galactic halo

(redirected from Halo star)
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galactic halo

See Galaxy. See also dark halo.

galactic halo

[gə′lak·tik ′hā·lō]
(astronomy)
The spherical distribution of oldest stars that are centered about the galactic center of the Milky Way Galaxy.
References in periodicals archive ?
Deason and her team plucked the outer halo stars out of seven years' worth of archival Hubble telescope observations of our neighboring Andromeda galaxy.
The halo stars appear to move faster than the Andromeda stars because they are so much closer.
Team member Sangmo Tony Sohn of STScI identified the halo stars and measured both the amount and direction of their slight sideways motion.
When the team compared the tangential motion of the outer halo stars with their radial motion, they were very surprised to find that the two were equal.
The team compared their results with data of halo stars recorded in the Sloan Digital Sky Survey.
In a new study analyzing highly accurate measurements of the position and velocity of 41 halo stars near the sun, B.
In examining the Hipparcos measurements, Chen finds three large-scale clumps that could represent distinct streams of halo stars.
The smooth, well-mixed population of halo stars in these large galaxies represents the aggregate of the dwarf galaxy victims of this cannibalism process, while the dwarf galaxies that are still intact as they orbit their large parent galaxy are the survivors of this process.
For the latter scenario to hold true, the halo stars would barely shine and could have a mass no larger than one-tenth that of the sun.
If the halo stars are dark-matter tracers, they would have a more normal mix of masses.
The concentration of heavy elements in the third population falls between the high concentration in thin-disk stars and the low concentration in halo stars.