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Astronomers use novel technique to find starspots

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New method seen as powerful tool in studying stars

Newswise — COLUMBUS, Ohio – Astronomers have developed a powerful technique for identifying starspots, according to research presented this month at the 241st meeting of the American Astronomical Society.

Our sun is at times dotted with sunspots, cool dark regions on the stellar surface generated by strong magnetic fields, which suppress churning motions and impede the free escape of light. On other stars, these phenomena are called starspots, said Lyra Cao, lead author of the study and a graduate student in astronomy at The Ohio State University

“Our study is the first to precisely characterize the spottiness of stars and use it to directly test theories of stellar magnetism,” said Cao. “This technique is so precise and broadly applicable that it can become a powerful new tool in the study of stellar physics.” 

Use of the technique will soon allow Cao and her colleagues to release a catalog of starspot and magnetic field measurements for more than 700,000 stars – increasing the number of these measurements available to scientists by three orders of magnitude.

Since sunspots were first discovered in the 17th century, scientists have typically detected signatures of stellar magnetism indirectly, by looking at stars through different filters or detecting the modulation of spots in a star’s light curve. But by analyzing legacy high-resolution infrared spectra from the Sloan Digital Sky Survey, Cao was able to develop a technique for identifying starspots in 240 stars from two open star clusters, the Pleiades and M67. 

The study showed that precision starspot measurements are a powerful new class of data which could help researchers understand how stellar magnetic fields work. Due to precision of the technique, Cao was also able to see how age and rotation affected the magnetic fields on these stars. 

“It was lurking in plain sight: Within the spectrum, there was a cooler component corresponding to the starspot which was only visible in the infrared,” Cao said.

As it turns out, younger stars can be enveloped in starspots – some of them more “spot” than star, with 80% of their surfaces covered. During her studies, Cao realized that these larger cooler regions may block so much light, it might have a measurable effect on these stars. Since the light must eventually escape, she said, the star compensates by expanding and cooling enough to make more surface area available for radiation. 

Researchers also found that relying on classical methods to estimate the temperatures of these stars could be wrong by more than 100 degrees. Because scientists often rely on a star’s temperature when trying to estimate its size, astronomers could wrongly assume the radius of the star is smaller than it actually is.

“When this happens, you start seeing large changes in the stars’ structure, which can throw other important astronomical measurements off as well,” said Cao. As scientists use stellar parameters to understand our solar neighborhood and galaxy, and at times, the sizes and habitability prospects of nearby exoplanets, this method could dramatically improve researchers’ ability to test other scientific theories.

Additionally, researchers found a class of stars that are too active for standard theories to explain in the Pleiades cluster. According to Cao, these stars are not only magnetic and rife with starspots, but also overflowing with UV and X-ray radiation.

“You wouldn’t want to live around these stars,” said Cao. “But understanding why these stars are so active could change our models and criteria for exoplanetary habitability.” Further study of these unusual stars could hold the key for understanding why low mass stars are so active, the study notes.

“We can directly study the evolution of stellar magnetism in hundreds of thousands of stars with this new dataset, so we expect this will help develop key insights in our understanding of stars and planets,” said Cao.

Marc Pinsonneault, a professor of astronomy at Ohio State, co-authored the study. This work was supported by NASA.

Contact: Lyra Cao, Cao.861@osu.edu

Written by: Tatyana Woodall, Woodall.52@osu.edu

Source:  Ohio State University

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Stargazers Delight: The Perseid Meteor Shower Lights Up the Summer Sky

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Hello, stargazers and night sky enthusiasts! If you’ve been waiting for a celestial spectacle to light up the sky this year, look no further than the annual Perseid meteor shower. It’s a highlight each summer, and this year’s show has already begun, promising to offer some of the most breathtaking views yet.

dark starry sky. Perseid meteor shower
Photo by Aleksandar Pasaric on Pexels.com

What Makes the Perseids Special?

The Perseid meteor shower, active from late July to late August with a peak around mid-August, is one of the best and most reliable meteor showers of the year. Flying through the sky at a dazzling speed of 37 miles per second, the meteors streak across the night sky, decorating it with their radiant, colorful trails. These trails, or “wakes,” look like glowing lines momentarily etched into the dark canvas of space, creating a spectacle of natural fireworks.

