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J/AZh/72/495   Moving Star Clusters in the Solar Neighborhood  (Orlov+, 1995)

Moving Star Clusters in the Solar Neighborhood Orlov V.V., Panchenko I.E., Rastorguev A.S., Yatsevich A.V. <Astron. Zh. 72, 495 (1995)> =1995AZh....72..495O
ADC_Keywords: Associations, stellar ; Space velocities Description: Two cluster analysis algorithms - the principal stars method and the hierarchical clustering method - are used to identify moving star clusters in a sample of 1947 single and multiple stars in the nearby solar neighborhood with known space velocities from the Gliese and Jahreiss (Cat. V/70) catalog. Five rich moving clusters containing from 35 to 40 stars with velocities differing by not more than 6 km/s from the centroid value have been reliably identified. In addition, seven poor clusters have been identified with less confidence. Rich moving clusters include about 10% of all stars with known space velocities. Table 1: Summary on data for 12 moving clusters identified using the principal stars algorithm ------------------------------------------------------------------------ N <U> <V> <W> K km/s km/s km/s ------------------------------------------------------------------------ 1 +13.5 +2.8 -8.5 35 2 -14.2 -21.7 -10.2 35 3 -18.3 -9.0 -2.7 33 4 -31.0 -12.1 -11.5 32 5 -30.1 -11.5 +1.4 28 6 +14.8 -14.1 -15.4 16 7 -36.4 -27.5 -9.8 14 8 +17.6 -30.9 -0.3 10 9 -8.2 -33.4 -0.5 9 10 -38.1 -18.9 +7.5 9 11 +11.5 -21.9 -22.3 8 12 -1.9 -30.3 -6.5 8 Table 2: List of rich moving clusters identified by the hierarchical clustering method -------------------------------------------------------------- No. <U> <V> <W> K c km/s km/s km/s km/s -------------------------------------------------------------- 1 -40.5 -17.5 -3.4 31 6 2 +13.5 +3.4 -7.4 29 6 3 -12.5 -19.0 -9.0 25 6 4 -21.5 -9.3 -4.2 21 6 5 -14.7 -8.6 -0.1 20 6 6 -34.7 -15.7 -10.3 18 6 7 -28.7 -13.1 -8.1 18 6 8 -16.7 -23.7 -10.7 18 6 9 +6.2 -2.3 0.0 34 8 10 -29.9 -11.8 +2.1 31 8 Table 3: Nearby open cluster data ---------------------------------------------------------- N Name OCL U V W R Age km/s km/s km/s pc 10+7yrs ---------------------------------------------------------- 1 Pleiades 421 -6.2 -23.7 -13.4 125 5 2 Hyades 456 -43.1 -17.2 -4.2 43 80 3 Praesepe 501 -37.8 -21.0 -7.6 160 70 4 IC 2391 767 -18.1 -13.4 -6.1 150 3 5 IC 2602 838 -1.8 -26.4 -0.1 150 1 6 Coma 558 -1.6 -7.4 -0.8 80 40 7 a Per 392 -12.6 -22.0 -2.4 180 4 8 UMa 252 +14.2 -0.4 -11.8 20 50 9 Cr 399 113 -9.9 -30.7 -3.0 120 30 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 63 31 List of stars in the Hyades moving cluster table5.dat 63 42 List of stars in moving cluster no. 1 table6.dat 63 37 List of stars in moving cluster no. 2 table7.dat 63 39 List of stars in moving cluster no. 3 table8.dat 63 43 List of stars in moving cluster no. 4 table9.dat 63 32 List of stars in moving cluster no. 5
Byte-by-byte Description of file: table?.dat
Bytes Format Units Label Explanations
1- 2 I2 --- N Running number 5- 15 A11 --- Ident Star name from Gliese & Jahreiss (Cat. V/70) catalog 17- 18 I2 h RAh Right ascension (1950) 20- 21 I2 min RAm Right ascension (1950) 23- 24 I2 s RAs Right ascension (1950) 27 A1 --- DE- Declination sign 28- 29 I2 deg DEd Declination (1950) 31- 34 F4.1 arcmin DEm Declination (1950) 36- 39 I4 0.1mas plx Resulting parallax 42- 44 I3 0.1mas e_plx Error of parallax 47- 49 I3 km/s U ? Space velocity component, U 52- 54 I3 km/s V ? Space velocity component, V 57- 59 I3 km/s W ? Space velocity component, W 62- 63 I2 --- k ? Number of satellites in velocity space (U, V, W) for each star (Not in table4)

(End) Veta Avedisova [INASAN] 10-June-1997
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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