NDLI: Galactic kinematics from a sample of young massive stars

Content Provider	Springer Nature Link
Author	Bobylev, V. V. Bajkova, A. T.
Copyright Year	2013
Abstract	Based on published sources, we have created a kinematic database on 220 massive (> 10 M $_{⊙}$) young Galactic star systems located within ≤3 kpc of the Sun. Out of them, ≈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%. 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 at R $_{0}$ = 8kpc, V $_{0}$ = 259±16 km s$^{−1}$, and obtained the following spiral density wave parameters: the amplitudes of the radial and azimuthal velocity perturbations f $_{ R }$ = −10.8 ± 1.2 km s$^{−1}$ and f $_{ θ }$ = 7.9 ± 1.3 km s$^{−1}$, respectively; the pitch angle for a two-armed spiral pattern i = −6.0° ± 0.4°, with the wavelength of the spiral density wave near the Sun being λ = 2.6 ± 0.2 kpc; and the radial phase of the Sun in 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: f $_{ θ }$ = 2.9 ± 2.1 km s$^{−1}$ and χ $_{⊙}$ = −104° ± 6°.
Starting Page	532
Ending Page	549
Page Count	18
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	39
Issue Number	8
e-ISSN	15626873
Language	English
Publisher	Springer US
Publisher Date	2013-08-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	OB stars massive stars spectroscopic binary systems Galactic kinematics spiral structure Gould Belt runaway star DW Car 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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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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