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Normal Stars & Star Clusters
X-ray Astronomy Field Guide
Normal Stars & Star Clusters
Questions and Answers
Normal Stars & Star Clusters
Chandra Images
Normal Stars & Star Clusters
Animations & Video: Normal Stars & Star Clusters
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1. Tour of Eta Carinae
QuicktimeMPEG The Eta Carinae star system does not lack for superlatives. First, it contains one of the biggest and brightest stars in our galaxy, weighing at least 90 times the mass of the Sun. It is also extremely volatile and astronomers expect it will have at least one supernova explosion in the future. As one of the first objects observed by NASA's Chandra X-ray Observatory after its launch some 15 years ago, this double star system continues to reveal new clues about its nature through the X-rays it generates. New Chandra data are helping astronomers better understand how the two stars in Eta Carinae interact with one another through powerful winds blowing off their surfaces. As the two stars travel around each other in their elliptical orbits, the amount of X-rays detected changes. This gives astronomers clues to what is happening between these stars now and what may happen to this system in the future.
[Runtime: 01:15]
(NASA/CXC/April Jubett)

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2. Tour of Flame Nebula
QuicktimeMPEG Astronomers have made an important advance in the understanding of how clusters of stars like our Sun form using data from NASA's Chandra X-ray Observatory and infrared telescopes. The data show early notions of how star clusters are formed cannot be correct. The simplest idea is stars form into clusters when a giant cloud of gas and dust condenses. The center of the cloud pulls in material from its surroundings until it becomes dense enough to trigger star formation. This process occurs in the center of the cloud first, implying that the stars in the middle of the cluster form first and, therefore, are the oldest. These new results suggest something else is happening. By studying two clusters where Sun-like stars are forming - NGC 2024 (located in the center of the "Flame Nebula") and the Orion Nebula Cluster - researchers have discovered the stars on the outskirts of the clusters are actually the oldest. The researchers will use this same technique of combining X-rays and infrared data to study the age range in other clusters. In the meantime, scientists will be hard at work to develop other, more complex ideas to explain what they've seen in NGC 2024 and the Orion Nebula Cluster.
[Runtime: 01:32]
(NASA/CXC/A. Hobart)

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3. A Field Trip to Star School
QuicktimeMPEG If you wanted to learn about young people, you would probably visit a school where there are lots of young people, right? This photograph shows a star "school" - home to over a thousand of the biggest and brightest young stars in the sky. When astronomers want to study young stars, this cluster - called Cygnus OB2 - is one of the first places they look.

Cygnus OB2 is the largest star cluster in the northern half of the sky, containing about 30,000 times as much material as the Sun! This cluster also happens to be one of the closest to Earth. So why didn't you hear about this before? Well, it is almost completely hidden behind a massive dust cloud. To study it, astronomers have to use telescopes that can "see" in X-ray and infrared light. These types of light can go through the thick dust that is impenetrable for visible light.

One of the most interesting - but unfortunate! - discoveries that astronomers made while studying the massive, young stars in this cluster, is that most of them will host fewer planets than their brothers and sisters in less massive clusters. Some might not host planets at all!

When a star forms, there is always some material left over. This becomes a disc of dust and dirt, like a thicker version of Saturn's rings. Within this disc, small dust grains made of rock and ice can form, and these sometimes merge together into larger and larger objects - imagine rolling a snowball around in the snow: it becomes bigger and bigger as it collects snow. This is how planets are born.

