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January 30th, 2008del.icio.us Digg Reddit Netscape StumbleUpon
A Young Star Grows Up
Written by Nancy Atkinson


Remember when you were young and how Mom always told you to eat everything on your plate so you would get big? Well, there’s a young star heeding that advice about 2,600 light years from Earth in the constellation Monoceros (The Unicorn.) Known as MWC 147, this young stellar object is devouring everything on its “plate,” the disk of gas and dust that surrounds it. Astronomers are witnessing how this star is gaining mass, and is on its way to becoming an adult.

Using the Very Large Telescope Interferometer, ESO (European Organization for Astronomical Research in the Southern Hemisphere) astronomers have peered into the disc of material surrounding MWC 147, witnessing how the star gains its mass as it matures. This star is increasing in mass at a rate of seven millionths of a solar mass per year. Ah, these young stars. It seems like they grow up so fast these days.

MWC 147 is less than half a million years old. If our 4.6 billion year old Sun is considered to be middle-aged, MWC 147 would be a 1-day-old baby. This star is in the family of Herbig Ae/Be objects. These are stars that have a few times the mass of our Sun and are still forming, increasing in mass by swallowing material present in a surrounding disc.

Being 6.6 times more massive than the Sun, however, MWC 147 will only live for about 35 million years, or to draw again the comparison with a person, about 100 days, instead of the 80 year equivalent of our Sun.

We’re still learning about the morphology of the inner environment of these young stars, and everything we can discover helps us to better understand how stars and their surrounding planets form.

The observations by the ESO astronomers show that the temperature changes in this area are much steeper than predicted by current models, indicating that most of the near-infrared emission emerges from hot material located very close to the star, within one or two times the Earth-Sun distance (1-2 AU). This also implies that dust cannot exist so close to the star, since the strong energy radiated by the star heats up and ultimately destroys the dust grains.

"We have performed detailed numerical simulations to understand these observations and reached the conclusion that we observe not only the outer dust disc, but also measure strong emission from a hot inner gaseous disc. This suggests that the disc is not a passive one, simply reprocessing the light from the star," explained astronomer Stefan Kraus. "Instead, the disc is active, and we see the material, which is just transported from the outer disc parts towards the forming star."

Also of note is the beautiful image of the region surrounding MWC 147, which I’ll post below. The number of stars in this image is incredible, and is reminiscent of the “grains of sand” comment by Carl Sagan. This is a wide field image taken by Stéphane Guisard of ESO with a 200 mm lens.


Original News Source: ESO Press Release

Filed under: Astronomy

4 Responses to “A Young Star Grows Up”
Lee Says:
January 30th, 2008 at 11:18 am
" located very close to the star about, within one or two times the Earth-Sun distance "
Not to pick nit to TOO great a degree, but copyreading/proofreading would help these articles a lot. I rarely run across one that doesn't have at least one grammar/syntax/spelling error in it. If modern times sees the death of Good English, let's not contribute to that through simple neglect. I appreciate the knowledge and expertise that goes into the science of these articles, but simple errors just put a big speed bump (at least for me) in the middle of comprehension.
Sorry for the rant, great article otherwise.

Nancy Atkinson Says:
January 30th, 2008 at 1:47 pm
Thanks, Lee for catching that typo. It's now been fixed, and hopefully the death of Good English has been averted for one more day!
Nancy

David Madison, Sr. Says:
January 31st, 2008 at 5:18 am
My companion has multiple advanced college degrees. She will spot a spelling, grammar, syntax, or organizational error in my astronomy writing faster than the cat goes in and out the front door. It is not so much the imperfections in English that give me the speed bumps, but uncertainties in the content.

It is hard to determine if the article shows the two substantially different images of MWC-147 in the same orientation. The color filters are different, and the protostar is tiny.

The protostar is 500,000 years old, gains a solar mass every seven million years, but has 6.6 solar masses. The mass accretion speed was almost a hundred times what it is. It has slowed so much that it could be useful to say it has reached a different stage in its life. This asks how you draw that line.

Our sun will live perhaps 10,000 million years on the main sequence, and this one only 35 million years. There is no intuitively obvious ratio between their masses and their life spans. It would be helpful to show how we calculate this difference.

Hanchai Sawangned Says:
January 31st, 2008 at 10:31 pm
Born, Old, Sick, Reborn…is it?
Live Nature
Circle of Life

Pi = 3.1428… = 22/7 [Approximately]…infinity…the end is origin
or
Pi = Lenght of Circle / Diameter

PI = 3.1415926…[usa]…infinity…the end is origin

it's mean infinity can solve by Circle [O-Ring]
and H-Atom Shape is Circle [O-Ring]&electron[Quantum-Style],…all Periodic Elements of Table too.

Human Nature is formed from infinity-state[elements].

A Car is infinity-state too.

The Earth is cover by Air & No-Air [A-Bubble Earth], why is it not exploded in space [vacuum-state]?

etc.
So Infinity is the key to make "Time Machine".
And The Universe Driver Too., is it or not? please verify?

1/1=1, 1/0=8[infinity] so 0/0=1 & 8[infinity] is it?
1/1=1, 0 & 8[infinity] is it?
form [1/1]*0/0=[1/0]*0=8[infinity]*0=0
and [1/1]*0/0=[1*0]/0=0/0=1 & 8[infinity]
Quantum Mechanic The-o-ry [Planck & Einstein] can solve these, is it? & It's Balance-State, is it? [May be Time & Temperature (Enthalphy) Balance-State] is it?
http://www.google.com/search?sourceid=gmail&q=Planck
http://en.wikipedia.org/wiki/Max_Planck
http://www.google.com/search?hl=th&q=Einstein&lr=
http://en.wikipedia.org/wiki/Albert_Einstein
http://en.wikipedia.org/wiki/Bose%E2%80%93Einstein_condensate
http://www.google.com/search?sourceid=gmail&q=Teleportation

or
Quantum Computer [Bose Einstein Condensate Theory=Stop Light Speed to be Zero] by now can 2.7 cm/second is it?

1st draft report of "Time Machine" will finish the end of 20080229, And 1st Final Report of "Time Machine" will Press Release on 2028.
By Hanchai Sawangned
99/88 Bangkok Boulevard Ramindra, Bangkok13-Pinnacle Zone, Golden Jubilee 010/1 {BMA], Ramindra-TheRing-Nawamintr 74-Nualjan-Rachadapisek ROAD, CANNAYAO, BANGKOK 10230, THAILAND
Tel: 66(0)23477052, Fax: 66(0)25083513