Sentences with phrase «halo stars»
The phrase "halo stars" refers to stars that are found in the outer regions of a galaxy, away from the main central disk. They have a faint glow around them that forms a halo-like shape. Full definition
The odd motion marks them as members of the Milky Way's ancient population of halo stars.
newscientist.com
Extremely scarce in elements heavier than hydrogen and helium («metals»), HE 0107 - 5240 was found as part of a search for metal - poor halo stars in the Hamburg / ESO Survey, which gave it its «HE» designation in combination with its position (see: press releases from ESO and the University of Michigan; and Christlieb et al, 2002).
Like other halo stars, it has little iron, because it arose before most of the stellar explosions that spewed the element into space.
Astronomer Jason Kalirai of the Space Telescope Science Institute in Baltimore, Maryland, has created a new method to measure the ages of individual halo stars.
However, for every star in a globular star - cluster, there exist roughly 100 halo stars on their own; dating them has been an enormous challenge.
Halo stars die by becoming red giants and then white dwarfs — dense stars little larger than Earth.
Composed of stars belonging to the extreme Population II (see below Stars and stellar populations), as well as the high - latitude halo stars, these nearly spherical assemblages apparently formed before the material of the Galaxy flattened into the present thin disk.
Location of our targets overlaid on a RGB rendering of the distribution of Milky Way halo stars.
While halo stars may only total as few as 0.1 percent of the stars in the solar neighborhood, they include Kapteyn's Star.
Most of the stars in the central bulge and in the globular clusters of the galactic halo are old, low metals stars, and halo stars account for only 0.1 to 0.2 percent of the stars near Sol.
«The current hierarchical Milky Way formation scenario suggests that streams of halo stars were originated as tidal debris from satellite dwarf galaxies being engulfed by the early Milky Way.
The team obtained spectra of the halo stars using Keck Observatory's High - Resolution Echelle Spectrometer (HIRES).
This provides compelling evidence that the halo stars most likely originate from the Galactic thin disk (the younger part of Milky Way, strongly concentrated towards the Galactic plane) itself.
For the first time, Bergemann's team presented detailed chemical abundance patterns of these halo stars using the W. M. Keck Observatory on Maunakea, Hawaii.
These halo stars are grouped together in giant structures that orbit the center of our galaxy, above and below the flat disk of the Milky Way.
«The motions allowed us to tell if they were disk stars, bulge stars, or halo stars.»
«Optical measurements of the beryllium and boron abundances in halo stars have been achieved by the 10 meter KECK telescope and the Hubble Space Telescope.
Kapteyn's Star is a dim red subdwarf or main sequence (sdM0 - 1.5 or V), halo star (John E. Gizis, 1997, page 809; and NASA Star and Exoplanet Database), which is thought to be originally a member of the Milky Way galaxy's luminous halo.
These stars are relatively more metals rich than outer - halo stars, with around three times more heavy atoms such as iron and calcium.
Hence, halo stars are composed typically of only 0.1 percent metals, relatively «metal poor» compared to the «Population I» stars of the spiral disk.