Massive, young stars however, can destroy the dusty discs of their lower-mass neighbors with their intense energy spatting out, long before any planets might be born!
[Runtime: 02:20]
(NASA/CXC/April Jubett)

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4. Tour of DEM L241
QuicktimeMPEG When a massive star runs out fuel, it collapses and explodes as a supernova. Although these explosions are extremely powerful, it is possible for a nearby star to endure the blast. A team of astronomers using NASA's Chandra X-ray Observatory and other telescopes has found evidence for one of these survivors. This hardy star is in a stellar explosion's debris field - also called its supernova remnant - located in an HII region called DEM L241. An HII (pronounced "H-two") region is created when the radiation from hot, young stars strips away the electrons from neutral hydrogen atoms to form clouds of ionized hydrogen. This particular HII region is located in the Large Magellanic Cloud, a small neighboring galaxy to the Milky Way. The supernova remnant remains hot for thousands of years after the original explosion occurred, and this means that it continues to glow brightly in X-rays that can be detected by Chandra. The data suggest that a point-like source in X-rays is one component of a binary star system. In such a celestial pair, either a neutron star or black hole, which is formed when the star went supernova, is in orbit with a star much larger than our Sun. As they orbit one another, the dense neutron star or black hole pulls material away its companion star through the wind of particles that flows away from its surface. If this result is confirmed, DEM L241 would be only the third binary containing both a massive star and a neutron star or black hole ever found in the aftermath of a supernova.
[Runtime: 01:59]
(NASA/CXC/A. Hobart)

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5. Super-Sized Space Spider!
QuicktimeMPEG Don't worry if you have a phobia of spiders, it is safe to keep watching! That's because this wonderful picture of a star-forming region called the Tarantula Nebula doesn't show the bright lines of gas that usually make it look like it has the legs of a spider.

Instead, this picture gives us an unusual view of the Tarantula Nebula. Astronomers had to combine observations made with two space telescopes to create this photo. It shows the X-ray radiation given off by very hot gas (the blue parts, captured by the Chandra X-ray Observatory) and the cooler gas that surrounds it (the orange parts, taken by the Spitzer Space Telescope).

The Tarantula Nebula is already big - it would take light about 650 years to cross from one end to the other - but it's getting even bigger! Astronomers have two ideas about what is causing the Tarantula's growth: Some astronomers think that explosions of the hot gas (shown in blue) are making it bigger, while others think that radiation from massive stars is causing the gas in the nebula to expand. To find out what is going on once and for all, astronomers need to take another look at this region.

When astronomers observe the Tarantula Nebula again, they won't be looking to prove their own ideas right. All they can do is look at what their observations tell them - even if it means acknowledging that they had been wrong.
[Runtime: 01:55]
(NASA/CXC/April Jubett)

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6. Beautiful But Deadly
QuicktimeMPEG It seems that there is a twist in nature: the more beautiful something is, the more deadly it also might be. For example, some of the most colorful animals, insects and flowers can also be among the most poisonous. Is that also true in space? This new space image shows a pink bubble of gas glowing against a shining field of stars. Well, this pretty cloud is another of nature's dangerous beauties - it's shooting out huge amounts of intense, deadly radiation! Fortunately, we humans are safe from it however.

The glowing cloud of gas and dust in this picture is called a 'Super-bubble'. They are found in areas where lots of massive stars have formed fairly recently. These baby stars blow out intense winds and massive stars 'live fast and die young'. They speed through their lives to explode as powerful supernovas. It's these destructive events that have carved-out the center of the cloud, leaving behind just a ring of gas and dust.

The chaos taking place inside these giant super-bubbles stretches far beyond the hollowed cloud in the form of potentially dangerous X-ray radiation. Scientists have discovered that this particular cloud gives off 20 times more of these intense rays than they expected! So, here's another example of something that's beautiful but might be deadly! Our advice is: always enjoy beautiful things from a safe distance!
[Runtime: 02:02]
(NASA/CXC/April Jubett)

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7. Goodness Gracious, Great Ball of Fire!
QuicktimeMPEG

Imagine you're in a spaceship, looking for a new world to settle down in. You see a planet in the distance and it's a beautiful blue color, just like Earth when it's seen from space. This planet is called HD 189733, and it is the first planet outside of our own Solar System that we've worked out the color of! But while it might look like Earth from a distance, if you flew closer to it, you'd realize just how different it is from our home.

