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HE 1523-0901 is the designation given to a red giant star in the Milky Way galaxy approximately 9,900 light-years from Earth. It is thought to be a second generation, Population II, or metal-poor, star ([Fe/H] = −2.95). The star was found in the sample of bright metal-poor halo stars from the Hamburg/ESO Survey by Anna Frebel and
By definition, each population group shows the trend where lower metal content indicates higher age of stars. Hence, the first stars in the universe (very low metal content) were deemed population III, old stars (low metallicity) as population II, and recent stars (high metallicity) as population I. [6] The Sun is considered population I, a ...
HE 1327-2326, discovered in 2005 by Anna Frebel and collaborators, [2] was the star with the lowest known iron abundance until SMSS J031300.36−670839.3 was discovered. [5] The star is a member of Population II stars , with a solar-standardised iron to hydrogen index [Fe/H], or metallicity , of −5.4±0.2.
This means that SDSS J0018−0939 most likely preserved the elemental abundance ratios produced by a first-generation very-massive star. [7] First generation stars are expected to self-regulate their growth by radiative feedback in the formation process, and to achieve masses typically tens of times that of the Sun. A fraction of stars might ...
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The compressed version of the First Generation DSS was published by the STScI and the Astronomical Society of the Pacific (ASP) on 102 CD-ROMs in 1994, under the name "Digitized Sky Survey." [ 24 ] It has also been made available online by the STScI [ 25 ] [ 26 ] and several other facilities in databases that can be queried over the web.
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