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Kinematics of the galaxy from OB stars with proper motions from the Gaia DR1 catalogue

Content Provider	Springer Nature Link
Author	Bobylev, V. V. Bajkova, A. T.
Copyright Year	2017
Abstract	We consider two samples of OB stars with different distance scales that we have studied previously. The first and second samples consist of massive spectroscopic binaries with photometric distances and distances determined from interstellar calcium lines, respectively. The OB stars are located at heliocentric distances up to 7 kpc. We have identified them with the Gaia DR1 catalogue. Using the proper motions taken from the Gaia DR1 catalogue is shown to reduce the random errors in the Galactic rotation parameters compared to the previously known results. By analyzing the proper motions and parallaxes of 208 OB stars from the Gaia DR1 catalogue with a relative parallax error of less than 200%, we have found the following kinematic parameters: (U, V)$_{⊙}$ = (8.67, 6.63)± (0.88, 0.98) km s$^{−1}$, Ω$_{0}$ = 27.35 ± 0.77 km s$^{−1}$ kpc$^{−1}$, Ω′$_{0}$ = −4.13 ± 0.13 km s$^{−1}$ kpc$^{−2}$, and Ω″$_{0}$ = 0.672 ± 0.070 km s$^{−1}$ kpc$^{−3}$, the Oort constants are A = −16.53 ± 0.52 km s$^{−1}$ kpc$^{−1}$ and B = 10.82 ± 0.93 km s$^{−1}$ kpc$^{−1}$, and the linear circular rotation velocity of the local standard of rest around the Galactic rotation axis is V $_{0}$ = 219 ± 8 km s$^{−1}$ for the adopted R $_{0}$ = 8.0 ± 0.2 kpc. Based on the same stars, we have derived the rotation parameters only from their line-of-sight velocities. By comparing the estimated values of Ω′$_{0}$, we have found the distance scale factor for the Gaia DR1 catalogue to be close to unity: 0.96. Based on 238 OB stars of the combined sample with photometric distances for the stars of the first sample and distances in the calcium distance scale for the stars of the second sample, line-of-sight velocities, and proper motions from the Gaia DR1 catalogue, we have found the following kinematic parameters: (U, V, W)$_{⊙}$ = (8.19, 9.28, 8.79)± (0.74, 0.92, 0.74) km s$^{−1}$, Ω$_{0}$ = 31.53 ± 0.54 km s$^{−1}$ kpc$^{−1}$, Ω′$_{0}$ = −4.44 ± 0.12 km s$^{−1}$ kpc$^{−2}$, and Ω″$_{0}$ = 0.706 ± 0.100 km s$^{−1}$ kpc$^{−3}$; here, A = −17.77 ± 0.46 km s$^{−1}$ kpc$^{−1}$, B = 13.76 ± 0.71 km s$^{−1}$ kpc$^{−1}$, and V $_{0}$ = 252 ± 8 km s$^{−1}$.
Starting Page	159
Ending Page	166
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	43
Issue Number	3
e-ISSN	15626873
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-03-11
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	OB stars distance scale proper motions Gaia DR1 Galactic kinematics Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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