HD 189733 is an enormous gas giant, over 100 times bigger than Earth. It orbits very close to its star. It takes Earth 365 days to orbit our Sun once, but it only takes this planet 2.2 days! In fact, it's so close to its star that temperatures in its atmosphere reach over 1000°C! No amount of sun lotion or ice cream would make this a nice place to visit.

As of today, 925 planets have been discovered orbiting around other stars in our Galaxy. But they're very small and dim, so it's not very often that we can actually see the planets. Most of the time we have to detect them using nifty tricks instead. One method is called the 'Transit Method'. We point our telescope at a star, and wait to see if it gets any dimmer. If the star does get dimmer, it means that a planet is passing in front of it and blocking some of the light. With HD 189733, astronomers have looked at the system using the Chandra X-ray Telescope to find the dip in the amount of X-rays when the planet passes in front of the star.

By doing this, they've managed to reveal some scary new details. The planet has an enormous atmosphere, which you can see in this drawing. But the boiling heat of its parent star is roasting away huge amounts of the planet's air - up to 600 million kilograms every second!


[Runtime: 02:04]
(NASA/CXC/April Jubett)

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8. Tour of HD 189733
QuicktimeMPEG HD 189733b: An exoplanet in orbit around a star about 63 light years from Earth.It has been nearly two decades since the first exoplanets - that is, planets around stars other than our Sun - were discovered. Now for the first time, X-ray observations have detected an exoplanet passing in front of its parent star. The observations, made by NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton Observatory, took advantage of the alignment of a planet and its parent star in HD 189733. This alignment enabled the observatories to observe a dip in X-ray intensity as the planet moved in front of, or transited, the star. This technique is the one used so successfully at optical wavelengths by NASA's Kepler telescope. In earlier studies using optical light, astronomers discovered that the main star in the HD 189733 system had what is known as a "hot Jupiter" around it. This means the planet is about the size of Jupiter, but in very close orbit around its star. The planet - that has been named HD 189733b -- is over 30 times closer to its star than Earth is to the Sun, and goes around the star once every 2.2 days. The new X-ray data suggest that this planet has a larger atmosphere than previously thought. This, in turn, may imply that radiation from the parent star is evaporating the atmosphere of HD 189733b more quickly than expected. The results on HD 189733 demonstrate how we need information from many different telescopes that detect different types of light to get a fuller picture of these mysterious worlds that we are now able to explore.
[Runtime: 01:54]
(NASA/CXC/J. DePasquale)

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9. Tour of NGC 602
QuicktimeMPEG The Small Magellanic Cloud - also known as the SMC - is one of the closest galaxies to the Milky Way. Because the SMC is so close and bright, it offers a chance to study phenomena that are difficult to examine in more distant galaxies. Chandra has been used to make the first detection of X-ray emission from young, low-mass stars outside our Milky Way galaxy. By "low-mass" we mean with masses similar to our Sun. The Chandra observations of these low-mass stars were made of the region known as the "Wing" of the SMC. In this composite image of the Wing the Chandra data is shown in purple, optical data from the Hubble Space Telescope is shown in red, green and blue and infrared data from the Spitzer Space Telescope is shown in red. The Wing differs from most areas in the Milky Way by having relatively few metals, that is elements heavier than hydrogen and helium. The Chandra results imply that the young, metal-poor stars in NGC 602a make X-rays just like stars with much higher metal content in our galaxy make X-rays.
[Runtime: 01:22]
(NASA/CXC/A. Hobart)

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10. Learn About Stars
QuicktimeMPEG Stars appear to be permanent fixtures of the night sky. However, stars are like people. They are born, live a lifetime, and ultimately die.
Chandra and other X-ray telescopes focus on the high-energy action of stellar drama....
...sudden outbursts on the turbulent surfaces of stars,
...gale-force outflows of gas from hot, luminous stars,
...and awesome shock waves generated by supernova explosions.
See stellar evolution through Chandra's eyes.
[Runtime: 1.31]
(NASA/CXC/A. Hobart)

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