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 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 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. 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 59 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-Jun-1997