Just like the Sun, only 10 times bigger?!?

They say this star, V1449 Aql, which is 10 times bigger than the Sun,
but due to it oscillations is similar to the Sun. Anybody know what
oscillations of the Sun they are talking about that made it unique until
they discovered this star's oscillations?

Yousuf Khan

Scientists stumble upon sun-like massive star
"Scientists have reportedly discovered a massive star 10 times the mass
of the sun, but with similar oscillations, which could help studies on
the interiors of celestial bodies, besides understanding the reasons
behind the fluctuations inside the sun."
http://www.deccanherald.com/content/...e-massive.html

On Mon, 22 Jun 2009 19:35:07 -0400, Yousuf Khan
wrote:

They say this star, V1449 Aql, which is 10 times bigger than the Sun,
but due to it oscillations is similar to the Sun. Anybody know what
oscillations of the Sun they are talking about that made it unique until
they discovered this star's oscillations?

Yousuf Khan

Scientists stumble upon sun-like massive star
"Scientists have reportedly discovered a massive star 10 times the mass
of the sun, but with similar oscillations, which could help studies on
the interiors of celestial bodies, besides understanding the reasons
behind the fluctuations inside the sun."
http://www.deccanherald.com/content/...e-massive.html

Perhaps this is in reference to those 110,000 year solar output cycles
that are the cause of the glacial/interglacial cycles on Earth. Gordon

On Jun 23, 11:35*am, Yousuf Khan wrote:
They say this star, V1449 Aql, which is 10 times bigger than the Sun,
but due to it oscillations is similar to the Sun. Anybody know what
oscillations of the Sun they are talking about that made it unique until
they discovered this star's oscillations?

* * * * Yousuf Khan

Scientists stumble upon sun-like massive star
"Scientists have reportedly discovered a massive star 10 times the mass
of the sun, but with similar oscillations, which could help studies on
the interiors of celestial bodies, besides understanding the reasons
behind the fluctuations inside the sun."http://www.deccanherald.com/content/9494/scientists-stumble-sun-like-...

They mean the wobble that the gravitational effect of the planets have
on our sun. the sun is not stationary in position - besides any
rotation I mean.

Hardy

"Yousuf Khan" wrote in message
...
They say this star, V1449 Aql, which is 10 times bigger than the Sun, but
due to it oscillations is similar to the Sun. Anybody know what
oscillations of the Sun they are talking about that made it unique until
they discovered this star's oscillations?

Yousuf Khan

Scientists stumble upon sun-like massive star
"Scientists have reportedly discovered a massive star 10 times the mass of
the sun, but with similar oscillations, which could help studies on the
interiors of celestial bodies, besides understanding the reasons behind
the fluctuations inside the sun."
http://www.deccanherald.com/content/...e-massive.html

This is a beta Cephei star, an early B-type that varies with small amplitude
oscillations. It is not a solar type star.

The "sun-like" aspect is that the oscillations seen in higher (radial and
?non radial? modes) resemble the frequency pattern seen in the Sun. The
Sun's interior structure can be probed using such oscillations so the hope
is that the interior structure of V1449 Aql can also be explored by the same
methods. Otherwise this star is a very different sort of beast.

These methods were used to show, for example, that the solar core actually
has the amount of helium depletion that corresponds to stellar-evolutionary
calculations for a 1-solar-mass star of age 4.56 billion years. So maybe
something similar can be done for this beta Cephei star.

"Stumble" is not quite right. The star was on the CoRoT list of stars to be
intensively studied, so they already thought it might provide some
interesting results. It was no accident.

--
Mike Dworetsky

(Remove pants sp*mbl*ck to reply)

On Jun 22, 6:39 pm, Sam Wormley wrote:

The team’s lab tests indicate that the ratio of boron-11 and boron-12 isotopes
incorporated from seawater into the calcium carbonate shells of a marine microorganism
called Globigerinoides sacculifer depends on the pH of the water in which the creatures
lived. That pH, in turn, depends on the concentration of carbon dioxide in the air,
because the gas forms an acid when it dissolves in water. So, the scientists propose that
chemical analyses of G. sacculifer shells in ancient sediments should give an indirect
measure of the atmosphere’s past carbon dioxide levels.

I'm pretty sure boron-12 does not occur in nature. And this proxy
seems dubious as
over long times one would think the CO2 changes would be mostly
neutralised by the
dissolution of rock.

Andrew Usher

On Jun 23, 8:41*am, "Mike Dworetsky"
wrote:
This is a beta Cephei star, an early B-type that varies with small amplitude
oscillations. *It is not a solar type star.

The "sun-like" aspect is that the oscillations seen in higher (radial and
?non radial? modes) resemble the frequency pattern seen in the Sun. *The
Sun's interior structure can be probed using such oscillations so the hope
is that the interior structure of V1449 Aql can also be explored by the same
methods. *Otherwise this star is a very different sort of beast.

