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View Full Version : What's in that Dust Cloud?



Fraser
2005-Oct-04, 04:09 PM
SUMMARY: Astronomers knew something was hiding inside a dark, dusty cloud, but they weren't sure exactly what it was. The Spitzer Space Telescope confirmed a faint infrared object within the cloud. But by focusing the Hawaii-based Submillimeter Array on the object, astronomers learned that the hidden object has a weak outflow of material, which was predicted by star formation theories. This revealed the object to be a young star, perhaps only 10,000 to 100,000 years old with only 25 times the mass of Jupiter.

View full article (http://www.universetoday.com/am/publish/whats_in_that_cloud.html)
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galacsi
2005-Oct-04, 06:18 PM
Hi

What is the mass limit between a brown dwarf and a true star ? Under or above 25 jupiter ?

antoniseb
2005-Oct-04, 06:57 PM
What is the mass limit between a brown dwarf and a true star ? Under or above 25 jupiter ?

Generally it is given as around 75 Jupiter masses. The story suggests that this object is still accreting material. When you get down to the limit, there is some size at which a protostar can get some energy briefly by destroying its lithium supply. This is probably around 65 Jupiter masses.

galacsi
2005-Oct-04, 08:07 PM
Generally it is given as around 75 Jupiter masses. The story suggests that this object is still accreting material. When you get down to the limit, there is some size at which a protostar can get some energy briefly by destroying its lithium supply. This is probably around 65 Jupiter masses.

And deuterium too no ?