Mark Your Calendars: Peak Viewing Times

This year, the grandest display is anticipated on the morning of August 12th. During the peak, you can expect to see between 50 to 100 meteors per hour. For the best viewing experience, find a spot away from city lights, and look up between midnight and dawn. This timing, when the skies are darkest, promises a clearer view and a greater number of meteors. Don’t worry if you can’t make it on the peak night; the Perseids are known for a strong buildup and you can start watching for meteors as early as the first week of August.

Why They Shine So Brightly

The science behind the spectacle is as fascinating as the visuals. Meteors, often referred to as “shooting stars,” are actually bits of comet debris entering Earth’s atmosphere at extremely high speeds. The Perseids originate from the comet 109P/Swift-Tuttle, which orbits the Sun every 133 years, shedding particles along its path. These particles then collide with Earth’s atmosphere, heating up due to the immense friction, and igniting the fiery trails we see from the ground.

Interestingly, the Perseids are particularly known for their fireballs: larger and more vivid meteors that produce an exceptionally bright and long-lasting display. This makes the Perseids one of the most spectacular meteor showers to observe.

Look to Perseus

The shower is named “Perseids” because the meteors seem to emerge from the constellation Perseus, helping observers know where to direct their gaze. Gather your friends, set up a cozy spot under the stars, and prepare to be mesmerized by these celestial fireworks.

Tips for Meteor Watchers

To maximize your Perseid experience, consider the following tips:

  • Find a dark spot, away from the light pollution of urban areas.
  • Bring a reclining chair or a blanket so you can lie back comfortably and look up.
  • Allow your eyes about 15-30 minutes to adapt to the darkness for optimal viewing.
  • No special equipment is needed, just your eyes, but a pair of binoculars might bring an enhanced view of the sky.
  • Check the weather: clear, cloudless skies are best for meteor watching.

The Perseid meteor shower is not just a beautiful natural phenomenon but also a shared celestial event that unites sky watchers around the globe in wonder and excitement. So mark your calendars, and get ready to enjoy one of nature’s most dazzling shows. Whether you’re a novice watcher or a seasoned astronomer, the Perseids are sure to offer a memorable sky gazing experience. Happy meteor hunting!

If you want to learn more about the upcoming meteor showers, check out the link. https://earthsky.org/astronomy-essentials/earthskys-meteor-shower-guide/

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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  • Rod Washington

    Rod: A creative force, blending words, images, and flavors. Blogger, writer, filmmaker, and photographer. Cooking enthusiast with a sci-fi vision. Passionate about his upcoming series and dedicated to TNC Network. Partnered with Rebecca Washington for a shared journey of love and art.

    View all posts
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Celestial Wonders: The Return of Comet 13P/Olbers

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Stargazers and astronomy enthusiasts, mark your calendars! After a 68-year voyage through the vast reaches of our solar system, Comet 13P/Olbers is making a grand return, bringing with it a spectacular opportunity for celestial observations. On July 20, 2024, this fascinating cosmic traveler will be at its closest point to Earth, offering a unique glimpse into the dynamic and ever-changing universe we live in.

Comet 13P/Olbers
Comet Olbers on 24 June 2024. ImageCredit: By C messier

A Brief History of Comet 13P/Olbers

Discovered on March 6, 1815, by the German astronomer Heinrich Olbers, the comet that now bears his name has intrigued astronomers for over two centuries. Olbers, observing from Bremen, noticed the comet when it was faintly visible to the naked eye. Since its discovery, this periodic comet – named so due to its regular returns to the inner solar system – completes an orbit around the sun every 68 years.

The Spectacular 2024 Close Approach

This year, Comet 13P/Olbers made its perihelion (closest approach to the sun) on June 30 and is now racing towards its closest approach to Earth. On the evening of July 20, it will be about 176 million miles (283.5 million km) from our planet. Despite this considerable distance, Comet 13P/Olbers is currently the brightest comet gracing our skies, primarily found in the constellation of Ursa Major but swiftly moving toward Leo Minor in the northwestern sky.

man with telescope watching sky
Photo by Pavel Danilyuk on Pexels.com

How to Observe Comet 13P/Olbers

For those eager to catch a glimpse of this celestial wanderer, the current week offers the prime viewing window. Although the comet’s brightness is pegged at a magnitude of 6.5 to 7 – typically below the threshold of visibility to the naked eye – it should be readily observable through binoculars or a small telescope.

Observers in the Northern Hemisphere are particularly in luck, as they’ll have the best chance of spotting the comet. If you’re near the equator, try your luck by searching low on the horizon just after sunset, especially around July 16 when Comet 13P/Olbers will pass close to the irregular galaxy NGC 3104 in Leo Minor. This close passage not only provides a treat for the eyes but also a golden opportunity for astrophotographers looking to capture both the comet and galaxy in one frame.

