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Astronomers from the International Gemini Observatory released on May 22 the most detailed image ever made of NGC 1514, named the Crystal Ball Nebula, a planetary nebula 1,500 light-years from Earth in the constellation Taurus, sculpted by a binary pair of stars dancing around each other in 9-year cycles at the heart of a dying star.
The responsible telescope is the Gemini North, with an 8.1-meter primary mirror.
It is located atop Maunakea, a 4,205-meter high mountain in Hawaii.
It has been observing the sky for more than two decades and is one of the largest optical telescopes in the northern hemisphere.
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The light captured for the photo left the nebula 1,500 years ago.
To anchor this distance in human time, it was around the year 526 AD.
It was the era when Charlemagne founded the Holy Roman Empire and Europe entered the early Middle Ages.
The NGC 1514 nebula is located in the direction of the constellation Taurus, near the border with Perseus.
It was discovered on November 13, 1790, by the German-British astronomer William Herschel.
Herschel looked through his homemade telescope in Slough, England, and saw only a small luminous spot.
He couldn’t imagine the internal structure of this celestial speck.
We spent more than 200 years without understanding the exact shape of this piece of sky.
The slowest binary dance ever cataloged
The center of the Crystal Ball Nebula hides a system of two stars.
One is an O-type star, sub-luminous, with a very high surface temperature.
The other is a giant A0III that provides most of the energy that illuminates the nebula.
The two orbit each other every 9 years.
It is the slowest binary cycle ever recorded within a planetary nebula.
For comparison, most binary systems in nebulae have periods of hours, days, at most weeks.
Nine years per complete orbit places NGC 1514 in a category apart from what was known so far about stellar dynamics within these gas clouds.
It’s the way the two stars dance that shapes the irregular form of the nebula.
Each blows asymmetric stellar winds, compressing the expelled gas into successive layers that look like luminous cotton flakes floating in space.
How a star dies
The Crystal Ball is a classic example of a planetary nebula.
Despite the confusing name, it has nothing to do with planets.
The category was named in the 18th century because the nebulae appeared, seen in small telescopes, like planetary disks.
In fact, a planetary nebula forms when an intermediate-mass star ejects its outer layers at the end of its life.
The star’s core remains as a white dwarf, still hot enough to ionize the expelled gas and make the nebula glow from the inside out.
It’s as if the star sheds its own skin in concentric layers before dying definitively.
The process lasts between 10,000 and 20,000 years, a short interval on the stellar scale.
Afterwards, the gas dissipates into interstellar space and enriches clouds where new stars will form.
Webb completes the portrait
The James Webb, which also captured for the first time water ice clouds on an exoplanet this month, made infrared observations of the Crystal Ball.
Webb’s images reveal two dust rings around the nebula, invisible in visible light.
Astronomers believe the rings came from a previous mass loss episode of the binary pair.
They were later shaped by the fast and asymmetric winds of the two stars.
By combining what Gemini North captured in visible light with what Webb showed in infrared, researchers can now reconstruct the complete history of how the central star began to die.
I confess that this part fascinates me the most: each planetary nebula is a short chapter in the galaxy’s life, and we are seeing it happen in real-time, centuries after the gas has left.
The Crystal Ball will continue inflating for the next millennia.
Then it will dilute, and at some point in a few tens of thousands of years, this specific piece of the sky will go dark again.
And you, which other recent astronomical discovery catches your attention the most for the patience of scientific observation? Share it with us.
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