J/PAZh/39/601 Galactic kinematics from YSOs sample (Bobylev+, 2013)
Galactic kinematics from a sample of young massive stars.
Bobylev V.V., Bajkova A.T.
<Pis'ma Astron. Zh. 39, 601 (2013)>
=2013PAZh...39..601B 2013PAZh...39..601B
=2013AstL...39..532B 2013AstL...39..532B
ADC_Keywords: YSOs ; Milky Way ; Proper motions; Radial velocities ;
MK spectral classification
Keywords: OB stars - massive stars - spectroscopic binary systems -
Galactic kinematics - spiral structure - Gould Belt -
runaway star DW Car
Abstract:
Based on published sources, we have created a kinematic database on
220 massive (>10M☉) young Galactic star systems located within
<3 kpcof the Sun. Out of them, approximately 100 objects are
spectroscopic binary and multiple star systems whose components are
massive OB stars; the remaining objects are massive Hipparcos B stars
with parallax errors of no more than 10 percent. Based on the entire
sample, we have constructed the Galactic rotation curve, determined
the circular rotation velocity of the solar neighborhood around the
Galactic center R0=8kpc, V0=259±16km/s, and obtained the
following spiral density wave parameters: the amplitudes of the radial
and azimuthal velocity perturbations fR=-10.8±1.2km/s, and
fθ=7.9±1.3km/s, respectively; the pitch angle for a
two-armed spiral pattern i=-6.0±0.4deg, with the wavelength of the
spiral density wave near the Sun being λ=2.6±0.2kpc; and the
radial phase of the Sun in the spiral density wave
χ☉=-120±4°. We show that such peculiarities of the
Gould Belt as the local expansion of the system, the velocity
ellipsoid vertex deviation, and the significant additional rotation
can be explained in terms of the density wave theory. All these
effects decrease noticeably once the influence of the spiral density
wave on the velocities of nearby stars has been taken into account.
The influence of Gould Belt stars on the Galactic parameter estimates
has also been revealed. Eliminating them from the kinematic equations
has led to the following new values of the spiral density wave
parameters: fθ=2.9±2.1km/s and χ☉=-104±6°.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 163 226 Basic data on stars
refs.dat 54 52 References
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name1 Alternative star name
15- 25 A11 --- Name2 HD/CD/BD number
27- 29 A3 --- --- [HIP]
31- 36 I6 --- HIP ? Hipparcos number (Cat. I/311)
39- 48 F10.6 deg RAdeg Right ascension (J2000)
50- 59 F10.6 deg DEdeg Declination (J2000)
61- 66 F6.1 pc Dist Heliocentric distance
68- 73 F6.2 mas/yr pmRA Proper motion in right ascension
75- 80 F6.2 mas/yr pmDE Proper motion in declination
82- 87 F6.1 km/s HRV Line-of-sight velocity
89- 93 F5.1 pc e_Dist Heliocentric distance error
95- 98 F4.2 mas/yr e_pmRA Error of proper motion in right ascension
100-103 F4.2 mas/yr e_pmDE Error of proper motion in declination
105-108 F4.1 km/s e_HRV Line-of-sight velocity error
110-113 F4.1 km/s sigma Line-of-sight velocity dispersion
115-124 A10 --- SpT1 Spectral type of first component
125-132 A8 --- SpT2 Spectral type of second component
133-137 A5 --- SpT3 Spectral type of third component
139-143 F5.1 km/s Vpec Peculiar space velocity
145-148 F4.1 km/s e_Vpec Error of peculiar space velocity
150-163 A14 --- Ref Reference information
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ref Reference from stars.dat
6- 24 A19 --- BibCode Bibcode
26- 46 A21 --- Aut Author's name
49- 54 A6 --- Com Comments
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Acknowledgements:
Vadim Bobylev, vbobylev(at)gao.spb.ru
(End) Patricia Vannier [CDS] 01-Oct-2013