The article reports, "The star, known as LP 40-365, currently lies about 2,000 light-years from Earth. And calling it a star may be a bit generous, actually; Hermes and his colleagues think it's a hunk of a superdense stellar corpse called a white dwarf that was blown apart in a violent supernova explosion after gobbling up too much mass from a companion."
Fast stars like this are reported in past publications too. Speedy white dwarf may have survived a rare type of supernova,
https://www.newscientist.com/articl...f-may-have-survived-a-rare-type-of-supernova/, August 2017.
Fastest stars in the Milky Way are 'runaways' from another galaxy,
https://phys.org/news/2017-07-fastest-stars-milky-runaways-galaxy.html, July 2017.
Supergiant Star Caught Fleeing In Another Galaxy,
http://www.skyandtelescope.com/astronomy-news/supergiant-star-caught-fleeing-through-another-galaxy/, April 2018. ""Astronomers recently spotted a rare kind of runaway star speeding through the Milky Way’s neighboring galaxy, the Small Magellanic Cloud. While only a few dozen runaway stars are known, this particular find suggests that these objects might be common in the universe. Massey and lead author Kathryn Neugent (University of Washington and Lowell Observatory) first found the star nine years ago while doing a survey of yellow supergiants in the Large and Small Magellanic Clouds, satellite galaxies of the Milky Way. The new study presents additional observations, which confirm that this star is really moving so quickly through its galaxy and isn’t just orbiting another star at high speed. What makes the new sighting unique is not only the star’s high speed – 134 km/s (300,000 mph) – but also its advanced phase of evolution. The star, called J01020100-7122208, is a yellow supergiant like Polaris."
Indeed, there appears to be a history of observing and recording some very fast stars or objects moving along faster than I can run
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