 2,200 most probable ones) and homogeneous methods of cluster parameter determination the angular sizes of cluster cores and coronae, cluster heliocentric distances, colour-excesses, mean proper motions, and ages of 130 clusters and mean radial velocities of 69 clusters were established and collected in the COCD-1. Clusters in the catalogue are sorted by in right ascension J2000 order. The 1st Extension of the CSOCA (Catalogue of Stars in the Galactic Open Cluster Areas) CSOCA-1 (file stars.dat) is the result of systematic search of new open clusters (Kharchenko et al., this paper) in the homogeneous All-sky Compiled Catalogue of 2.5 Million Stars (ASCC-2.5, Cat. I/280), and of application of a technique of cluster member selection used for the construction of the CSOCA by Kharchenko et al. (2004, Cat. J/other/AN/325.740). The CSOCA-1 is comprised of 130 sky areas with newly discovered clusters. Twenty one of them contain objects identified with clusters listed for the first time in the on-line release 2.0 of catalogue by Dias et al. (2002, Cat. VII/229). Since no preliminary information on cluster properties is available (used in our search routine) on these objects in Dias et al. (2004, available at ) we regard them as independently detected clusters. The areas represent quadratic fields centered at adopted cluster centers with side lengths of acl[deg]=2*(rcl+0.1), where rcl is the determined angular radius of the cluster. For clusters with rcl<0.4°, acl=1°. In every cluster area the CSOCA-1 contains the complete list of the ASCC-2.5 stars. The catalog includes accurate J2000 equatorial coordinates, proper motions in the Hipparcos system, BV photometric data in the Johnson system, proper motion, photometric and spatial membership probabilities, and angular distances from the cluster centers for all included stars. If available, trigonometric parallaxes, multiplicity and variability flags from the ASCC-2.5, spectral types (from the ASCC-2.5 or the Tycho-2 Spectral Type Catalog III/231), and radial velocities with their errors from the Catalogue of Radial Velocities of Galactic Stars with high precision Astrometric Data (CRVAD, III/239) are also given. Since some cluster areas overlap each other some stars are included in the CSOCA several times. The catalogue contains 26,778 entries for 26,386 stars. Entries are sorted in right ascension J2000 order. The 1st Extension of the Open Cluster Diagrams Atlas (OCDA-1) (atlas/*) presents a set of open cluster diagrams used for the determination of parameters of 130 newly discovered open clusters, and is intended to illustrate the quality of the constructed cluster membership, and the accuracy of the derived cluster parameters (Kharchenko et al., this paper). Every diagram presents relation between various stellar data from all sky catalogue ASCC-2.5 (Kharchenko, 2001, Cat. I/280) in area of the specific cluster. There are five diagrams provided for every cluster in the Atlas: the area map, the density profile, the vector point diagram, the magnitude equation diagram, and the color-magnitude diagram. The OCDA-1 consists of 130 PostScript plots stored as gzipped files (i.e. one file per cluster). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file index.dat 71 130 Cluster list clusters.dat 170 130 COCD-1 catalog (Catalog of Open Cluster Data) notes.dat 80 61 Individual notes stars.dat 227 26778 Star catalog atlas/* 0 130 PostScript figures of each cluster
See also: I/280 : All-sky Compiled Catalogue of 2.5 million stars (Kharchenko 2001) III/239 : Radial Velocities with Astrometric Data, CRVAD (Kharchenko+ 2004) III/231 : The Tycho-2 Spectral Type Catalog (Wright+ 2003) VII/229 : Optically visible open clusters catalog, V1.0 (Dias+, 2002) : Version 2.0 J/AN/325/740 : Astrophysical supplements to ASCC-2.5 (Kharchenko+, 2004) J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005) J/AZh/80/291 : Proper motions of open clusters (Kharchenko+, 2003) Description of file: atlas/* The file name includes the sequential number of the corresponding cluster "Cluster" and the cluster designation "Name" from file cluster_index. For example, the file with the plot of the 1st cluster ASCC 1001 is named Each plot contains a header, five diagrams and selected cluster parameters from the 1st Extension of the Catalogue of Open Cluster Data (COCD-1). The header gives the equatorial coordinates of the newly determined cluster center, the cluster number and designation in the file index.dat and reference to note file. The panels present spatial, kinematic and evolutionary information. The upper row: the left panel is a sky map of the cluster neighborhood (MAP) constructed with stars from the catalogue I/280, and the right panel is the colour-magnitude diagram (CMD). The bottom row: the left panel shows density profile diagram (DPD) - radial profiles of the projected density, the middle panel is the vector point diagram of proper motions (VPD), and the two right panels are "magnitude equation" diagrams (MED) - proper motions versus magnitude. Common designation on MAP, CMD, VPD, MED: Green symbols: stars within the cluster radius; Black symbols: the most probable (1sigma members) within of cluster core; Red symbols: the most probable (1sigma members) outside of the core and within cluster corona. MAP: Stars are displayed as circles. The circle size corresponds to stellar magnitude ranged in six Vmag intervals: <4.0, 4.0-6.0, 6.0-8.0, 8.0-10.0, 10.0-12.0, >12.0. Cyan open circles: stars outside of cluster area (are shown in MAP only); Green open circles: stars inside of cluster area; Blue cross: cluster center selected in this study; Magenta pulses: centers of other clusters (from Dias et al., 2004) visible (if any) in this map; Solid blue circle: cluster core border (rcore); Dashed blue circle: cluster border (rcl). CMD: Solid blue lines outline a domain of 100% photometric cluster members. - the left border is the empirical ZAMS of Schmidt-Kaler; - the right border is composed as it is described by Kharchenko et al. (2004, Cat. J/other/AN/325.740); For convenience blue edge is extended in comparison to the Schmidt-Kaler ZAMS up to MV= -7.0, (B-V)0= -0.33; - Solid cyan lines indicate blue and red borders of the evolved Main Sequence, (see Kharchenko et al., 2005A&A...440..403K for definitions); - Bars indicates the rms errors of V and (B-V) for 1sigma members; Magenta solid curves are Post- and Pre-MS isochrones closest to the determined cluster age; - Large magenta open circles mark stars selected for age determination (see Kharchenko et al. 2005A&A...440..403K for details). VPD: Bars indicate the rms errors of PM for 1sigma members. MED: - Magenta solid lines correspond to determined average proper motion of the cluster; - Bars indicate the rms errors of PM for 1sigma members. DPD: - Green solid line is constructed for all stars in the cluster area; - Magenta solid line is constructed for all members with membership probability P>1% (i.e. 1,2,3sigma members); - Black solid line is constructed for 1sigma members only; - Solid blue line indicates cluster core radius; - Dashed blue line indicates cluster radius; Notes on selected cluster parameters shown in the CMD panel: - The rms errors of determined PM and RV are shown in parentheses; - Distance modulus corresponds to indicated d and E(B-V) values; - Number of stars selected for logt determination is shown after symbol #; Byte-by-byte Description of file: index.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Cluster [1001-1130] Cluster sequential number 6- 9 A4 --- --- [ASCC] 11- 13 I3 --- ASCC Cluster ASCC number 17- 33 A17 --- Name Other cluster designation 41- 46 F6.3 h RAhour Right Ascension J2000.0 48- 53 F6.2 deg DEdeg Declination J2000.0 56- 71 A16 --- psFile Name of the postscript file, in subdirectory atlas
Byte-by-byte Description of file: clusters.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Cluster [1001-1130] Cluster sequential number 6- 9 A4 --- --- [ASCC] 11- 13 I3 --- ASCC Cluster ASCC number 15- 31 A17 --- Name Other cluster designation 35- 40 F6.3 h RAhour Right Ascension J2000.0 42- 47 F6.2 deg DEdeg Declination J2000.0 49- 54 F6.2 deg GLON Galactic longitude 56- 61 F6.2 deg GLAT Galactic latitude 64- 67 F4.2 deg Radco Angular radius of the core 70- 73 F4.2 deg Radcl Angular radius of the cluster 75- 81 F7.2 km/s RV ?=999.99 Average radial velocity 84- 88 F5.2 km/s e_RV ?=0.00 Standard error in RV 91- 92 I2 --- o_RV ?=0 Number of stars used for RV calculation 95-100 F6.2 mas/yr pmRA Average proper motion in RA*cos(DE) 103-106 F4.2 mas/yr e_pmRA Standard error in pmRA 109-114 F6.2 mas/yr pmDE Average proper motion in DE 117-120 F4.2 mas/yr e_pmDE Standard error in pmDE 123-128 F6.2 mas/yr pmGLON Average proper motion in l*cos(b) 131-136 F6.2 mas/yr pmGLAT Average proper motion in b 138-140 I3 --- N1s Number of the most probable (1 sigma) members 142-146 I5 pc Dist Distance 149-152 F4.2 mag E(B-V) Colour-excess 154-158 F5.2 mag m-M Apparent distance modulus 160-164 F5.2 [yr] logt Logarithm of average age 167-168 I2 --- o_logt Number of stars used for logt calculation 170 A1 --- Rem [*] indicates a note detailed in notes.dat
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Cluster Cluster sequential number 6- 80 A75 --- Note Text of the note
