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Ancient star nearly as old as the Universe
- eansbro
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17 years 6 months ago #45844
by eansbro
Ancient star nearly as old as the Universe was created by eansbro
An ancient star slightly smaller than the Sun blazed into life in our galaxy, formed from the newly scattered remains of the first stars in the universe.
Astronomers have learned that a metal-poor star called HE 1523 is 13.2 billion years old-just slightly younger than 13.7 billion year age of the universe.
The findings are detailed in the May 10 issue of Astrophysical Journal.
www.space.com/scienceastronomy/070510_oldest_star.html
Eamonn A
Astronomers have learned that a metal-poor star called HE 1523 is 13.2 billion years old-just slightly younger than 13.7 billion year age of the universe.
The findings are detailed in the May 10 issue of Astrophysical Journal.
www.space.com/scienceastronomy/070510_oldest_star.html
Eamonn A
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17 years 6 months ago #45851
by albertw
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
Replied by albertw on topic Re: Ancient star nearly as old as the Universe
Preprint:
www.arxiv.org/abs/astro-ph/0703414
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
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- Mike
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17 years 6 months ago #45852
by Mike
I83 Cherryvalley Observatory
After one look at this planet any visitor from outer space would say; "I WANT TO SEE THE MANAGER".
Replied by Mike on topic Oldest Stars
Eamonn, Al, thanks for the info!
Very interesting indeed, what was even more interesting was the following statement by Frebel…
“While HE 1523 certainly ranks among the oldest stars in the Milky Way, it probably is not the oldest.â€This star has a certain metallicity by which we measure its chemical primitiveness, but there are other stars out there that are even more primitive in their natureâ€.
Does this mean we will eventually push the generally accepted 13.7 Billion year limit further out as even older stars (if they exist) are discovered?
For anyone that is interested here is an excellent all round presentation in PDF format entitled “The Oldest Stars in Our Galaxy†by Anna Frebel.
www.as.utexas.edu/astronomy/education/sp...secure/lecture23.pdf
Clear skies
Mike
Very interesting indeed, what was even more interesting was the following statement by Frebel…
“While HE 1523 certainly ranks among the oldest stars in the Milky Way, it probably is not the oldest.â€This star has a certain metallicity by which we measure its chemical primitiveness, but there are other stars out there that are even more primitive in their natureâ€.
Does this mean we will eventually push the generally accepted 13.7 Billion year limit further out as even older stars (if they exist) are discovered?
For anyone that is interested here is an excellent all round presentation in PDF format entitled “The Oldest Stars in Our Galaxy†by Anna Frebel.
www.as.utexas.edu/astronomy/education/sp...secure/lecture23.pdf
Clear skies
Mike
I83 Cherryvalley Observatory
After one look at this planet any visitor from outer space would say; "I WANT TO SEE THE MANAGER".
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17 years 6 months ago #45854
by albertw
Well if we find older stars then something will have to change!
The 'live fast die young' stellar process is the problem here though. Big bright stars are easier to study but these early stars will have gone supernova early on.
To find the most metal free stars we need to look for stars that have been around for 13-14 billion years. And that leaves us with just small dim stars, in the order of half a solar mass. Older stars are probably out there but detecting them, and then getting the spectral analysis to say anything about them is difficult. The analysis of this took 7.5 hours of observing on the VLT for example.
Whether any population III stars, the original stars made from just hydrogen clouds, will ever be found is another question.
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
Replied by albertw on topic Re: Oldest Stars
Does this mean we will eventually push the generally accepted 13.7 Billion year limit further out as even older stars (if they exist) are discovered?
Well if we find older stars then something will have to change!
The 'live fast die young' stellar process is the problem here though. Big bright stars are easier to study but these early stars will have gone supernova early on.
To find the most metal free stars we need to look for stars that have been around for 13-14 billion years. And that leaves us with just small dim stars, in the order of half a solar mass. Older stars are probably out there but detecting them, and then getting the spectral analysis to say anything about them is difficult. The analysis of this took 7.5 hours of observing on the VLT for example.
Whether any population III stars, the original stars made from just hydrogen clouds, will ever be found is another question.
Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/
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