ALMA captures highest-resolution image of evolved star in final stages of evolution
The Atacama Large Millimeter/submillimeter Array (ALMA) has recently shared its highest-resolution image to date, featuring a star in the final stages of its evolution. The ground-based telescope array, located in the Atacama Desert of northern Chile, captured an up-close view of an evolved star called R Leporis, located 1,350 light-years from Earth within our own Milky Way galaxy.
The remarkable image, taken using ALMA’s highest frequency Band 10 receiver and an array configuration that spans 10 miles, showcases both emissions from the stellar surface in orange and a bright ring-like gas structure surrounding the star in blue.
In order to capture this unprecedented view, researchers developed a new calibration technique called the band-to-band method. This strategy compensates for atmospheric fluctuations by observing a nearby calibrator in low-frequency radio waves, while the target is observed with high-frequency radio waves. This innovative method significantly enhances ALMA’s high-frequency capabilities, enabling the telescope to observe objects at an angular resolution of 5 milli-arcseconds.
“The success of the Band 10 high-resolution observation showcases our commitment to innovation and reinforces ALMA’s position as a leader in astronomical discovery. We are excited about the new possibilities for the scientific community,” said lead author Yoshiharu Asaki.
The findings, which were published in The Astrophysical Journal on Nov. 15, mark a significant milestone in our quest to understand the universe and open up new possibilities for the scientific community. The high-resolution image has provided astronomers with a closer look at the final stages of star evolution, shedding light on phenomena that were once beyond our reach.