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
2- 13 F12.9 h RAhour Right Ascension J2000.0, epoch 1991.25 15- 26 F12.8 deg DEdeg Declination J2000.0, epoch 1991.25 28- 32 F5.1 mas e_RAhour Standard error in RA*cos(DEdeg) 34- 38 F5.1 mas e_DEdeg Standard error in DEdeg 40- 47 F8.2 mas Plx ?=9999.99 Trigonometric parallax 49- 56 F8.2 mas e_Plx ?=999.99 Standard error in Plx 58- 65 F8.2 mas/yr pmRA Proper Motion in RA*cos(DEdeg) 67- 74 F8.2 mas/yr pmDE Proper Motion in DE 76- 81 F6.2 mas/yr e_pmRA Standard error in pmRA 83- 88 F6.2 mas/yr e_pmDE Standard error in pmDE 90- 95 F6.3 mag Bmag ?=99.999 B magnitude in Johnson system 97-102 F6.3 mag Vmag ?=99.999 V magnitude in Johnson system 105-109 F5.3 mag e_Bmag ?=9.999 Standard error on B magnitude 112-116 F5.3 mag e_Vmag ?=9.999 Standard error on V magnitude 119-123 F5.3 mag Scat ?=9.999 Scatter on magnitude 125 A1 --- v1 *[GN ] Known variability from GCVS/NSV 126 A1 --- v2 *[UVW ] Variability from Tycho-1 127 A1 --- v3 *[CDMPRU ] Variability type 128 A1 --- v4 *[VYIXR ] Variability from CMC11 129-130 A2 --- d12 *[A-S ] CCDM component identifier (Cat. I/274) 131 A1 --- d3 *[A-S ] Component identifier 132 A1 --- d4 *[DRSYZ ] Duplicity from Tycho-1 133 A1 --- d5 *[CGOVX ] Double/Multiple Systems flag 134 A1 --- d6 [D ] Duplicity flag from PPM 136-155 A20 --- SpType MK Spectral type (from Cats I/280A or III/231) 157-162 I6 --- HIP ?=0 Hipparcos (Cat. I/239) number 164-169 I6 --- HD ?=0 HD (Cat. III/135) number 171-177 I7 --- ASCC ASCC-2.5 (Cat. I/280) number 179-183 I5 --- CRVAD ?=0 CRVAD (Cat. III/239) number 186-192 F7.2 km/s RV ?=999.99 Average Radial Velocity 195-199 F5.2 km/s e_RV ?=0.00 Mean standard error in RV 201-204 I4 --- Cluster *[1001-1130] Cluster sequential number 206-211 F6.4 deg Rad Distance from the cluster center 213-218 F6.4 --- Pkin *[0,1] Membership probability from proper motion 220-225 F6.4 --- Pph *[0,1] Membership probability from Photometry 227 I1 --- Psp *[0,1] Membership probability from position
Note on v1: Byte 292 from Tycho-1 file tyc_main.dat This flag is set when the variability is known: G = variable known in General Catalog of Variable Stars N = variable known in New Suspected Variables catalog Note on v2: Byte 294 from Tycho-1 file tyc_main.dat This flag has the following meaning: U = apparent variability in the Tycho data; may be due to duplicity V = strong evidence of intrinsic variability W = suspected intrinsic variability Note on v3: Byte 322 from Hipparcos file hip_main.dat Hipparcos-defined type of variability (a blank entry signifies that the entry could not be classified as variable or constant): C = no variability detected ("constant") D = duplicity-induced variability M = possibly micro-variable (amplitude < 0.03mag) P = periodic variable R = V-I colour index was revised due to variability analysis U = unsolved variable which does not fall in the other categories Note on v4: Flag from CMC11 catalogue V = variable star Y or I = if the CAMC did not measure the mag, an approximate value from other sources is given to a precision of 0.1 mag X or R = star fainter than 12 with unknown mag is given as 12. Note on d12: Bytes 149, 150 from Tycho-2 file catalog.dat. The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. Note on d3: Byte 41 from Hipparcos file hipdmcom.dat Note on d4: Byte 296 from Tycho-1 file tyc_main.dat Unresolved duplicity status from Tycho data analysis: D = duplicity clearly indicated (B_Tmag and V_Tmag refer to combined light) R = duplicity weakly indicated, combined with indication of variability S = duplicity suspected Y = investigation for duplicity carried out on Tycho data, no indication of duplicity was found Z = investigation for duplicity not carried out blank = Hipparcos star not observed by Tycho Note on d5: Byte 347 from Hipparcos file hip_main.dat Indicates that further details are given in the Hipparcos Double and Multiple Systems Annex: C = solutions for the components G = acceleration or higher order terms O = orbital solutions V = variability-induced movers (apparent motion arises from variability) X = stochastic solution (probably astrometric binaries with short period) Note on Cluster: Sequential number of a cluster in the file cluster_index Note on Pkin: Pkin, % = Pkin*100 Note on Pph: Pph, % = Pph*100 Note on Psp: Psp=1 if rad ≤ cluster radius Psp=0 if rad > cluster radius
Acknowledgements: Ralf-Dieter Scholz, rdscholz(at) History: * 13-Sep-2005: Original version * 20-Oct-2005: Atlas files (atlas/*) replaced by a version slightly modified from the author (density profiles scales)
(End) Patricia Vannier [CDS] 13-Sep-2005
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