A Celestial Event Not to Miss

Considering the next return of Comet 13P/Olbers is slated for March 2094, this year’s close approach serves as a rare and significant event for both amateur and professional astronomers. The comet’s journey through the cosmos is a reminder of the relentless and beautiful dynamism of our universe.

So whether you’re a seasoned astronomer with sophisticated equipment or an amateur stargazer with a simple pair of binoculars, make sure to step outside and take advantage of this cosmic spectacle. Observing and appreciating heavenly events like the return of Comet 13P/Olbers not only enrich our understanding of the universe but also add to the collective wonder and mystery of our starry skies.

Don’t miss the chance to observe Comet 13P/Olbers as it makes its closest approach to Earth on July 20, 2024. It’s a fleeting visit, and one not to be repeated for another 70 years. Grab your telescopes and binoculars, and look up to the stars, for there lies a wanderer from the depths of space, momentarily close enough to whisper the secrets of the cosmos.

Check out the article posted on EarthSky.com, they have sky maps so that you can find and track the comet. https://earthsky.org/space/comet-13p-olbers-finder-maps/

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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The Perseid Meteor Shower Begins Today: When To See It At Its Best

Don’t miss the dazzling Perseid meteor shower starting today! Ideal conditions await for a mesmerizing celestial show under the night sky.

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The much-anticipated Perseid meteor shower is set to dazzle viewers starting today, providing a celestial spectacle that is not to be missed. With ideal conditions aligning, including a 43%-lit waxing crescent moon sinking into the southwestern horizon just before midnight in the northern hemisphere, skygazers are in for a treat as they witness this breathtaking display.

falling stars in the night sky. Perseid Meteor Shower
Photo by ARMAN ALCORDO JR. on Pexels.com

For those looking to catch the Perseids at their peak, experts recommend planning ahead by booking Monday and Tuesday off and embarking on a camping trip to a dark sky location. This will allow for uninterrupted viewing of the meteor shower between 11:00 PM and dawn, promising a memorable experience under the stars.

Perseid Meteor Shower

One burning question on many minds is just how many “shooting stars” can be expected during the Perseids. While some sources suggest numbers as high as 150 per hour, a more realistic estimate hovers around 50 meteors per hour. Regardless, witnessing even a fraction of these celestial wonders is sure to leave a lasting impression.

The origins of the Perseid meteor shower trace back to comet 109P/Swift-Tuttle, a celestial body that orbits the sun every 133 years. Debris left by this comet in the inner solar system is responsible for the dazzling display seen during the Perseids, with meteors streaking through the sky at an astonishing 37 miles per second.

To maximize your chances of enjoying the Perseids to the fullest, NASA offers some valuable tips for viewing meteor showers. These include escaping urban light pollution, finding a dark, unobstructed viewing spot, dressing warmly, and exercising patience while scanning the sky for at least half an hour. Remember to refrain from using telescopes or binoculars, as they can hinder your ability to see meteors clearly.

As you prepare to witness the magic of the Perseid meteor shower, keep in mind that minimizing distractions such as cellphone use and white light sources will enhance your viewing experience. Embrace the beauty of the night sky, and allow yourself to be captivated by nature’s own fireworks display.

So, set your sights skyward, find a cozy spot under the stars, and prepare to be amazed by the wonder of the Perseids. Happy stargazing!

https://earthsky.org/astronomy-essentials/earthskys-meteor-shower-guide/

The science section of our news blog STM Daily News provides readers with captivating and up-to-date information on the latest scientific discoveries, breakthroughs, and innovations across various fields. We offer engaging and accessible content, ensuring that readers with different levels of scientific knowledge can stay informed. Whether it’s exploring advancements in medicine, astronomy, technology, or environmental sciences, our science section strives to shed light on the intriguing world of scientific exploration and its profound impact on our daily lives. From thought-provoking articles to informative interviews with experts in the field, STM Daily News Science offers a harmonious blend of factual reporting, analysis, and exploration, making it a go-to source for science enthusiasts and curious minds alike. https://stmdailynews.com/category/science/

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  • Rod Washington

    Rod: A creative force, blending words, images, and flavors. Blogger, writer, filmmaker, and photographer. Cooking enthusiast with a sci-fi vision. Passionate about his upcoming series and dedicated to TNC Network. Partnered with Rebecca Washington for a shared journey of love and art.

    View all posts

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