brown dwarfs that are metal poor found
- notFritzArgelander
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brown dwarfs that are metal poor found
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
- Graeme1858
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Re: brown dwarfs that are metal poor found
Would you not expect a 10 billion year old star, formed when there was far less metallicity, to be low in iron?
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Graeme
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Graeme
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Celestron 9.25 f10 SCT, f6.3FR, CGX mount.
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ZWO EFW, ZWO OAG, ASI220MM Mini.
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https://www.averywayobservatory.co.uk/
- notFritzArgelander
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Re: brown dwarfs that are metal poor found
Yes. Iron abundance correlates very well with age.Graeme1858 wrote: ↑Sat Jul 11, 2020 9:03 am Would you not expect a 10 billion year old star, formed when there was far less metallicity, to be low in iron?
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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
- Buckethead 2.0
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Re: brown dwarfs that are metal poor found
Hmmm, stars gain iron and humans lose iron as they age.
~Eric
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- notFritzArgelander
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Re: brown dwarfs that are metal poor found
Well...... older stars have less iron since when they are born there is less iron in the universe. The only stars that gain iron as they age are more massive objects that go through a supernova. The Sun, for instance, isn't massive enough to ever make iron.Buckethead 2.0 wrote: ↑Sat Jul 11, 2020 8:04 pm Hmmm, stars gain iron and humans lose iron as they age.
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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Re: brown dwarfs that are metal poor found
notFritzArgelander wrote: ↑Sat Jul 11, 2020 8:23 pmWell...... older stars have less iron since when they are born there is less iron in the universe. The only stars that gain iron as they age are more massive objects that go through a supernova. The Sun, for instance, isn't massive enough to ever make iron.Buckethead 2.0 wrote: ↑Sat Jul 11, 2020 8:04 pm Hmmm, stars gain iron and humans lose iron as they age.
Oh yes, I remember now from last time we discussed this. I'm learning friend, however slow it may be.
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Re: brown dwarfs that are metal poor found
I assume that the iron formed in the core of massive stars is distributed throughout the universe via supernovae. Hence, for iron to be in abundance in the solar system then there would have to have been relatively nearby SN's prior to the sun's formation. I suppose that span of time would have been about 10 billion years.
-Michael
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Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
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