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Flourine - Stars

slo1
Posts: 4,353
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8/22/2014 8:48:16 AM
Posted: 2 years ago
It is important to remember, while there are hypothesis of elements lighter than iron being formed in a star's pre supernova life time, there is still uncertainty there for some elements and further evidence is needed. Looks like the evidence of fluorine in the later stages of stars similar to the sun has been obtained allowing science to favor one of three hypothesis that best matches the data.

So, while we all knew fluorine came from stars, you can feel comfortable knowing that the fluorine in your toothpaste is really billions of years old.

http://www.sciencedaily.com...

With doctoral student Henrik J"nsson and colleagues from Ireland and the US, he has studied stars formed at different points in the history of the universe to see if the amount of fluorine they contain agrees with the predictions of the theory.

By analysing the light emitted by a star, it is possible to calculate how much of different elements it contains. Light of a certain wavelength indicates a certain element. In the present study, the researchers used a telescope on Hawaii and a new type of instrument that is sensitive to light with a wavelength in the middle of the infrared spectrum. It is in this area that the signal is found in this case.
"Constructing instruments that can measure infrared light with high resolution is very complicated and they have only recently become available," said Nils Ryde.

Different chemical elements are formed at high pressure and temperature inside a star. Fluorine is formed towards the end of the star's life, when it has expanded to become what is known as a red giant. The fluorine then moves to the outer parts of the star. After that, the star casts off the outer parts and forms a planetary nebula. The fluorine that is thrown out in this process mixes with the gas that surrounds the stars, known as the interstellar medium. New stars and planets are then formed from the interstellar medium. When the new stars die, the interstellar medium is enriched once again.
Envisage
Posts: 3,646
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8/22/2014 11:06:20 AM
Posted: 2 years ago
At 8/22/2014 8:48:16 AM, slo1 wrote:
It is important to remember, while there are hypothesis of elements lighter than iron being formed in a star's pre supernova life time, there is still uncertainty there for some elements and further evidence is needed. Looks like the evidence of fluorine in the later stages of stars similar to the sun has been obtained allowing science to favor one of three hypothesis that best matches the data.

So, while we all knew fluorine came from stars, you can feel comfortable knowing that the fluorine in your toothpaste is really billions of years old.

http://www.sciencedaily.com...

With doctoral student Henrik J"nsson and colleagues from Ireland and the US, he has studied stars formed at different points in the history of the universe to see if the amount of fluorine they contain agrees with the predictions of the theory.

By analysing the light emitted by a star, it is possible to calculate how much of different elements it contains. Light of a certain wavelength indicates a certain element. In the present study, the researchers used a telescope on Hawaii and a new type of instrument that is sensitive to light with a wavelength in the middle of the infrared spectrum. It is in this area that the signal is found in this case.
"Constructing instruments that can measure infrared light with high resolution is very complicated and they have only recently become available," said Nils Ryde.

Different chemical elements are formed at high pressure and temperature inside a star. Fluorine is formed towards the end of the star's life, when it has expanded to become what is known as a red giant. The fluorine then moves to the outer parts of the star. After that, the star casts off the outer parts and forms a planetary nebula. The fluorine that is thrown out in this process mixes with the gas that surrounds the stars, known as the interstellar medium. New stars and planets are then formed from the interstellar medium. When the new stars die, the interstellar medium is enriched once again.


The link to the paper is here: http://iopscience.iop.org...

The fluorine exists as hydrogen fluoride *shivers*. Nasty nasty stuff...

Might be interesting to look up the other 2 hypothesis: "asymptotic giant branch (AGB) stars, _7; nucleosynthesis in Type II supernovae, and/or the winds of Wolf-Rayet stars."

I am guessing the wind hypothesis is Neon-Proton capture, similar to how Helium-3 is produced on the moon.