NASA’s Chandra traces mysterious star outbursts to orbiting black hole or neutron star
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Chandra X-ray data show a hidden companion, likely a stellar-mass black hole or neutron star, strips material from the luminous blue variable AT 2016blu every 113 days in galaxy NGC 4559, about 30 million light-years from Earth. The star weighs at least 33 solar masses; a study published Monday in The Astrophysical Journal reports the first X-ray detection of this erupting star class with such a partner.
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