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Stars & Clusters


Stars & Clusters

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Globular Cluster M22. It contains over 100,000 stars that formed together and remain gravitationally bound. The cluster orbits the center of the Milky Way. Globular clusters are very old, close to the age of the Universe. (Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT) Mona Evans, “Sagittarius the Archer” www.bellaonline.c...

APOD: 2005 June 27 - Globular Cluster M22 from CFHT

apod.nasa.gov

Light curve of binary star Kepler-16. (Image: NASA) This an example of a a type of variable star known as an eclipsing variable. Algol is the classic example of such a star, but Lambda Tauri is also seen nearly edge on like this. Lambda Tauri is a triple system and a third star orbits the binary. Mona Evans, "Taurus the Bull" www.bellaonline.c...

File:Light curve of binary star Kepler-16.jpg - Wikimedia Commons

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M44: The Beehive Cluster (Image Credit & Copyright: Bob Franke)

APOD: 2014 February 22 - M44: The Beehive Cluster

apod.nasa.gov

Comparing the sizes of the planets, then comparing bigger and bigger and yet bigger stars. Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

List of largest known stars - Wikipedia, the free encyclopedia

en.wikipedia.org

Hypergiant Size comparison between the Sun and VY Canis Majoris, a hypergiant which is one of the largest known stars. Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

Hypergiant - Wikipedia, the free encyclopedia

en.wikipedia.org

A STAR'S BIRTH AND DEATH

A group of baby stars form a "stellar snowflake" in Spitzer observations of a dusty region near the Cone Nebula. [Still from JPL/Cal Tech Gallery Explorer video]. Especially noticeable is the star that has a number of stars seemingly radiating from it. The radial structure is reminiscent of a snowflake.

In a classical nova, a white dwarf siphons material off a companion star, piling up material on its surface until thermonuclear processes kick off, creating a brilliant outburst. (Credit: NASA / JPL-Caltech)

Novae Surprise with Gamma Rays - Sky & Telescope

skyandtelescope.com

Pistol Star. One of the brightest star s known. (Credit: D. F. Figer (UCLA) et al., NICMOS, HST, NASA) It's so far away & so obscured by dust, it took the Hubble Space Telescope to confirm it existed. It lies at the center of the Pistol Nebula and seems to be throwing off the mass that created the nebula. It emits 10 million times more light than Sun. Mona Evans, "How Big Are the Biggest Stars" www.bellaonline.c...

Arcturus – Sun comparison. (Illustration – Bob King) The Sun looks very small compared to red giant Arcturus. Mona Evans, "How Big Are the Biggest Stars" www.bellaonline.c...

A stellar celebrity in our midst | Astro Bob

astrobob.areavoices.com

Comparison between the Sun, Arcturus (a red giant) and Antares (a red supergiant). Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

Trapezium cluster in the Orion nebula. The four brightest stars form a trapezium shape. The very brightest star of them is Theta1 Orionis C, which is actually a close binary. (Credit: John Bally, Dave Devine, and Ralph Sutherland, STScI, NASA) Mona Evars" www.bellaonline.c...

Trapezium (Theta1 Orionis)

daviddarling.info

Classification of Stars. At the top of this diagram are the Main Sequence stars, those using hydrogen as their nuclear fuel. The Sun is a G-type star, so you can compare that to the rare O-type stars to see the difference in size. And the difference in mass can be up to 100 times. Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

The Classification of Stars

atlasoftheuniverse.com

Zooming in from the Tarantula Nebula to the R136 cluster, with R136a1/2/3 visible as the barely resolved knot at bottom right. The brightest star just to the left of the cluster core is R136c, another extreme massive WN5h star. (Credit: European Southern Observatory/P. Crowther/C.J. Evans) Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

File:RMC136 cluster.jpg - Wikimedia Commons

commons.wikimedia.org

Left to right: a red dwarf, the Sun, a blue dwarf, and R136a1. R136a1 is not the largest known star in terms of radius or volume, only in mass and luminosity. (Credit: ESO/M. Kornmesser) Mona Evans"How Big Are the Biggest Stars" www.bellaonline.c...

Size comparison of our Sun, a red dwarf, a brown dwarf, Jupiter & Earth. Stars with less mass than the Sun are smaller and cooler. Brown dwarfs have less than eight percent of the Sun's mass, so can't sustain nuclear fusion. These cool orbs are nearly impossible to see in visible light, but stand out when viewed in infrared. Their diameters are about the same as Jupiter’s, but they can have up to 80 times more mass and are thought to have planetary systems of their own. (Image credit: NASA)

Getting WISE About Nemesis - Astrobiology Magazine

astrobio.net

Procyon, the seventh brightest star in the sky and one of the vertices of the Winter Triangle. It's one of our nearest neighbors at just over 11 light years away in the constellation Canis Minor. Procyon is a binary star system, composed of a white main sequence star and a white dwarf star.

The nearest stars, their distances in light-years, spectral types and known planets. Only 9 of the stars within 15 light years can be seen with the unaided eye from Earth. (Credit: Karl Tate / Source: NASA)

The Nearest Stars to Earth (Infographic)

space.com

Relative star sizes and photospheric temperatures. Any planet around a red dwarf, such as the one shown here, would have to huddle close to achieve Earth-like temperatures, probably inducing tidal lock. (Credit: MPIA/V. Joergens) Mona Evans, "Do Red Dwarfs Live Forever?" www.bellaonline.c...

How many red dwarfs are there? (credit: Jonathan O'Callaghan) Mona Evans, "Do Red Dwarfs Live Forever?" www.bellaonline.c...

PSR B1509-58. The nebula is about 150 light years in size, but at the center is an incredibly dense object 12 miles in diameter, a pulsar. Its powerful magnetic field and rapid spin make it a rich X-ray source. A pulsar is a rapidly spinning neutron star, the remnant of a massive star which ended its life in a supernova explosion. (Image: Chandra X-ray Observatory)

Chandra :: Photo Album :: PSR B1509-58 :: April 3, 2009

chandra.harvard.edu

Circinus X-1, an X-ray binary. Composite imagine with X-rays in blue and radio emission in purple, overlaid on an optical field of view. This type of binary star contains a neutron star. (Image credit: X-ray: NASA/CXC/Univ. of Wisconsin-Madison/S. Heinz et al; Optical: DSS; Radio: CSIRO/ATNF/ATCA)

X-ray Binary Circinus X-1

nasa.gov

A Hubble Space Telecope picture of globular cluster IC 4499. The new observations showed that it is about 12 billion years old, contrary to previous observations showing a puzzling young age. Credit: European Space Agency and NASA

Gamma Arietis (Mesarthim). It looks like a single star, but even a small telescope shows a pair of bright white stars like two strange eyes or a pair of headlights. (Credit: Dr. F. Ringwald/Cal. State Univ. Fresno) Mona Evans, "Aries the Golden Ram" www.bellaonline.c...

What’s outside Leona’s window? | Astro Bob

astrobob.areavoices.com

The head of Aries: Hamal (α Arietis), Sheratan (β Arietis) and Messartim (γ Arietis). These are the three brightest stars of the constellation - Hamal is of the 2nd magnitude. Messartim can be seen in small telescopes as a double star. Robert Hooke in 1664 first identified it as such. (There is also a third star that orbits the pair.) Mona Evans, "Aries the Golden Ram" www.bellaonline.c...