high-velocity stars

high-velocity stars

Very old (population II) stars in the galactic halo that are relatively near the Sun but do not share in the common circular motion around the galactic center of the Sun and other stars in the Sun's neighborhood (see local standard of rest). They are actually moving slower than the Sun in elliptical orbits that often carry them far out of the galactic plane. Their apparently high velocities (>65 km s–1) relative to the Sun result from this difference in relative motions. High velocity provides an easy means of identifying individual old stars near the Sun, i.e. stars with a low abundance of heavy elements.
References in periodicals archive ?
Dr Tommaso Marchetti, one of the astronomers from Leiden University in the Netherlands, said: "Rather than flying away from the Galactic centre, most of the high-velocity stars we spotted seem to be racing towards it.
Summary: TEHRAN (FNA)- A team of astronomers using the latest set of data from ESA's Gaia mission to look for high-velocity stars being kicked out of the Milky Way were surprised to find stars instead sprinting inwards -- perhaps from another galaxy.
I was amazed how well we could apply the methods we developed with simulated stars to the high-precision data for the innermost high-velocity stars close to the supermassive black hole."
By comparing Hubble Space Telescope images from 1998 and 2015, Kevin Luhman (Penn State University) and colleagues found that Source X is moving at more than 55 km/s (120,000 mph) across the sky, away from the same origin point as two other high-velocity stars: the Becklin-Neugebauer (BN) object and Source I.
They include discussion of heliosphere boundary measurements, interstellar grain alignments, molecular gas, stars, star formation, planetary physics, exoplanetary systems, high-velocity stars, metal-poor stars, galactic archaeology, semianalytic vs.
Also, there is an unusually large number of high-velocity stars around 30 Doradus.
Also, there are an unusually large number of high-velocity stars around 30 Doradus.

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