Astronomers capture most distant star ever seen
Washington: American astronomers have captured the most distant normal star ever observed, some 9 billion light years from Earth, thanks to a rare cosmic alignment.
The study, published on Monday online in the journal Nature Astronomy, revealed the discovery of a star called Icarus, magnified by gravitational lensing by over 2,000 times, reported Xinhua.
Astronomers routinely study galaxies much farther away, visible because they glow with the brightness of billions of stars. They also managed to study supernova, often brighter than the galaxy in which it sits.
However, for a distance of about 100 million light years, the stars in these galaxies are impossible to make out individually.
But a phenomenon called gravitational lensing, the bending of light by massive galaxy clusters in the line of sight, can magnify the distant universe and make dim, far away objects visible.
The single star was discovered in NASA Hubble Space Telescope images taken in late April of 2016 and as recently as April 2017.
"You can see individual galaxies out there, but this star is at least 100 times farther away than the next individual star we can study, except for supernova explosions," said Patrick Kelly at the University of Minnesota, Twin Cities, the paper's first author.
These observations can provide a rare look at how stars evolve, especially the most luminous ones.
"For the first time ever we're seeing an individual normal star - not a supernova, not a gamma ray burst, but a single stable star - at a distance of nine billion light years," said Alex Filippenko, a professor of astronomy at UC Berkeley and one of many co-authors of the report.
The B-type star Icarus is much larger, more massive, hotter and possibly hundreds of thousands of times intrinsically brighter than our Sun.
According to the researchers, an extended lens, like a galaxy cluster, can only magnify a background object up to 50 times, but smaller objects can magnify much more.
A single star in a foreground lens, if precisely aligned with a background star, can magnify the background star thousands of times.
In this case, a star about the size of our sun briefly passed directly through the line of sight between the distant star Icarus and Hubble, boosting its brightness significantly.
Also, if the alignment was perfect, that single star within the cluster turned the light from the distant star into an "Einstein ring": a halo of light created when light from the distant star bends around all sides of the lensing star.
The ring is too small to discern from this distance, but the effect made the star easily visible by magnifying its apparent brightness.
The astronomers predict that Icarus will be magnified many times over the next decade as cluster stars move around, perhaps increasing its brightness as much as 10,000 times.
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Chhattisgarh Vedanta power plant blast: Death toll rises to 20; sixteen workers undergoing treatment
Sakti (Chhattisgarh) (PTI): The death toll in a blast at the Vedanta power plant in Chhattisgarh's Sakti district has mounted to 20 with seven more workers succumbing to injuries, while 16 others are undergoing treatment at different hospitals, officials said on Wednesday.
The deceased include six labourers from West Bengal, five from Chhattisgarh, three each from Jharkhand and Uttar Pradesh, two from Bihar, and one from Madhya Pradesh.
The opposition Congress has demanded registration of an FIR against the plant management and a judicial inquiry into the incident.
The explosion occurred on Tuesday afternoon in a steel tube carrying high-pressure steam from the boiler to the turbine at the Vedanta Ltd power plant located in Singhitarai village, leaving several workers with severe burn injuries.
According to officials, four workers died on the spot, while nine others succumbed to injuries soon after the incident.
Seven more workers have died in hospitals, raising the toll to 20, Sakti Collector Amrit Vikas Topno told PTI on Wednesday.
He said that a total of 36 workers were affected in the blast, and 20 of them died.
"Of the 16 injured workers, five are undergoing treatment in hospitals in Raipur, while 11 others are in hospitals of Raigarh, the neighbouring district of Sakti," he added.
Topno added that every possible effort was being made to provide the best medical treatment to the injured.
The deceased were identified, and their family members are being contacted. Arrangements have been made to transport the mortal remains to their native villages via ambulance following the postmortem examination and to provide immediate financial assistance, he said.
Chief Minister Vishnu Deo Sai has announced a compensation of Rs 5 lakh to the families of each deceased worker and Rs 50,000 for those injured.
Vedanta Power has also announced a Rs 35 lakh compensation for the family of each deceased worker, along with employment support.
The company will also provide Rs 15 lakh to each injured person, ensure salary continuation until recovery, and offer counselling support, a statement from the plant management said.
The chief minister has ordered an inquiry by the Commissioner of the Bilaspur division, assuring strict action against the guilty.
He directed officials to ensure free and proper medical treatment for all injured and emphasised that no negligence in their care would be tolerated.
The district administration has also ordered a separate magisterial probe, while the company has initiated its own internal investigation.
Collector Topno has appointed the Sub-Divisional Magistrate (SDM) of Dabhra to conduct the magisterial inquiry.
The SDM has been asked to submit a report within 30 days covering key aspects, including the cause of the accident, whether it was due to technical or human error, and details of safety inspections carried out at the plant.
Meanwhile, the opposition Congress has demanded registration of an FIR against the plant management and a judicial inquiry into the incident.
State Congress communication wing head Sushil Anand Shukla on Wednesday alleged negligence on the plant management's part and accused the government of attempting to shield those responsible.
He also demanded compensation of Rs 1 crore for the families of the deceased and Rs 50 lakh for the injured.
The construction of a 1,200 MW coal-based thermal power project (two units of 600 MW each) in Singhitarai, originally owned by Athena Chhattisgarh Power Ltd, started in 2009, but remained stalled between 2016 and 2022.
Vedanta acquired the plant in 2022, after which a 600 MW unit was completed and commissioned in August last year, while the second unit is still under construction.
The deceased have been identified as Amrit Lal Patel, Thanda Ram Lahre, Udhab Singh Yadav, Rameshwar Mahilange, and Nadeem Ansari (all from Chhattisgarh); Susanta Jana, Sheikh Saifuddin, Manas Giri, Kailash Mahto, Shibnath Murmu, and Dipankar Singh (West Bengal), Tarun Kumar Ojha, Abdul Karim and Ashok Parhiya (Jharkhand), Raju Ram, Pappu Kumar and Brijesh Kumar (Uttar Pradesh), Aakib Khan and Ritesh Kumar (Bihar), and Chitranjan Dhulai of Madhya Pradesh, officials said.
