Red Stars

We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused. That begs the question is it this iron that causes it to turn
red and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.

I dont think it is iron.... It is helium that is created in fusion and less
efficient in creating more. My guess is that helium traps/convert some
energy thus stars become red giant.



"G=EMC^2 Glazier" wrote in message
...
We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused. That begs the question is it this iron that causes it to turn
red and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.

"G=EMC^2 Glazier" wrote in message
...
We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused.

"Stars less massive than about 4M(Sun) never develop the necessary central
pressures or temperatures to ignite thermonuclear reactions that use carbon
or oxygen as fuel. Instead, as we have seen, the process of mass ejection
just strips away the star's outer layers and leave behind the hot
carbon-oxygen core. With no thermonuclear reactions taking place, the core
simply cools down like a dying ember."
- Universe, Kaufmann & Freedman -



That begs the question is it this iron that causes it to turn
red and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.

"G=EMC^2 Glazier" wrote in message
...
We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused.

That begs the question is it this iron that causes it to turn
red

Google ""blackbody radiation"


and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.

On Sat, 7 Feb 2004 07:32:58 -0500 (EST), (G=EMC^2
Glazier) wrote:

We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused. That begs the question is it this iron that causes it to turn
red and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.
90 % of the stars of the galaxy are red dwarf. they are red because they burn
ther hydrogen very slowly so they are... cold!

Red giants are red because the inner pressure of helium fusion is great and
expand the outer layers far away from the star. Now these layers are colder so
they appear red. ( but the center is very very hot! ).
Good night!

Benoît Morrissette

(G=EMC^2 Glazier) wrote in news:2238-4024DAFA-7
@storefull-3171.bay.webtv.net:

We know 90% of the stars in our galaxy are the same as our sun. We know
they can last 10 billion years. When they have used up all atoms that
can keep their fusion core going they create iron atoms,and that can't
be fused. That begs the question is it this iron that causes it to turn
red and expand out hundreds of millions of miles? If they are 90% of
all stars in our galaxy and not to many red giants do we see,Can we then
assume that sun like stars were born close to the same time?(medium star
burst spacetime) Seems from this we can tell the
history of galaxies. Galaxies with 90% of red giants older than the
Milky Way. Galaxies with 90% of white dwarfs older than red giant
galaxies etc Bert.


The visual colour (color for the yanks) of stars is related mostly to their
temperature, not their composition. Red giants are reddish because they are
relatively cool. Just like the element of an electric stove. You don't see
the color resulting from higher temperatures because at those temperatures
the electric element would melt and then vaporise. The surface of Sun at ~
6,000 K appears yellow-white. Hot stars have a searing white to blueish
look.

L.

Hi L Could the red (colour Brits) be due to light coming out of the red
giant's core is traveling though a lot of gas and dust before coming out
its surface? It does shrink back to a small very dense White Dwarf.
Bert

(G=EMC^2 Glazier) wrote in news:2238-4027A404-302
@storefull-3171.bay.webtv.net:

Hi L Could the red (colour Brits) be due to light coming out of the red
giant's core is traveling though a lot of gas and dust before coming out
its surface? It does shrink back to a small very dense White Dwarf.
Bert



No. It's mainly blackbody radiation from the surface of the star.

L.

On Mon, 9 Feb 2004 10:15:16 -0500 (EST), (G=EMC^2
Glazier) wrote:

Hi L Could the red (colour Brits) be due to light coming out of the red
giant's core is traveling though a lot of gas and dust before coming out
its surface? It does shrink back to a small very dense White Dwarf.
Bert
Photons from the core are absorbed and then re-emitted many times before
reaching the outer layer of the star. I have read somewhere that it can takes
millions of years for a photon to reach the surface that way...


Good night!

Benoît Morrissette

Hi Benoit It takes the photons from the sun's core 100,000 years to go
from core to surface. That is the reasoning I use when they tell us
very cold sodium slows light to 3 miles per hour. The photon never
slows down. Bert