Does A Massive Star Has Disappeared Without any Trace !


ESO/L. Calçada
Credit:ESO/L. Calçada

An unusually bright massive star has gone missing, in a mystery of cosmic universe.

According to new research published in Monthly Notices of the Royal Astronomical Society.

It was located in the constellation Aquarius, about 75 million light year away in the Kinman-GNOME Galaxy.

The giant bright blue star was hypothesized to exist based on astronomical observations made between 2001 and 2011. But now (as of 2019), it is no longer detectable.

Scientist are wondering if a distant object collapsed to create a black hole without a supernova explosion.

If this is correct, this would be the first example of how such a large stellar object ends its life in this way.

The giant star is known or related to the bright blue variable, It is about 2.5 million times faster than the Sun.

These types of stars are unstable, showing random dramatic shifts in their spectra – the amount of light emitted at different wavelengths – and brightness.

Between 2001 and 2011, various groups of astronomers studied the star on a large scale. Concluding that it was in the final stages of development.

The Kinman-GNOME galaxy is too far away for astronomers to see their individual stars, but they can detect the signatures of some of them.

Astronomers used a very large telescope in Chile.

In 2019, a team led by Andrew Allen, a graduate student at Trinity College Dublin, Ireland, set his sights on the galaxy to learn about how massive stars ended their lives.

But when they sent it to the Very Southern Telescope (ESL) of the European Southern Observatory (VLT), they could no longer detect the star’s control signatures.

Mr. Allen says “We were very surprised to learn that Tara had disappeared!”

He commented: “It would be very unusual for such a massive star to disappear without a supernova explosion.”

Older observations suggest that the star has experienced a massive explosion in which material is lost by the star. It is believed that they closed after 2011.

Such bright blue variable stars have been prone to such outbreaks throughout their lives. They lose mass to the stars and lead them to a dramatic peak in brightness.

Based on their observations and models, astronomers provide two explanations for the disappearance of a star and the absence of supernovae.

The glow has changed the bright blue variable into a less bright star, which may be partially obscured by dust.

Alternatively, the team says that the supernova explosion could cause the star to fall into a black hole.

Which would be a rare event. Our current understanding of how massive stars die suggests that most of them are meeting their end in a turbulent new one.

If the explanation for the black hole is correct, 
Mr. Allen said, “it would be the first direct detection of such a star that is ending its life in this way.”

Trinity College Dublin co-author Jose Gro commented “We may have discovered one of the biggest stars in the local universe, slowly leaving for the night.”

Future research is needed to confirm what happened to the star.

Extremely large Esco telescopes (ELTs), which is due to begin in 2025, will be able to resolve stars in distant skies such as the dwarf galaxy, in a way that will help shed more light on the space puzzle.

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