studying the first stars through their children

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notFritzArgelander
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studying the first stars through their children

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Post by notFritzArgelander »


Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Michael131313 Mexico
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Re: studying the first stars through their children

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Post by Michael131313 »


Thanks n_FA. Is one part in 50 billion enough to identify it as a second generation star?
ES AR 102 102mm, f/6.5, ES 254mm f/5 DOB, Obie 10x50, GSO SV 30mm, ES 68° 20mm, ES 82° 14mm, 11mm, 8.8 mm, 6.8mm, 4.7mm. Twilight 1 mount.
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Re: studying the first stars through their children

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Post by notFritzArgelander »


Michael131313 wrote: Thu Aug 01, 2019 6:00 pm Thanks n_FA. Is one part in 50 billion enough to identify it as a second generation star?
Not quite actually. By itself that isn't enough. The number that is intriguing is more the fraction of iron w.r.t. the Sun at 1/1,500,000. That is more convincing.

But the abstract of the paper makes the case much better. It's the pattern of enrichment and depletion that makes the case, not just the Fe abundance.

https://academic.oup.com/mnrasl/article ... m=fulltext
We report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [Fe/H]=−6.2±0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbon-enhanced, [C/Fe]=3.9±0.2⁠, while other abundances are compatible with an α-enhanced solar-like pattern with [Ca/Fe]=0.4±0.2, [Mg/Fe]=0.6±0.2⁠, [Ti/Fe]=0.8±0.2⁠, and no significant s- or r-process enrichment, [Sr/Fe]<0.2 and [Ba/Fe]<1.0 (3σ limits). Population III stars exploding as fallback supernovae may explain both the strong carbon enhancement and the apparent lack of enhancement of odd-Z and neutron-capture element abundances. Grids of supernova models computed for metal-free progenitor stars yield good matches for stars of about 10M⊙ imparting a low kinetic energy on the supernova ejecta, while models for stars more massive than roughly 20M⊙ are incompatible with the observed abundance pattern.
So what that all tells me is that one and only one SN event contributed to this pattern of elemental enrichment over primordial.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Michael131313 Mexico
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Re: studying the first stars through their children

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Post by Michael131313 »


That is very interesting. Thanks
ES AR 102 102mm, f/6.5, ES 254mm f/5 DOB, Obie 10x50, GSO SV 30mm, ES 68° 20mm, ES 82° 14mm, 11mm, 8.8 mm, 6.8mm, 4.7mm. Twilight 1 mount.
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