Student and professor solve astronomical mystery

Apr 08, 2013 by Mike Mcdade

( —To ordinary folks, stars in the galaxy may seem like tiny specks of light. But to Penn State Brandywine Professor Timothy Lawlor and undergraduate researcher Nick Rufo, one of those bright balls of gas is actually more massive than scientists originally reported and holds implications for understanding the evolution of the universe.

Research conducted by Rufo and Lawlor about the irregular characteristics of what is known as "Caffau's Star" suggests that it could actually be considered part of the subgiant category rather than a main sequence star. Translation: Caffau's Star could actually be much more immense than initially described. This finding plays an important role in strengthening the understanding of and helps researchers comprehend the evolution of the 13.8 billion-year-old universe.

"The puzzle of stellar evolution is really about the origin of every one of us," explained Lawlor, who is associate professor of physics. "One of the most fascinating things about and the evolution of the universe is how it becomes clear that a huge majority of all atoms that make up you, me and the entire planet can be traced back to the center of a very massive star that blew up long ago."

Rufo, who spent his first two years at the Brandywine campus and is now a meteorology major in the College of Earth and Mineral Sciences at University Park, worked closely with Lawlor to analyze data about Caffau's Star. He was able to complete calculations using a and produced all of the models that were compared to Caffau's Star in the research process.

"Nicholas was a dedicated researcher," Lawlor said. "He helped uncover that the mass did not fit that of a main sequence star, and that for the observed composition of to match, the star would have to be significantly less massive, which was not likely based on the temperature. Working with Nicholas was one of the most productive collaborations I have had with an undergraduate researcher."

While at the campus, Rufo participated in Penn State Brandywine's spring undergraduate research exhibition called EURECA, where he presented the beginning discoveries of the studies he conducted alongside Lawlor.

"I feel honored to have worked with a great professor like Dr. Lawlor," Rufo said. "I never imagined I would have an opportunity working with Dr. Lawlor on a paper and doing research on a fascinating subject like astronomy when I was a student at Brandywine. I really enjoyed the experience and feel it gave me confidence and motivation."

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User comments : 5

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1 / 5 (4) Apr 08, 2013
One of the most fascinating things about stellar evolution and the evolution of the universe is how it becomes clear that a huge majority of all atoms that make up you, me and the entire planet can be traced back to the center of a very massive star that blew up long ago.


Otherwise, the article has no content about the actual topic, and only has some quotes of astrophysicists patting one another on the back.
1 / 5 (2) Apr 08, 2013
If it is not too much of an effort, could the text please explain to your humble reader what was the result? A big star, a small star, a solution to the Li problem? Now the only thing that is clear, is that nothing is clear.
5 / 5 (2) Apr 08, 2013
From Wikipedia:
"SDSS J102915 172927 or Caffau's star is a population II star in the galactic halo, seen in the constellation Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy.[1] At the time of its discovery, it had the lowest metallicity of any known star.[2] It is small (less than 0.8 solar masses),[3] deficient in carbon, nitrogen, oxygen, and completely devoid of lithium."

So, what makes it unique is that it's very old, very low in "metals", and, according to some theories, shouldn't have been able to form in the first place. The idea is that, without heavier elements, the H/He cloud couldn't cool enough to collapse under its own gravity, given the low mass. If the mass is higher, that problem is solved, but higher mass stars don't live as long.
1 / 5 (3) Apr 09, 2013
Could this be a problem with the potential to be solved via electromagnetism? This site may reference this same star but since it is not identified (!) we do not know. http://www.dailyg...rse.html
There are in the GMC other can't-be heavy stars. So instead of adjusting current star formation theory should we instead consider a new theory?
5 / 5 (1) Apr 09, 2013
Could this be a problem with the potential to be solved via electromagnetism?


So instead of adjusting current star formation theory should we instead consider a new theory?

They aren't adjusting any theory, just making a more accurate measurement of the mass. That's the way it works. In this case the change makes the star less puzzling.

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