Stellar kinematics | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Stellar_kinematics


00:01:23 1 Space velocity
00:02:51 2 Use of kinematic measurements
00:03:28 3 Recent advancements due to iGaia/i
00:09:30 4 Stellar kinematic types
00:10:33 4.1 High-velocity stars
00:12:14 4.1.1 Runaway stars
00:13:02 4.1.2 Halo stars
00:15:33 4.1.3 Hypervelocity stars
00:16:31 4.1.3.1 Origin of hypervelocity stars
00:16:48 4.1.3.2 Partial list of HVSs
00:16:53 5 Kinematic groups
00:19:41 5.1 Stellar associations
00:22:52 5.1.1 Types
00:24:54 5.1.2 OB associations
00:26:20 5.1.3 T associations
00:27:16 5.1.4 R associations
00:28:03 5.2 Moving groups
00:29:41 5.3 Stellar streams
00:30:47 5.4 Known kinematic groups
00:31:42 6 See also
00:32:53 7 References
00:33:16 8 Further reading
00:33:29 9 External links



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SUMMARY
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In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space. The subject of stellar kinematics encompasses the measurement of stellar velocities in the Milky Way and its satellites as well as the measurement of the internal kinematics of more distant galaxies. Measurement of the kinematics of stars in different subcomponents of the Milky Way including the thin disk, the thick disk, the bulge, and the stellar halo provides important information about the formation and evolutionary history of our Galaxy. Kinematic measurements can also identify exotic phenomena such as hypervelocity stars escaping from the Milky Way, which are interpreted as the result of gravitational encounters of binary stars with the supermassive black hole at the Galactic Center.
Stellar kinematics is related to but distinct from the subject of stellar dynamics, which involves the theoretical study or modeling of the motions of stars under the influence of gravity. Stellar-dynamical models of systems such as galaxies or star clusters are often compared with or tested against stellar-kinematic data to study their evolutionary history and mass distributions, and to detect the presence of dark matter or supermassive black holes through their gravitational influence on stellar orbits.