J/PAZh/38/860 Thin disk BV-GV Hipparcos stars within 333pc (Gontcharov+, 2012)
Dependence of kinematics on the age of stars in the solar neighborhood.
Gontcharov G.A.
<Pis'ma Astron. Zh. 38, 860 (2012)>
=2012PAZh...38..860G 2012PAZh...38..860G (SIMBAD/NED BibCode)
=2012AstL...38..771G 2012AstL...38..771G
ADC_Keywords: Stellar distribution ; Stars, distances
Keywords: star counts - distribution of stars - Hertzsprung-Russell diagram -
main sequence - stellar kinematics - Galactic solar neighborhood
Abstract:
The variations of kinematic parameters with age are considered for a
sample of 15402 thin-disk O-F stars with accurate RA, DEC, proper
motion, and parallax higher than 3 mas from the Hipparcos catalogue
(2007A&A...474..653V 2007A&A...474..653V) and radial velocities from the PCRV
(2006PAZh...32..844G 2006PAZh...32..844G) catalogue. The ages have been calculated from
the positions of the stars on the Hertzsprung-Russell diagram relative
to the isochrones from the Padova database
(http://stev.oapd.inaf.it/cmd) by taking into account the extinction
from the previously constructed 3D analytical model
(2009AstL...35..780G 2009AstL...35..780G) and extinction coefficient RV from the 3D map of
its variations (2012AstL...38...12G 2012AstL...38...12G). Smooth, mutually reconciled
variations of the velocity dispersions sigma(U), sigma(V), sigma(W),
solar motion components Usun, Vsun, Wsun, Ogorodnikov-Milne model
parameters, Oort constants, and vertex deviation lxy consistent with
all of the extraneous results for which the stellar ages were
determined have been found and presented in the table solution.dat.
The velocity dispersion variations are well fitted by power laws the
deviations from which are explained by the influence of predominantly
radial stellar streams: Sirius, Hyades, alpha Cet/Wolf 630, and
Hercules. The accuracy of determining the solar motion relative to the
local standard of rest is shown to be fundamentally limited due to
these variations of stellar kinematics. The deviations of our results
from those of Dehnen and Binney (1998MNRAS.294..429D 1998MNRAS.294..429D), the
Geneva-Copenhagen survey of dwarfs (V/117), and the Besancon model of
the Galaxy (2003A&A...409..523R 2003A&A...409..523R) are explained by the use of PCRV
radial velocities with corrected systematic errors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
thin.dat 205 15402 Thin disk stars with homogeneous XYZUVW
solution.dat 150 14902 Age dependence of the kinematics of the stars
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/311 : Hipparcos, the new Reduction of the Raw data (van Leeuwen, 2007)
III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Nordstrom+ 2004)
J/PAZh/38/776 : Complete sample of OB stars within 350pc (Gontcharov, 2012)
Byte-by-byte Description of file: thin.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP [20,120082] HIP (Cat. I/239) number
8- 16 F9.5 deg GLON [0.02838,359.99687] Galactic longitude
18- 26 F9.5 deg GLAT [-88.50369,89.58349] Galactic latitude
28- 32 F5.1 pc Dist [4.6,333.3] Hipparcos distance
34- 40 F7.1 mas/a pmGLON [-2159.4,1163.2] Proper motion in
GLON*cos(GLAT) (1)
42- 48 F7.1 mas/a pmGLAT [-1478.7,667.7] Proper motion in GLAT (1)
50- 55 F6.1 km/s HRV [-125.0,146.5] Radial velocity (2)
57- 59 F3.1 km/s e_HRV [0.1,5.0] HRV error (2)
61- 65 F5.2 mag BTmag [2.41,13.00] Tycho-2 BT magnitude (3)
67- 70 F4.2 mag e_BTmag [0.01,0.25] Error on BTmag (3)
72- 76 F5.2 mag VTmag [2.24,12.15] Tycho-2 VT magnitude (3)
78- 81 F4.2 mag e_VTmag [0.01,0.25] Error on VTmag (3)
83- 87 F5.2 mag Jmag [1.67,11.58] 2MASS J magnitude (4)
89- 93 F5.2 mag e_Jmag [0.02,10.00]? Error on 2MASS J magnitude (4)
95- 99 F5.2 mag Ksmag [1.37,11.77] 2MASS Ks magnitude (4)
101-105 F5.2 mag e_Ksmag [0.01,10.00]? Error on 2MASS Ks magnitude (4)
107-110 F4.2 mag AVe [0.01,0.47] Extinction in the equatorial
layer (5)
112-115 F4.2 mag AVg [0.00,0.71] Extinction in the Gould belt (5)
117-120 F4.2 mag AV [0.01,0.89] Total interstellar extinction
AV (5)
122-125 F4.2 mag AVT [0.01,0.95] Total Interstellar extinction
AVT (6)
127-131 F5.2 mag VTMAG [-4.88,10.47] Absolute magnitude VT (7)
133-137 F5.2 mag (BT-VT)0 [-0.47,0.70] Dereddened (BT-VT) (8)
139-144 F6.1 pc X [-326.6,329.3] X rectangular galactic
coordinate (9)
146-151 F6.1 pc Y [-332.0,330.7] Y rectangular galactic
coordinate (9)
153-158 F6.1 pc Z [-322.4,328.2] Z rectangular galactic
coordinate (9)
160-165 F6.1 km/s VGLON [-157.8,148.5] Velocity on GLON (10)
167-172 F6.1 km/s VGLAT [-123.8,124.4] Velocity on GLAT (10)
174-179 F6.1 km/s U [-136.6,115.8] U velocity component (11)
181-186 F6.1 km/s V [-102.2,62.9] V velocity component (11)
188-193 F6.1 km/s W [-78.4,64.5] W velocity component (11)
195-199 F5.3 Gyr Age [0.068,6.357] Age in Gyr (12)
201-205 F5.2 --- [Fe/H] [-0.21,0.01] Metallicity (13)
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Note (1): Proper motions calculated from Hipparcos data
Note (2): The heliocentric radial velocity and its error are taken from
III/252, Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006).
