J/PAZh/33/643 Kinematics of Sco-Cen OB Association (Bobylev+, 2007)
Kinematics of the Scorpius-Centaurus OB association.
Bobylev V.V., Bajkova A.T.
<Pis'ma Astron. Zh. 33, 643 (2007)>
=2007PAZh...33..643B 2007PAZh...33..643B
=2007AstL...33..571B 2007AstL...33..571B
ADC_Keywords: Associations, stellar; Proper motions; Radial velocities;
Space velocities; Magnitudes
Abstract:
A fine structure related to the kinematic peculiarities of three
components of the Scorpius-Centaurus association (LCC = Lower
Centaurus-Crux, UCL = Upper Centaurus-Lupus, and US = Upper Scorpius)
has been revealed in the UV-velocity distribution of Gould Belt stars.
We have been able to identify the most likely members of these groups
by applying the method of analyzing the two-dimensional probability
density function of stellar UV velocities that we developed. A
kinematic analysis of the identified structural components has shown
that, in general, the center-of-mass motion of the LCC, UCL, and US
groups follows the motion characteristic of the Gould Belt, notably
its expansion. The entire Scorpius-Centaurus complex is shown to
possess a proper expansion with an angular velocity parameter of
46±8km/s/kpc for the kinematic center with l0=-40° and
R0=110pc found. Based on this velocity, we have estimated the
characteristic expansion time of the complex to be 21±4Myr. The
proper rotation velocity of the Scorpius-Centaurus complex is lower in
magnitude, is determined less reliably, and depends markedly on the
data quality.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 207 255 Gould Belt stars with parallax errors < 20%
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
III/213 : General Cat. of mean radial velocities (Barbier-Brossat+, 2000)
III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
J/AZh/83/821 : Compiled stellar radial velocities cat. (OSACA) (Bobylev+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [HIP]
5- 10 I6 --- HIP HIP number (1)
12- 21 A10 --- Name Name of cluster or association,
in some cases, common name of the star (2)
23- 28 F6.1 km/s RV Mean radial velocity
31- 34 F4.1 km/s e_RV Standard error in RV if available
36 I1 --- n_RV Number of catalogues for calculation of RV
38- 47 A10 --- r_RV ? Source of RV (3)
49- 52 F4.2 --- P(LCC) Membership probability of LCC (Lower Cen-Cru)
54- 57 F4.2 --- P(UCL) Membership probability of UCL (Upper Cen-Lup)
59- 62 F4.2 --- P(US) Membership probability of US (Upper Sco)
64- 67 F4.2 --- P(Gould) Membership probability of Gould's Belt
69- 80 F12.8 deg RAdeg Right ascension in decimal degrees (J2000)
82- 93 F12.8 deg DEdeg Declination in decimal degrees (J2000)
95-100 F6.2 mas plx Hipparcos parallax
102-105 F4.2 mas e_plx ? Error of parallax
107-114 F8.2 mas/yr pmRA Proper motion in RA, mu(alpha)*cos(delta)
116-123 F8.2 mas/yr pmDE Proper motion in DE
125-130 F6.2 mag Vmag Johnson V magnitude
132-137 F6.1 km/s UVel Space velocity component on galactic X axis
138-143 F6.1 km/s VVel Space velocity component on galactic Y axis
144-149 F6.1 km/s WVel Space velocity component on galactic Z axis
151-155 F5.1 km/s e_UVel ? Standard error of UVel if e_RV available (4)
156-160 F5.1 km/s e_VVel ? Standard error of VVel if e_RV available (4)
161-165 F5.1 km/s e_WVel ? Standard error of WVel if e_RV available (4)
167-171 F5.2 mas/yr e_pmRA Error of proper motion in pmRA
173-177 F5.2 mas/yr e_pmDE Error of proper motion in pmDE
179-185 F7.3 mag BTmag ?=99.999 Tycho BT magnitude
187-193 F7.3 mag VTmag ?=99.999 Tycho VT magnitude
195-200 F6.3 mag e_BTmag ?=9.999 Error of Tycho BT magnitude
202-207 F6.3 mag e_VTmag ?=9.999 Error of Tycho VT magnitude
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Note (1):
Catalogue number of the star in the Hipparcos Catalogue (ESA 1997,
The Hipparcos and Tycho Catalogues, ESA SP-1200, Cat. I/239)
Note (2):
gLCC and gUCL represent the list of E.J. de Geus, P.T. de Zeeuw and
J. Lub (1989A&A...216...44D 1989A&A...216...44D)
Note (3): Source of RV as follows:
PCRV = Gontcharov (2006AstL...32..759, Cat. III/252),
http://www.geocities.com/orionspiral/
Jilinski = Jilinski et al. (2006A&A...216..44)
P+Jil = this work
Makarov = Makarov (2003AJ...126..1996)
Wichmann = Wichmann et al. (2003A&A...399..983)
Song = Song et al. (2003ApJ...599..342)
Torres = Torres et al. (2006, Cat. J/A+A/460/695)
Barb-Figon = Barbier-Brossat and Figon, Cat. III/213
Montes = Montes et al.(2001, Cat. J/MNRAS/328/45)
Sartory = Sartory et al. (2003, Cat. J/A+A/404/913)
Mamajek = Mamajek (2005ApJ...634..1385)
OSACA = Bobylev et al. (2006, Cat. J/AZh/83/821),
http://www.geocities.com/orionspiral/
Note (4):
For TWA 1,4,9,11 was adopted e_PAR/PAR=0.2.
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(End) Veta Avedisova (INASAN) 21-Jan-2008