Barnard 3

[afesan]

This is Barnard 3, a dusty, gassy region of the galaxy about a thousand light years away where young stars are lighting up their neighborhood.Complex molecules similar to soot, called polycyclic aromatic hydrocarbons or PAHs. .

 

So what’s going on here? Near the center is a F2 white-yellow star ( HD 278942)  which is brighter and hotter than our Sun, and is flooding the surrounding material with ultraviolet light and a fast wind of subatomic particles (like the Sun’s solar wind, but a whole lot stronger and with a much, much farther reach). This has carved out a gigantic cavity in that stuff, creating a bubble about 25 light years in diameter — that’s huge: 250,000,000,000,000 kilometers across, more than 10,000 times the size of our solar system!

 

 

The UV from the star is making the gas glow.In optical light (this object is a mess , with gas emitting light, reflecting light, and dust absorbing it. When gas is lit up this way around a star, it’s called a Strömgren sphere, after the astronomer Bengt Strömgren who did the first theoretical work on them.

An infrared image of the area can be seen here:http://wise.ssl.berkeley.edu/gallery_Barnard3.html

 

Credit: (Phil Plait, Discover Magazine, December 2011)

 

 

Link to more info and high resolution  image: http://afesan.es/Deepspace/slides/Barnard%203%20%28Perseus%29.html

 

CS ¡

Antonio

 

 

 

[MarkS]

Very nice, Antonio!

 

Interesting image- the more so because it is really out of reach from here.

 

Regards,

Mark

[afesan]

Thanks Mark ¡..