Note (3): BT and VT magnitudes and their errors are taken from Tycho-2 catalogue
(Hoeg et al., 2000, Cat. I/259)
Note (4): J and Ks magnitudes and their errors are taken from 2MASS catalogue
(Skrutskie et al., 2006, Cat. VII/233)
Note (5): Interstellar extinction AV is the sum of the ones in the equatorial
layer and in the Gould belt calculated from Gontcharov, 2012AstL...38...87G 2012AstL...38...87G.
Note (6): Interstellar extinction AVT is calculated as 1.07AV based on PARSEC
database (Bressan et al., 2012; http://stev.oapd.inaf.it/cmd)
Note (7): Absolute magnitude VT calculated in this paper.
Note (8): Dereddened (BT-VT) calculated in this paper.
Note (9): Rectangular galactic coordinates X to the galactic centre, Y to
the direction of galactic rotation and Z to the northern galactic pole
calculated based on Hipparcos data.
Note (10): Velocity components along GLON and GLAT in km/s calculated in this
paper.
Note (11): Velocity components U, V, W along X, Y, Z
Note (12): Age calculated in this paper.
Note (13): Metallicity FeH calculated in this paper based on the data from GCS
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Byte-by-byte Description of file: solution.dat
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Bytes Format Units Label Explanations
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1- 7 F7.5 Gyr Age [0.18678,5.97058] Mean age in Gyr (1)
9- 12 F4.2 Gyr e_Age [0.08,0.93] Error of Age in Gyr (1)
14- 16 F3.1 km/s e_U [0.4,1.2] Error of Usun (2)
18- 20 F3.1 km/s e_V [0.3,0.8] Error of Vsun (2)
22- 24 F3.1 km/s e_W [0.2,0.7] Error of Wsun (2)
26- 29 F4.1 km/s Usun [6.7,12.4] U component of solar motion (3)
31- 34 F4.1 km/s Vsun [9.7,25.1] V component of solar motion (3)
36- 39 F4.1 km/s Wsun [6.2,9.1] W components of solar motion (3)
41- 44 F4.1 km/s s_U [12.7,39.0] Dispersion of U (4)
46- 49 F4.1 km/s s_V [10.6,24.3] Dispersion of V (4)
51- 54 F4.1 km/s s_W [5.9,21.3] Dispersion of W (4)
56- 60 F5.3 --- {sV/sU} [0.553,0.842] Relation of dispersions
s_V to s_U (5)
62- 66 F5.3 --- sW/sU [0.406,0.557] Relation of dispersions
s_W to s_U (5)
68- 72 F5.1 s-1 Mux [-38.9,8.4]? Partial derivative Mux (6)
74- 78 F5.1 s-1 Muy [7.8,46.7]? Partial derivative Muy (6)
80- 84 F5.1 s-1 Muz [-39.7,6.4]? Partial derivative Muz (6)
86- 90 F5.1 s-1 Mvx [-9.9,18.1]? Partial derivative Mvx (6)
92- 96 F5.1 s-1 Mvy [-10.2,14.5]? Partial derivative Mvy (6)
98-102 F5.1 s-1 Mvz [-26.4,8.2]? Partial derivative Mvz (6)
104-108 F5.1 s-1 Mwx [-4.5,14.7]? Partial derivative Mwx (6)
110-114 F5.1 s-1 Mwy [-11.8,8.4]? Partial derivative Mwy (6)
116-120 F5.1 s-1 Mwz [-13.3,5.7]? Partial derivative Mwz (6)
122-126 F5.1 s-1 OortA [5.9,26.6]? Oort constant A (7)
128-132 F5.1 s-1 OortB [-26.6,4.4]? Oort constant B (7)
134-138 F5.1 s-1 OortC [-18.7,7.1]? Oort constant C (7)
140-144 F5.1 s-1 OortK [-21.2,4.3]? Oort constant K (7)
146-150 F5.1 deg Lxy [-11.9,25.7]? Vertex deviation lxy
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Note (1): Age calculated in this paper.
Note (2): Errors of velocity components calculated in this paper.
Note (3): Components of solar motion calculated in this paper.
Note (4): Dispersions of velocity components calculated in this paper.
Note (5): Relations of dispersions s_V to s_U and s_W to s_U calculated in this
paper.
Note (6): Partial derivatives in the Ogorodnikov-Milne model calculated in this
paper.
Note (7): Oort constants calculated in this paper.
Note (8): Vertex deviation lxy calculated in this paper.
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Acknowledgements:
George Gontcharov, georgegontcharov(at)yahoo.com
(End) George Gontcharov [Pulkovo Obs.], Patricia Vannier [CDS] 11-Jan-2016