It is also known to be a luminous blue variable
, which is an evolved star that displays unpredictable variations when it comes to its brightness and spectra.
"This particular source of gamma rays was found towards an unusual cluster of stars which harbours one of the Milky Way's most massive and energetic young stars, a luminous blue variable
star called LBV1806-20," says Associate Professor Gavin Rowell, from the University of Adelaide's High Energy Astrophysics Group and leader of Australia's participation in HESS.
But the object's narrow Fe-II emission lines and 2.5-magnitude spike in 2001 better match a luminous blue variable
star going supernova.
Grosso et al., "MWC 930--a new luminous blue variable
candidate," Monthly Notices of the Royal Astronomical Society, vol.
Reports from star surveys update the search for Wolf-Rayet stars, O stars, galactic star clusters, massive star nebulae, and luminous blue variable
A prompt response was received from Andrea Pastorello et.al., Dipartimento di Astronomia, Universita di Padova, that a spectrum of of Sept 30 suggested it might be an eruption of a luminous blue variable
(LBV), often referred to as a 'supernova imposter'.
The progenitor may have been a very massive type of star known as a luminous blue variable
. Such a star is born with more than 40 times the mass of our Sun, but it sheds much of this material by way of fierce stellar winds.
Comparing them to older, ground-based pictures, the researchers found a rare type of star called a luminous blue variable
Although SN 2006jc's progenitor was not observed directly, it behaved like a Luminous Blue Variable
. LBVs are extremely hot and massive stars that occasionally eject their outer layers in violent outbursts.
Classified in this phase as a luminous blue variable
, AG Carinae is some 50 times more massive than the sun.
Such objects are known as luminous blue variables
(LBVs), stars that have nearly exhausted their hydrogen fuel, and, for reasons, which are poorly understood, undergo brief recurrent episodes of explosive mass loss.
During this stage, heavy stars such as Eta Carinae are known as luminous blue variables
. This phase lasts for less than 100,000 years--a mere blink in astronomical time.