Dwarf nova SS Cygnus

[blobrana]

"Astronomers have discovered a previously unexpected astronomical phenomenon – a radio jet in a star system where none had been expected – which suggests that all stars and black holes feed in the same way."

Read more (http://www.southampton.ac.uk/mediacentre/news/2008/jun/08_105.shtml)

[draqon]

black holes are powered by accretion or when matter falls unto a compact object...this process gives rise to x-ray jets originated from the black hole.

However dwarf novae seems to have been not producing these jets...however they have been found now to produce it too.

On a side note...I dont understand why dwarf novae's jets have not been observed before and can be observed now...

[blobrana]

I dont understand why dwarf novae's jets have not been observed before and can be observed now...[/I]

Yes, it seems strange,
but others perhaps did not have the equipment, or did not look closely enough, or were just plain unlucky.

“For the first time, researchers were able to obtain a detailed radio light-curve of a dwarf nova in outburst.”

[kaneda]

Dwarf novae occurs when the gas in an accretion disk collapses onto a dwarf star. Luminosity is low as is the increase in luminosity which is probably hidden by a much brighter non-dwarf companion star.

[draqon]

Dwarf novae occurs when the gas in an accretion disk collapses onto a dwarf star. Luminosity is low as is the increase in luminosity which is probably hidden by a much brighter non-dwarf companion star.

but is the x-ray emmited also low? Does luminosity also means it includes x-rays in it?