But Nasty 1 doesn't look like a typical Wolf-Rayet star
. The astronomers using Hubble had expected to see twin lobes of gas flowing from opposite sides of the star, perhaps similar to those emanating from the massive star Eta Carinae, which is a Wolf-Rayet candidate.
Esteban, "The ionized gas at the centre of IC10: a possible localized chemical pollution by Wolf-Rayet stars
," Monthly Notices of the Royal Astronomical Society, vol.411, no.3, pp.
are extremely hot and energetic evolved stars of the live-fast-die-young category.
Before exploding, these stars, then known as Wolf-Rayet stars
, have lost their outer atmosphere and slimmed down to a mere 10 to 20 times the mass of the sun.
"The idea is that aluminum-26 flung from the Wolf-Rayet star
is carried outwards on grains of dust formed around the star.
Massey, "Spectroscopic studies of Wolf-Rayet stars
. V-Optical spectrophotometry of the emission lines in Small Magellanic Cloud stars," The Astrophysical Journal, vol.341, pp.113-119, 1989.
"Unfortunately, the lifecycle of a Wolf-Rayet star
is only a few hundred thousand years - the blink of an eye in cosmic terms," NASA explained in a (http://www.nasa.gov/image-feature/goddard/2016/hubbles-blue-bubble/) statement released last year.
In 1998 he obtained a spectrum of the Wolf-Rayet star
HD192163 in Cygnus.
The black hole's curious partner is a Wolf-Rayet star
, which also has a mass of about twenty times as much as the Sun.
The star is the hottest Wolf-Rayet star
known, with a surface temperature of 120,O00 kelvins, nearly 20 times that of the sun.
The Crescent, a 20' x 10' arc of nebulosity thrown off by a Wolf-Rayet star
, is admittedly tough, even with a filter.
The more common type of gamma-ray burst is thought to be caused when a Wolf-Rayet star
in the final phase of its evolution collapses into a black hole at its own core.