J/PAZh/32/906 Kinematics of Gould Belt Based on Open Clusters (Bobylev, 2006)
Kinematics of Gould Belt Based on Open Clusters.
Bobylev V.V.
<Pis'ma Astron. Zh. 32, 906 (2006)>
=2006PAZh...32..906B 2006PAZh...32..906B
=2006AstL...32..816B 2006AstL...32..816B
ADC_Keywords: Clusters, open ; Associations, stellar ; Space velocities ;
Radial velocities
Abstract:
We have redetermined kinematic parameters of the Gould Belt using
currently available data on the motion of nearby young (logt<7.91)
open clusters, OB associations, and moving stellar groups. Our
modeling shows that the residual velocities reach their maximum values
of -4km/s for rotation (in the direction of Galactic rotation) and
+4km/s for expansion at a distance from the kinematic center of 300pc.
We have taken the following parameters of the Gould Belt center:
R0=150pc and l0=128°. The whole structure is shown to move
relative to the local standard of rest at a velocity of 10.7±0.7km/s
in the direction l=274±4° and b=-1±3°. Using the derived
rotation velocity, we have estimated the virial mass of the Gould Belt
to be 1.5 million solar masses.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 73 20 Space velocities of open clusters and OB associations
table2.dat 60 29 Space velocities of open clusters. All input data
were taken from COCD (J/A+A/438/1163, J/A+A/440/403)
--------------------------------------------------------------------------------
See also:
I/280 : All-sky Compiled Catalogue of 2.5 million stars (ASCC-2.5)
(Kharchenko, 2001)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD-1) (Kharchenko+, 2005)
J/A+A/440/403 : 109 new Galactic open clusters (COCD-2) (Kharchenko+, 2005)
J/AZh/83/821 : Compiled stellar radial velocities catalog (OSACA)
(Bobylev+, 2006)
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Cluster or OB-association designation
14- 16 I3 pc Dist Cluster distance
18- 19 I2 pc e_Dist ? Standar error in Dist (only in table1)
21- 26 F6.2 km/s UVel Velocity component U in Gal. coord. system (1)
28- 32 F5.2 km/s e_UVel Standard error in UVel
34- 39 F6.2 km/s VVel Velocity component V in Gal. coord. system (1)
41- 44 F4.2 km/s e_VVel Standard error in VVel
46- 51 F6.2 km/s WVel Velocity component W in Gal. coord. system (1)
53- 56 F4.2 km/s e_WVel Standard error in WVel
58- 59 I2 --- o_RV Number of stars used for calculation of RV
60 A1 --- n_RV [*] Note on velocity errors (2)
62- 67 F6.2 km/s RV ? Average radial velocity (only in table1)
69- 73 F5.2 km/s e_RV ? Standard error in RV (only in table1)
--------------------------------------------------------------------------------
Note (1): These velocities were corrected for the differential Galactic
rotation with Oort constants: A=13.7km/s/kpc and B=-12.9km/s/kpc.
Note (2): * marks the four clusters for which the random errors e_RV in
one of the velocity component U,V,W exceed 5km/s.
--------------------------------------------------------------------------------
(End) Veta Avedisova (INASAN) 01-Oct-2007