After believing since the 1980s that such a star should be theoretically possible, a group of astronomers has published their discovery of a bizarre star that pulses on just one side.
Every star changes size over the course of its life. Some swell up as they get old, others pulsate on a regular basis – but what about a star that pulses on just one side? Well, astronomers at Australia’s Sydney Institute for Astronomy at the University of Sydney have published a new study showing that this kind of star exists, too.
An artist’s impression of pulsating star HD74423 with its tidally locked red dwarf companion.
The reason for the star’s teardrop shape is that it’s half of a binary star system. Its companion star, a tiny red dwarf, orbits close and fast, pulling on its larger partner, distorting the bigger star’s shape so that it bulges on one side.
HD74423 is about 1,500 light-years from Earth and 1.7 times the size of our sun.
“I’ve been looking for a star like this for nearly 40 years, and now we have finally found one,” said co-author Don Kurtz, a scholar at the University of Sydney visiting from the UK’s University of Central Lancashire.
The researchers noted they expect to “find many more hidden in the TESS data,” now that they know such a star exists and how to find it. The paper discussing their findings was published Tuesday in the journal Nature Astronomy.
Sourse: sputniknews.com
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