These methods were used to show, for example, that the solar core actually
has the amount of helium depletion that corresponds to stellar-evolutionary
calculations for a 1-solar-mass star of age 4.56 billion years. *So maybe
something similar can be done for this beta Cephei star.

"Stumble" is not quite right. *The star was on the CoRoT list of stars to be
intensively studied, so they already thought it might provide some
interesting results. It was no accident.

So, does this mean that they are able to see the whole stellar disk of
this star on some telescopes, rather than just being a point of light?
How else would they be able to see vibrations and oscillations on the
star?

YKhan wrote:
On Jun 23, 8:41 am, "Mike Dworetsky"
wrote:
This is a beta Cephei star, an early B-type that varies with small amplitude
oscillations. It is not a solar type star.

The "sun-like" aspect is that the oscillations seen in higher (radial and
?non radial? modes) resemble the frequency pattern seen in the Sun. The
Sun's interior structure can be probed using such oscillations so the hope
is that the interior structure of V1449 Aql can also be explored by the same
methods. Otherwise this star is a very different sort of beast.

These methods were used to show, for example, that the solar core actually
has the amount of helium depletion that corresponds to stellar-evolutionary
calculations for a 1-solar-mass star of age 4.56 billion years. So maybe
something similar can be done for this beta Cephei star.

"Stumble" is not quite right. The star was on the CoRoT list of stars to be
intensively studied, so they already thought it might provide some
interesting results. It was no accident.

So, does this mean that they are able to see the whole stellar disk of
this star on some telescopes, rather than just being a point of light?
How else would they be able to see vibrations and oscillations on the
star?


The usual way - spectroscopy and doppler shifts. Have you thought of
buying yourself a good undergraduate textbook so you can find out some
of the basic techniques used in scientific astronomy?

OG wrote:
YKhan wrote:
So, does this mean that they are able to see the whole stellar disk of
this star on some telescopes, rather than just being a point of light?
How else would they be able to see vibrations and oscillations on the
star?


The usual way - spectroscopy and doppler shifts. Have you thought of
buying yourself a good undergraduate textbook so you can find out some
of the basic techniques used in scientific astronomy?

How do you see vibrations through spectroscopy and doppler shifts?

Yousuf Khan

"OG" wrote in message
...
YKhan wrote:
On Jun 23, 8:41 am, "Mike Dworetsky"
wrote:
This is a beta Cephei star, an early B-type that varies with small
amplitude
oscillations. It is not a solar type star.

The "sun-like" aspect is that the oscillations seen in higher (radial
and
?non radial? modes) resemble the frequency pattern seen in the Sun. The
Sun's interior structure can be probed using such oscillations so the
hope
is that the interior structure of V1449 Aql can also be explored by the
same
methods. Otherwise this star is a very different sort of beast.

These methods were used to show, for example, that the solar core
actually
has the amount of helium depletion that corresponds to
stellar-evolutionary
calculations for a 1-solar-mass star of age 4.56 billion years. So
maybe
something similar can be done for this beta Cephei star.

"Stumble" is not quite right. The star was on the CoRoT list of stars
to be
intensively studied, so they already thought it might provide some
interesting results. It was no accident.

So, does this mean that they are able to see the whole stellar disk of
this star on some telescopes, rather than just being a point of light?
How else would they be able to see vibrations and oscillations on the
star?


The usual way - spectroscopy and doppler shifts. Have you thought of
buying yourself a good undergraduate textbook so you can find out some of
the basic techniques used in scientific astronomy?

CoRoT is a precision photometry instrument--it doesn't use spectroscopy
AFAIK.

The solar oscillations are, however, observed through high-precision doppler
spectroscopy, because extremely accurate photometry of the sun is difficult.

All stars other than the sun are observed as points of light (with
exceptions for interferometric studies). The frequencies emerge from the
Fourier Transform of the light variations.

--
Mike Dworetsky

(Remove pants sp*mbl*ck to reply)

"Mike Dworetsky" wrote in message
o.uk...
"OG" wrote in message
...
The "sun-like" aspect is that the oscillations seen in higher (radial
and
?non radial? modes) resemble the frequency pattern seen in the Sun.
to be
intensively studied, so they already thought it might provide some
interesting results. It was no accident.

So, does this mean that they are able to see the whole stellar disk of
this star on some telescopes, rather than just being a point of light?
How else would they be able to see vibrations and oscillations on the
star?


The usual way - spectroscopy and doppler shifts. Have you thought of
buying yourself a good undergraduate textbook so you can find out some of
the basic techniques used in scientific astronomy?

CoRoT is a precision photometry instrument--it doesn't use spectroscopy
AFAIK.

Very true, thanks for the correction.

The solar oscillations are, however, observed through high-precision
doppler spectroscopy, because extremely accurate photometry of the sun is
difficult.

So only half wrong then :-)

All stars other than the sun are observed as points of light (with
exceptions for interferometric studies). The frequencies emerge from the
Fourier Transform of the light variations.