Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New Star Systems First of Their Kind

04.04.2008
Two binary star systems could explode as yellow supergiants

Researchers funded by the National Science Foundation (NSF) announced today in Astrophysical Journal Letters that they have discovered a faraway binary star system that could be the progenitor of a rare type of supernova.

The two yellow stars, which orbit each other and even share a large amount of stellar material, resemble a peanut. The Ohio State University astronomers and their colleagues believe the two stars in the system, 13 million light years away and tucked inside a small galaxy known as Holmberg IX, appear to be nearly identical, each 15 to 20 times the mass of our Sun.

This work was funded through an NSF continuing grant to support a systematic study of the most massive stars in the local universe. The study is expected to yield masses and radii for dozens of massive stars discovered in a variety of environments. The data produced can be used to test models of massive star atmospheres, winds, and how they evolve both as single stars and in binaries.

"To have discovered a pair of massive interacting stars in this configuration is truly exceptional--sort of like rare squared," said NSF Program Manager Michael Briley. "There is a lot these stars can tell us about how they work and how they influence their environment. But the really exciting part is they may also hold the key to finally understanding why some massive yellow stars explode."

Lead author Jose Prieto, an Ohio State graduate student who analyzed the new system as part of his doctoral dissertation, searched the historical record to see whether his group had found the first such binary. In a surprising twist, his search uncovered another similar system less than 230,000 light years away in the Small Magellanic Cloud, a small galaxy that orbits the Milky Way. The second binary star system was discovered in the 1980s but misidentified at the time. Prieto reassessed the data and realized the system was another yellow super-giant eclipsing binary. Prieto and his colleague suspect the yellow binary systems could be the progenitors of rare supernova linked to yellow supergiants.

Most stars end their life in a supernova at the cooler red end of the temperature scale and a few end in the hotter blue end, Pietro said. Astronomers didn't believe stars would end during the short transitional phase in between--until now.

"When two stars orbit each other very closely, they share material, and the evolution of one affects the other," Prieto said. "It's possible two supergiants in such a system would evolve more slowly and spend more time in the yellow phase--long enough that one of them could explode as a yellow supergiant."

Diane Banegas | EurekAlert!
Further information:
http://www.nsf.gov
http://www.nsf.gov/news/news_summ.jsp?cntn_id=111349&org=NSF&from=news

More articles from Physics and Astronomy:

nachricht Temperature-controlled fiber-optic light source with liquid core
20.06.2018 | Leibniz-Institut für Photonische Technologien e. V.

nachricht New material for splitting water
19.06.2018 | American Institute of Physics

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Creating a new composite fuel for new-generation fast reactors

20.06.2018 | Materials Sciences

Game-changing finding pushes 3D-printing to the molecular limit

20.06.2018 | Materials Sciences

Could this material enable autonomous vehicles to come to market sooner?

20.06.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>